Building and Construction Law in NSW: The Complete Overview
Key Takeaways
Building and construction law in NSW operates on three layers at once — statute, contract and general law — and most disputes turn on which layer governs the problem.
The statutory framework is split across several instruments and several regulators, and knowing which one applies is the first analytical step in any matter.
Since Pafburn, a builder or developer that delegates or entrusts construction work to others cannot apportion its liability for breach of the statutory duty of care. In Kapila, a first-instance decision, Richmond J treated the Court of Appeal's broader reasoning as binding and held that the claims before him could not be apportioned whether or not the work was delegated — a position an appellate court or Parliament may yet revisit.
Most matters reach one of four destinations: NCAT, a court, a statutory determination, or a negotiated outcome. The route usually matters more than the argument.
This guide states NSW law as at 3 November 2026. Legislation passed in August 2026 will, once proclaimed, move the statutory duty of care and the certifier regime into a new Act — see the reform watch below.
Table of Contents
Introduction
An unlicensed contractor can finish a job and still be unable to recover the agreed price. A subcontractor with a sound claim can lose it because a notice was given after the contractual time bar expired. And since the High Court's decision in Pafburn, a builder that delegated the work can be ordered to pay the whole of a loss that others helped to cause. None of those outcomes turns on who was right. Each turns on which of the regimes that make up building and construction law in New South Wales governs the problem.
The statutory regimes are the spine of the field — licensing, statutory warranties, a duty of care, payment, safety, planning and insolvency are the seven that arise most often, and each has its own instrument, its own regulator and its own remedies. But they are not the whole of it. This guide also covers the contract that allocates risk, the insurance and security for performance that hold that risk, the Australian Consumer Law that polices conduct, and the general law that fills the gaps. The three layers — statute, contract and general law — are explained in the next section.
This overview is the map. It sets out how the framework is structured, what each part of it governs, and which of our detailed guides answers the question you are actually asking. If you already know your question, start with the table below.
Start here: find your question
Your question | Where it is answered |
What terms will decide my dispute, and how does this contract allocate risk? | |
How do I claim for a change to the work, and what notices must I give? | |
The project is late. Who is entitled to an extension, and can damages be deducted? | |
I am not being paid, or I have been served with a payment claim. What are my statutory rights and deadlines? | |
My head contractor has not paid me and is in trouble. Can I reach the principal? | Subcontracting and the chain of responsibility (below); The Definitive Guide to Security of Payment Laws and Adjudication in New South Wales |
The work is defective. What can be recovered, and by whom? | |
The designer, builder or developer is being sued for economic loss. What duty applies? | |
My licence is under threat, or I have received a show cause notice | Disciplinary action and licence suspension (below); The Definitive Guide to NCAT and the Building Commission in NSW |
There has been a serious incident on site | Work health and safety (below) |
A security call, retention or bank guarantee is in dispute | Security for performance in construction (below) |
I need to notify an insurer, or a claim has been declined | Insurance and risk transfer (below) |
Which forum will decide my dispute, and what will it cost? | |
The other party is failing financially, or I have been served with a statutory demand | |
I need to end the contract | |
I own, or am buying into, a strata apartment. What is the building bond scheme? | The strata building bond and inspections scheme (below) |
Building Commission NSW has made a prohibition, stop work or rectification order on my project | Residential apartment buildings: the RAB Act and Building Commission enforcement (below) |
If your question is not listed, read on: the sections below take each layer of the framework in turn.
How building and construction law in NSW is structured
The three layers: statute, contract and general law
The statutory layer is what the Parliament requires. It includes the licensing regime, the warranties implied into residential contracts, the duty of care owed by those who carry out construction work, the minimum entitlements to progress payment, and the safety obligations that attach to everyone who runs a business on a site. Statutory obligations apply whether or not the contract mentions them, and a contract that purports to exclude them is void to that extent: Home Building Act 1989 (NSW) (HB Act) s 18G for the statutory warranties, Building and Construction Industry Security of Payment Act 1999 (NSW) (SOP Act) s 34 for the payment regime, and Design and Building Practitioners Act 2020 (NSW) (DBP Act) s 40 for the statutory duty of care. Section 7E of the HB Act is framed differently: it makes an inconsistent term unenforceable to the extent of the inconsistency.
The contractual layer is what the parties agreed. It governs scope, price, time, risk allocation, notice requirements, and the processes for claiming and disputing. In construction, the contract does more work than in most industries, because the projects are long, the events are numerous and the parties need a mechanism for dealing with change. The terms that decide disputes most often are collected in our guide, Construction contracts in NSW: key terms and risks.
The general law layer is what the courts supply where neither the statute nor the contract answers the question. It includes the law of contract formation and construction, the doctrines of repudiation and waiver, negligence, estoppel, and the rules about when a party can end an agreement.
Who regulates what
Regulation is divided by subject rather than by project, so a single incident can engage two or three regulators at once, and their processes do not pause for each other.
Subject | Regulator or decision-maker | Main instruments |
Contractor licensing, certifier and practitioner registration, building compliance, and prohibition, stop work and rectification orders | Building Commission NSW, which took over these functions from NSW Fair Trading progressively from 1 December 2023 | Home Building Act 1989 (NSW); Design and Building Practitioners Act 2020 (NSW); Building and Development Certifiers Act 2018 (NSW); Residential Apartment Buildings (Compliance and Enforcement Powers) Act 2020 (NSW) |
Home Building Compensation Fund cover | icare (HBCF) | Home Building Act 1989 (NSW) Pt 6 |
Security of payment compliance | Building Commission NSW, which does not recover money owed; payment disputes go to adjudication | Building and Construction Industry Security of Payment Act 1999 (NSW) |
Work health and safety | SafeWork NSW | Work Health and Safety Act 2011 (NSW) |
Pollution, waste and contamination | NSW Environment Protection Authority and local councils | Protection of the Environment Operations Act 1997 (NSW) |
Development consent and its conditions | The consent authority (usually the local council), with third-party enforcement in the Land and Environment Court | Environmental Planning and Assessment Act 1979 (NSW) |
Companies, directors and insolvency | ASIC and the courts | Corporations Act 2001 (Cth) |
Residential building disputes | NCAT (Consumer and Commercial Division) | Home Building Act 1989 (NSW); Civil and Administrative Tribunal Act 2013 (NSW) |
The regulators investigate compliance, issue notices and prosecute breaches. None of them decides who owes whom money: that belongs to NCAT, the courts or an adjudicator.
Why the structure decides most disputes
The layers do not produce the same answer, and the differences are where matters are won and lost.
A builder answering a homeowner's defects complaint faces a statutory warranty claim that does not depend on what the contract says. A subcontractor chasing a payment has a statutory entitlement that bypasses the contract's payment terms. A designer sued for economic loss may face a duty that applies irrespective of any contract at all. And a developer sued in negligence may find that defences available in an ordinary claim are unavailable in a statutory one.
Identifying the layer, and therefore the regime, is the first step in any construction matter. It determines the standard that applies, the evidence that proves it, and the forum that decides it. If you need that analysis done on your own matter rather than explained, our construction law advice team can do it.
Five common misconceptions
Five beliefs about building and construction law in New South Wales are widely held, and each is wrong in a way that changes what a party should do.
The first is that a written contract determines the parties' rights. It determines some of them. The statutory warranties are implied regardless of what the contract says, and the statutory duty of care is owed to people who are not parties to the contract at all. A party that reads only the contract has read part of the position.
The second is that the regulator resolves disputes. Building Commission NSW, SafeWork NSW and the EPA investigate compliance, issue notices and prosecute breaches, but they do not determine who owes whom money. That belongs to NCAT, the courts or an adjudicator, and a complaint to a regulator does not pause the periods that apply to a civil claim.
The third is that a payment dispute is a contractual dispute. Where the statutory payment regime applies, it operates independently of the contract, on its own timetable, and produces an enforceable interim answer. Treating a payment claim as ordinary correspondence is the most common way parties lose the benefit of the regime.
The fourth is that only the person who did the work answers for it. A non-delegable duty means a party cannot discharge its obligation by engaging someone else to perform it, so a builder cannot answer a claim by pointing to its subcontractor, and a developer cannot answer by pointing to the builder.
The fifth is that being right is enough. In this field the instrument, the notice period and the forum decide as much as the merits, and a claim that is substantively sound but made in the wrong forum, after the period has expired, or without the notice the contract required, may not be heard at all. The framework rewards a party that identifies all three before it acts.
Practice point: the first 48 hours. When a construction problem surfaces — a payment claim, a defects complaint, a show cause notice, a statutory demand or a site incident — five steps protect the position before anything else is decided:
Identify every document that has been served, the date it was served and the process it belongs to.
Diarise every period running against you, starting with the shortest; several run in business days, and a notifiable safety incident must be reported immediately.
Preserve the record: site diaries, photographs, programme updates, correspondence and notices.
Notify your insurers in writing if the circumstances might give rise to a claim, and do not admit liability or agree a compromise without them.
Do not rectify, demolish or alter disputed work until it has been documented, and take advice before serving any notice of termination.
The regulatory framework for building work
The Home Building Act 1989 (NSW)
The HB Act is the foundation of residential building regulation in the State. It establishes the licensing regime for contractors and trades, implies statutory warranties into contracts for residential building work, requires certain contracts to be in writing and to contain prescribed particulars, mandates insurance in defined circumstances, and gives the Consumer and Commercial Division of the NSW Civil and Administrative Tribunal (NCAT) jurisdiction over the building disputes that arise, for claims up to $500,000 (s 48K(1)). The writing requirements apply above amounts prescribed by reg 5 of the Home Building Regulation 2014 (NSW) (HB Regulation): $20,000 for a contract under s 7(1)–(2) of the HB Act, and $5,000 for a small-jobs contract under s 7AAA.
Three of its features shape most residential matters. The licensing requirement means that an unlicensed contractor is not merely in breach of the contract but in breach of the statute, which affects whether payment can be recovered at all (s 10(1)(a) of the HB Act). The written-contract requirement means that an agreement that is not in writing, or that does not sufficiently describe the work, is unenforceable by the person who failed to comply (s 10(1)(b)), although that person may still be able to recover a reasonable sum for the work on a restitutionary basis — the principle recognised by the High Court in Pavey & Matthews Pty Ltd v Paul [1987] HCA 5; (1987) 162 CLR 221. The HB Act now confines that remedy in one respect: for uninsured work, s 94(1) denies the contractor recovery under any other right of action, including a quantum meruit (a claim for a reasonable sum for the work done), and s 94(1A) permits recovery on a quantum meruit basis only where a court or tribunal considers it just and equitable. And the warranty regime supplies terms the parties did not negotiate.
The statutory warranties and who can rely on them
Section 18B of the HB Act implies warranties as to residential building work into every contract to do that work. The warranties are that the work will be done with due care and skill and in accordance with the plans and specifications set out in the contract (s 18B(1)(a)); that materials supplied will be good and suitable for the purpose for which they are used and, unless the contract states otherwise, new (s 18B(1)(b)); that the work will be done in accordance with, and will comply with, the HB Act and any other law (s 18B(1)(c)); that the work will be done with due diligence and within the time stipulated in the contract, or within a reasonable time if no time is stipulated (s 18B(1)(d)); that work on a dwelling will result in a dwelling reasonably fit for occupation to the extent of the work (s 18B(1)(e)); and that the work and materials will be reasonably fit for a purpose or result the owner made known, so as to show reliance on the contractor's skill and judgment (s 18B(1)(f)).
Two features stand out in practice. The warranties are implied, so they exist even where the written contract is silent or attempts to displace them. And they run in favour of the owner and successors in title for a period (s 18D(1) of the HB Act, and see s 18C for the immediate successor of an owner-builder, licence holder or developer and s 18D(1A) for non-contracting owners), which means a subsequent purchaser may be able to rely on a warranty given to the original owner.
The warranty regime is the reason residential defects claims are more straightforward than commercial ones. The claimant does not have to prove a negotiated term was breached; the standard is supplied by the statute. The detail — what each warranty covers, the periods that apply, and who may claim — is dealt with in our guide, NSW building defects, warranties, duty of care and claims.
NSW contractor licences and unlicensed contracting
Licensing is the gate through which residential building work must pass. A person who contracts to do residential building work, or who advertises or holds out as willing to do it, is generally required to hold a NSW contractor licence (s 4(1) of the HB Act; s 5 extends the requirement to advertising and holding out). Specific trades are separately licensed (s 12; ss 13–15C).
The consequences of non-compliance go beyond a penalty: an unlicensed person cannot recover the agreed price for the work (s 10(1)(a) of the HB Act). That commercial consequence of a regulatory failing is the reason licence checks — including verifying that each subcontractor holds the licence its work requires — are a routine step before engaging a contractor rather than after something goes wrong. The regulator's enforcement powers and the complaint process are set out in our guide, The Definitive Guide to NCAT and the Building Commission in NSW.
Disciplinary action, show cause notices and licence suspension
Licensing is enforced as well as granted. Disciplinary action against a licence holder is taken under Part 4 of the HB Act by the Secretary, in practice through Building Commission NSW. The process usually begins with a written notice to show cause why the holder should not be dealt with, which must state the grounds and allow at least 14 days for oral or written submissions and evidence (s 61). That response is the licence holder's main opportunity to shape the outcome. The outcomes available range from a caution or reprimand to a monetary penalty of up to $11,000 for an individual or $50,000 for a corporation, the imposition of conditions, suspension or cancellation of the licence, and disqualification (s 62(1)). A refused licence application can be reviewed by NCAT (s 83B(1)); review rights against a disciplinary decision should be checked as soon as the decision is received.
Two related obligations sit alongside the licence. A contractor must not do residential building work above the prescribed amount, or demand or receive payment for it, unless Home Building Compensation Fund cover is in force and a certificate of insurance has been given to the owner (s 92(1)–(2) of the HB Act), so a contractor that loses its eligibility for cover can be stopped from contracting for that work. And a licence covers only the categories of work it authorises, so a contractor that performs work outside its licence categories is exposed even though it holds a licence.
Practice point: treat a show cause notice as the start of a contested process, not a request for information. Respond within the time it allows, support the response with evidence, and take advice on whether an undertaking or a rectification proposal should form part of it.
The Design and Building Practitioners Act 2020 (NSW)
The DBP Act introduced a registration regime for design practitioners and building practitioners, compliance requirements for regulated designs, and a statutory duty of care owed by persons who carry out construction work to avoid economic loss caused by defects.
That duty is dealt with separately below, because its interaction with other causes of action is the subject of the most important recent decision in this field.
Registration of certifiers
Certifiers occupy a distinctive position. They are privately engaged but exercise a public function, and they are registered and regulated under the Building and Development Certifiers Act 2018 (NSW) (BDC Act), which prohibits a person from carrying out certification work unless registered in a class that authorises that work (s 5(1)) and prohibits a false representation of registration (s 5(3)). Their role includes issuing construction certificates and occupation certificates, inspecting work at defined stages, and determining whether work complies with the requirements.
The significance for building law is that certification is a point at which liability can shift. A certifier who issues a certificate improperly may be exposed to a claim, and a developer or builder who relies on a certificate that should not have been issued may find that reliance is no defence to a claim by the owner. The scope and limits of certifier liability remain one of the more actively litigated areas of construction law in the State.
Occupation certificates are the practical end point of the certification system. Under the EP&A Act, a person must not commence occupation or use of a new building unless an occupation certificate has been issued for it (s 6.4); the principal certifier issues the certificate (s 6.6), and the certificate authorises the occupation and use of the building (s 6.7). What it certifies is limited: the certifier's satisfaction of the matters the EP&A Act and the regulations require, not that the building is free of defects. The issue of an occupation certificate does not extinguish the statutory warranties, the statutory duty of care, or any contractual right.
Residential apartment buildings: the RAB Act and Building Commission enforcement
The Residential Apartment Buildings (Compliance and Enforcement Powers) Act 2020 (NSW) (RAB Act) gives Building Commission NSW a separate set of enforcement powers over residential apartment building work. The regime begins before completion: the developer must notify the Secretary (in practice, Building Commission NSW) of the expected date of the occupation certificate application at least 6 months, but not more than 12 months, before that application is made (s 7(1)), or within 30 days of commencing work where completion is expected in less than 6 months (s 7(3)), and any change to that date must be notified (s 8). The notice is what allows the Commission to inspect and intervene before the building is occupied.
The central tool is the prohibition order (s 9). The Secretary (in practice, Building Commission NSW) may make a prohibition order where, among other grounds, the expected completion notice was not given or was given late, the Secretary is satisfied that a serious defect exists in the building, or a required rectification bond has not been provided; while the order is in force, an occupation certificate must not be issued and a strata plan for the building must not be registered. The effect is practical and severe: the project cannot be certified, settled or traded until the order is dealt with. Appeals lie against prohibition orders (s 10).
The Commission may also require defects to be fixed and work to stop. A building work rectification order may be given to the developer requiring specified work to be brought to the required standard within the period the order sets (Pt 5, s 33), with provision for the standards the work must meet, notice, modification and the period for compliance (ss 34–39), and the Secretary may carry out the work and recover the cost where the order is not complied with (s 42). A stop work order halts work that involves a risk of harm (s 29), with appeals (s 30). These powers are supported by information-gathering and entry powers (Pt 3, ss 17–24), and the orders the Commission makes are recorded in a public register (s 62).
These are regulatory powers, and they run alongside the private routes — they do not replace them. A building work rectification order does not settle an owner's warranty claim or a claim under the s 37 duty, and compliance with an order is not a release; equally, a homeowner's complaint to the Commission (see When a homeowner complains, below) can produce an order whose existence and contents become part of the record in the civil dispute — a building work rectification order may itself be used in later proceedings (s 43). A developer served with a proposed order should use the natural justice steps built into Pt 5, Div 2, while keeping the private claim's time limits in view.
Building products, combustible cladding and use bans
The Building Products (Safety) Act 2017 (NSW) gives the Secretary power to ban an unsafe use of a building product (s 10). A building product use ban prohibits the supply of a product, or its use in connection with a building, in the terms the ban specifies, and it remains in force until it is revoked or suspended (s 12). The best known ban, made in 2018, prohibits the use of certain aluminium composite panels with a high polymeric core content in external cladding and related uses on the classes of buildings the ban specifies.
The consequences of a use ban run wider than prosecution. Supplying a banned product, or causing it to be used, in connection with a building is an offence, with maximum penalties reaching $1.1 million for a corporation (s 15). A ban also feeds the private claims: the HB Act warranty requires work to comply with the law (s 18B(1)(c)), the s 37 duty is measured against the same standards, and a certifier cannot properly certify work that uses a banned product. An owner left with a banned product in the building faces the cost of rectification, and the ban itself becomes the compliance benchmark a court or tribunal applies.
The EP&A framework adds a registration regime. The Environmental Planning and Assessment (Development Certification and Fire Safety) Regulation 2021 (NSW), Pt 14, requires buildings with external combustible cladding — class 2, 3 and 9 buildings within the Regulation's definitions — to be registered on the NSW register, which Building Commission NSW uses to target its cladding audit and enforcement work. Registration is the owner's obligation, and it is not a substitute for rectification.
For defects claims, unsafe building products change the arithmetic in two ways. The duty under s 37 of the DBP Act already reaches the manufacture and supply of building products (s 36 of the DBP Act), so a supplier may answer the same loss as the builder, and the ban supplies a standard that owes nothing to the contract. And the products identified in a bond-scheme inspection report (see The strata building bond and inspections scheme, below) or a Commission investigation are often the same products a defects expert later blames — the regulatory record and the civil claim read each other.
The duty of care and proportionate liability after Pafburn
The statutory duty of care
Section 37(1) of the DBP Act imposes a duty on a person who carries out construction work to exercise reasonable care to avoid economic loss caused by defects — in or in relation to the building, and arising from the construction work. Section 39, headed "Duty must not be delegated", gives the duty a non-delegable character: the person who owes it cannot discharge it by handing the work to someone else.
The practical significance of a duty owed outside contract is that it reaches a defendant who has no contractual relationship with the claimant. A subsequent apartment owner, an owners corporation, and a later purchaser can each be a claimant (s 37(2) of the DBP Act), where the contractual chain would otherwise shut them out.
That reach is the point of the provision. In Brookfield Multiplex Ltd v Owners Corporation Strata Plan 61288 [2014] HCA 36, the High Court held, on the facts of a serviced apartment development built under a detailed design and construct contract and sold with express defect protections, that the builder owed the owners corporation no common law duty of care to avoid pure economic loss from latent defects in the common property: the subsequent owners were not vulnerable, and neither, as their statutory agent, was the owners corporation. Section 37 of the DBP Act now supplies, by statute, a duty of the kind the general law declined to recognise on those facts. It does not displace Bryan v Maloney [1995] HCA 17; (1995) 182 CLR 609, which remains authority for a builder's duty to the subsequent purchaser of a dwelling built under a simple contract.
The Court of Appeal has given the duty a broad operation. In Roberts v Goodwin Street Developments Pty Ltd [2023] NSWCA 5, it held that the duty is not confined to residential apartment buildings and that it operates retrospectively in the circumstances the DBP Act prescribes: Sch 1 cl 5 extends the duty to construction work carried out before s 37 commenced, but only where the loss first became apparent within the 10 years before that commencement or becomes apparent afterwards.
Why the duty is non-delegable
A non-delegable duty is one the performer cannot discharge by engaging someone else to do the work carefully. The duty is to ensure that reasonable care is taken, not merely to take reasonable care in selecting others.
That characterisation does substantial work. It prevents a builder from answering a claim by pointing to the subcontractor who did the work, and it prevents a developer from pointing to the builder. Each of them owes the duty directly, and each of them must answer for the result.
What the High Court decided
The question that reached the High Court was whether a defendant sued for breach of that duty could rely on proportionate liability — the statutory scheme that allows liability to be apportioned between concurrent wrongdoers according to their responsibility.
In Pafburn Pty Limited v The Owners - Strata Plan No 84674 [2024] HCA 49, the High Court answered no, by a majority of four to three, and dismissed the appeal from The Owners – Strata Plan No 84674 v Pafburn Pty Ltd [2023] NSWCA 301. The majority held that a builder or developer which delegates or entrusts construction work to others cannot rely on the proportionate liability provisions in Part 4 of the Civil Liability Act 2002 (NSW) (CLA) to reduce its liability for breach of the duty. That builder or developer may pursue contribution from others by cross-claim, but it cannot reduce the claimant's recovery at first instance. The majority's reasons turn on delegation or entrustment. "Substantive control" is a separate concept: it is the statutory language of s 36(1)(d) of the DBP Act, which brings within the duty a person who is supervising, coordinating, project managing or otherwise having substantive control over construction work.
The majority's reasoning was confined to defendants who delegate or entrust work. It left open whether a party that carries out the work itself — commonly a subcontractor or a consultant engaged for a discrete task — may still apportion. The Court of Appeal had gone further, holding that Part 4 of the CLA does not apply to a claim under section 37 of the DBP Act at all. In Kapila v Monument Building Group Pty Ltd [2025] NSWSC 1306, Richmond J treated that part of the Court of Appeal's reasoning as part of the binding reasoning (the ratio) of that decision, binding on him and undisturbed by the High Court, and held that the claims before him could not be apportioned whether or not work had been delegated. That is a first-instance decision, and the question may yet be revisited by an appellate court or by legislation.
The High Court's decision, and the cases applying it, are analysed in full in our guide, The statutory duty of care under the Design and Building Practitioners Act 2020 (NSW) after Pafburn.
What it changes for builders, designers and developers
On the law as it currently stands in New South Wales, three consequences follow for anyone who carries out construction work.
A defendant cannot reduce its exposure by identifying other parties who also failed. The apportionment mechanism that exists in ordinary negligence claims is not available against a claim founded on this duty. A claimant may therefore recover in full from one defendant, leaving that defendant to pursue contribution separately if it can.
The incentive to identify and join other responsible parties changes. Where apportionment is unavailable, the tactical pressure moves to proving that the duty was not breached at all, or that the loss was not caused by the breach, rather than to sharing the liability.
And the exposure of parties low in the contractual chain increases. The duty is owed directly by each person who carries out construction work. Kapila itself concerned a builder and its supervising director, who argued they had delegated nothing; it did not decide a claim against a subcontractor or consultant. What follows for such parties is an inference from the Court of Appeal's reasoning as Kapila applied it: if that reasoning continues to be followed, a subcontractor or consultant that performs its own work cannot apportion its liability either. These decisions therefore matter most to subcontractors and to consultants who assumed their exposure was limited by their position on the project.
Example: An owners corporation sues the developer, the builder and the waterproofing subcontractor under s 37 of the DBP Act for defects in a residential apartment building. The builder's evidence is that the subcontractor caused most of the loss. Because the builder entrusted the waterproofing to the subcontractor, Pafburn prevents it from apportioning: it may be ordered to pay the full amount and left to recover from the subcontractor by cross-claim. If the reasoning applied in Kapila continues to be followed, the subcontractor cannot apportion either. Each defendant's real defences are that it did not breach the duty, that its breach did not cause the loss, or that the claim is out of time — and the evidence for each needs to be assembled early.
Facing a claim under s 37 of the DBP Act? With apportionment off the table, the defence turns on breach, causation, timing and cross-claims. Our construction law advice team acts for builders, developers, subcontractors and consultants defending claims under the statutory duty.
Reform watch (as at 3 November 2026): The Building (Approvals and Practitioners) Act 2026 (NSW) passed Parliament in August 2026 and received assent on 14 August 2026. Apart from two items relating to Crown prefabricated building work (Sch 3[20] and [45]), which commenced on assent, it commences on a day or days to be appointed by proclamation (s 2), and Building Commission NSW has said the reforms will take effect once the supporting regulations are developed, with industry consultation during 2026 and 2027. On commencement it will consolidate the certification and practitioner registration regimes now found in the DBP Act and the BDC Act, and re-enact the statutory duty of care in Part 8 of the Building (Approvals and Practitioners) Act 2026 (NSW) in substantially its existing form. Manufacturers and suppliers of building products remain within the duty, as they already are under s 36 of the DBP Act, and the duty's reach for prefabricated and modular building work will depend on regulations yet to be made. The existing duty is expected to continue to govern work completed before commencement; check the transitional provisions before relying on either Act. Separately, the Fair Trading and Building Legislation Amendment Act 2026 (NSW), which also received assent on 14 August 2026, amends a wide range of property and building legislation, including to give NSW Fair Trading and Building Commission NSW clearer powers to refuse applications for, or cancel, licences obtained through misrepresentation, error or invalid qualifications, and to cancel a single authority on a licence rather than the whole licence. Some of its amendments commenced on assent and others commence on proclamation, so confirm that the licensing amendments are in force before relying on them. As at 3 November 2026, the supporting regulations for the new Act have not been made and no appellate decision has revisited Kapila, which remains a first-instance decision. Since Kapila, first-instance decisions have continued in the same direction, including on the width of the duty owed by developers and head contractors; nothing in them disturbs the Pafburn majority's distinct treatment of delegation and entrustment on the one hand and substantive control under s 36(1)(d) of the DBP Act on the other.
Construction contracts
Standard forms and bespoke agreements
Almost every construction contract in New South Wales begins from a standard form and is then amended. The AS 4000-1997 general conditions are used for construct-only work; AS 4902-2000 is the design and construct equivalent; AS 2124-1992 remains on older projects; and GC21 is the New South Wales Government's form for public works. Bespoke agreements exist, particularly on large developments, but they are usually drafted against one of these forms and borrow its structure.
The form is not background. It decides the definition of the events that matter, the notice requirements that govern claims, the allocation of risk between the parties, and the machinery for resolving disputes. Two contracts for the same building, on different forms, produce different answers to the same question. The first step in any contractual analysis is therefore to identify the form and read the amendments that sit behind it.
There is one point that carries across every form. A construction contract is a long instrument for a long project, and its processes have to be operated while the work continues. The parties who do well in construction disputes are usually the ones who ran the contract's machinery as the project proceeded, rather than the ones who reconstructed it afterwards. The terms that decide disputes most often, and the way they operate in practice, are set out in our guide, Construction contracts in NSW: key terms and risks.
The clauses that decide disputes
Seven groups of clauses decide the majority of construction disputes.
Scope and design responsibility determine who must produce what, and who bears the consequence where the design does not work. Price and payment mechanisms determine what is payable, when, and on what evidence — including whether payment is by lump sum, by schedule of rates, or by remeasurement. Time and programme clauses determine when completion is due and what happens when it slips. Notice and time bar clauses determine whether a claim survives at all. Risk allocation clauses, including indemnities and insurance obligations, determine who carries defined losses. Security clauses determine what the principal may call on and when. And dispute resolution clauses determine the route a dispute must take before it reaches a court or NCAT.
The group that surprises parties most often is the notice group, because a claim notified outside a contractual time bar may be lost regardless of its merits. How time bars operate, and the habits that manage them, are dealt with under records, notices and time limits below.
Variations and time bars
A variation is a change to the work, the time or the price that the contract authorises. Construction projects cannot proceed without them, because the design develops, the ground conditions differ from the assumption, and the client changes its mind. The contractual question is not whether a variation occurred but whether it was instructed or claimed in the form the contract requires, within the time the contract allows.
Most contracts distinguish between a direction and a claim. A direction to change the work binds the parties when given by the person with authority to give it. A claim for additional time or money must be made in the form and within the period the contract requires, and often must be supported by the records the contract specifies. Where the contract contains a time bar clause, a variation claim made outside the period may be defeated even where the entitlement was clear.
How a change must be notified, what records must support it, and when a time bar defeats an otherwise sound claim are worked through in our guide, Variations in construction contracts in NSW: procedure, time bars and variation claim tactics.
Delay, extensions of time and liquidated damages
Delay is the most common source of construction disputes, and it is usually contested on two fronts at once. The first is whether the contractor is entitled to an extension of time, which depends on whether a relevant event occurred, whether it was critical to completion, and whether the claim was made in time. The second is whether the principal is entitled to deduct liquidated damages, which depends on whether completion was achieved by the date as extended.
The two questions are connected. Where an extension of time is due but has not been granted, a deduction of liquidated damages made while the claim is unresolved is exposed to challenge. And where the contract's extension machinery has a time bar, an unclaimed extension may convert into a liquidated damages entitlement for the principal.
The analysis of delay events, float, concurrency and the records that support an extension claim is set out in our guide, Delay and disruption claims in NSW, and the operation of the deduction itself is dealt with in our guide, Liquidated damages in a New South Wales construction contract.
Practical completion, the superintendent and the defects liability period
Three contractual concepts sit at the centre of most completion disputes. Practical completion is the stage, as the contract defines it, at which the works are complete except for minor defects and omissions that do not prevent their use. These consequences come from the contract, not from statute: under most standard forms, practical completion stops liquidated damages accruing, passes possession of the works to the principal, triggers a release or reduction of security, and starts the defects liability period. Whether and when it was reached is therefore often worth more than any single variation.
The superintendent, or contract administrator, is the person the contract appoints to direct, assess and certify — including progress certificates, extensions of time and practical completion. Although engaged by the principal, a superintendent acting as certifier is expected to act honestly and fairly; under AS 4000 (cl 20), the principal must ensure that the superintendent does so. That obligation comes from the contract, so check whether it has been amended. A progress certificate that under-values the work can be challenged under the contract, and the contractor may also serve a payment claim under the SOP Act.
The defects liability period is a contractual period, commonly 6 or 12 months depending on the contract, during which the contractor must return to rectify notified defects. It is not a limit on liability. The statutory warranty periods for residential work, the statutory duty of care and the general limitation periods continue to run whether or not the defects liability period has ended.
Ending a contract
A contract may end in three ways. It may be completed. It may be brought to an end by agreement, which is how most early endings actually occur. Or it may be terminated by one party relying on a right given by the contract, by the general law, or by statute.
Termination is the most consequential step available to a party short of commencing proceedings, and it is the step most often taken without the analysis it requires. The right has to come from somewhere, the notice has to satisfy the contract, the ground has to be evidenced, and the consequences for accrued rights, security and the works have to be worked through in advance. That analysis is set out in our guide, Terminate contracts: what to know to terminate construction contracts.
Payment and the statutory framework
The framework and its purpose
Payment in the construction industry is regulated by statute as well as by contract. The SOP Act gives a person who carries out construction work, or supplies related goods and services, a statutory entitlement to progress payments and a procedure for enforcing it.
The purpose of the regime is cash flow. It operates quickly, it is decided on written submissions (usually without a hearing), and it produces an interim determination that is enforceable even where the underlying dispute has not been finally resolved. That is why it is described as a pay-now, argue-later regime. It is also why it does not replace the contract: the contract still governs the final position, and the statutory determination is an interim step.
The framework applies to “construction contracts” within the meaning of the statute, which is a wider class than many parties assume. Whether a particular arrangement is within it determines whether the statutory rights are available at all, and that question is often the first one to answer when a payment problem arises. Our guide, The Definitive Guide to Security of Payment Laws and Adjudication in New South Wales, deals with the scope of the regime and the way it interacts with the contract.
Payment claims, payment schedules and timing
The statutory process runs on dates. For construction contracts entered into on or after 21 October 2019, a payment claim may be served on and from the last day of the named month in which the work was first carried out, and on and from the last day of each later named month, unless the contract provides for an earlier date; where the contract has been terminated, a claim may be served on and from the date of termination (s 13(1A)–(1C) of the SOP Act). The claim must also state that it is made under the Act (s 13(2)(c)). Contracts entered into before that date remain governed by the earlier regime, under which a valid claim depends on the existence of a reference date (Sch 2). A respondent that wishes to dispute the claim must provide a payment schedule within 10 business days after the claim is served, or any earlier time the contract requires (s 14(4)). A respondent that does not provide a schedule within that period loses the right to raise reasons it did not state, and may face a liability for the claimed amount.
For both parties, that has practical consequences. The date on which a claim is served determines the periods that follow, so service should be proved. The content of the payment schedule determines what the respondent may later argue, so a schedule is a document of substance rather than a formality. And the date from which a claim may be served depends on both the statute and the contract, so the contract's payment provisions have to be read before a claim is served — and, for a contract entered into before 21 October 2019, the existence of a reference date may decide whether the claim is valid at all.
The mechanics of claims and schedules, including the position under contracts entered into before the 2019 reforms, are set out in our guide, Navigating Payment Claims and Schedules in NSW.
Served with a payment claim? The period for a payment schedule starts on service, and a reason you leave out of the schedule cannot be raised later. Our security of payment advice team can review the claim and help prepare the schedule before the period expires.
The adjudication process
Where a payment claim is not paid in full, the claimant may lodge an adjudication application (s 17 of the SOP Act). When it must do so depends on whether the respondent provided a payment schedule and, if so, whether it paid the scheduled amount; the periods are set out in the time limits table below. An adjudicator is appointed, the respondent may provide an adjudication response if it gave a payment schedule in time (s 20(1), (2A)), and the adjudicator must determine the application within 10 business days after the response is lodged or the period for lodging one ends — or, where the respondent is not entitled to respond, after notice of the adjudicator's acceptance — unless the parties agree to more time (s 21(3)).
The process is deliberately compressed, and its limits follow from that. An adjudicator determines the amount payable on an interim basis, and the determination is binding until the dispute is finally resolved by litigation, arbitration or agreement. Reasons that were not raised in the payment schedule cannot be raised in the response (s 20(2B) of the SOP Act). And a jurisdictional error — broadly, an error that takes the adjudicator outside the limits of the adjudicator's power — may found an application to quash the determination, although the grounds for doing so are narrow: in Probuild Constructions (Aust) Pty Ltd v Shade Systems Pty Ltd [2018] HCA 4, the High Court held that a determination cannot be quashed for a non-jurisdictional error of law on the face of the record. Separately, s 32A of the SOP Act allows the Supreme Court, where a jurisdictional error affects only part of a determination, to set aside that part and leave the balance in place.
The process itself, the grounds on which a determination may be challenged, and the tactics that decide outcomes are dealt with in our guide, Adjudication in NSW explained: how to win or survive a security of payment claim.
Enforcing a determination
An adjudication determination is not a judgment, but the statute makes it enforceable as one (s 25(1) of the SOP Act). A determination may be filed in a court of competent jurisdiction and enforced as a judgment debt, which means the ordinary enforcement mechanisms become available without a fresh hearing on the merits.
That status has two effects. A party that has lost an adjudication cannot generally resist enforcement by re-arguing the merits (s 25(4) of the SOP Act), because the determination is binding for now, until the dispute is finally resolved. And a party that wishes to recover money paid under a determination it says was wrong must do so in separate proceedings (s 32(3)(b)). The distinction between the interim determination and the final position is the feature of the regime most worth understanding.
Example: A formwork subcontractor serves a payment claim on its head contractor at the end of the month, stating that it is made under the SOP Act. Ten business days pass without a payment schedule, and the due date for payment passes without payment. Within 20 business days after the due date, the subcontractor gives notice of its intention to apply for adjudication; the head contractor then has five business days to provide a schedule (s 17(2)), and when none arrives the subcontractor lodges its adjudication application within the following 10 business days (s 17(3)(e)). Because no schedule was given in time, the head contractor is not entitled to lodge an adjudication response at all (s 20(2A)). If the adjudicated amount is not paid, the subcontractor can obtain an adjudication certificate and file it as a judgment debt (ss 24(1)(a), 25(1)) and, if the head contractor is in difficulty, use the payment withholding and Contractors Debts Act 1997 (NSW) routes described under payment down the chain.
Retention money trusts
The SOP Act also reaches retention money. Section 12A permits the regulations to require retention money — money a head contractor retains out of amounts payable to a subcontractor, as security for the subcontractor's performance (s 12A(5)) — to be held on trust for the subcontractor entitled to it, and to require the head contractor to pay the money into a retention money trust account. The account is either an account established with a financial institution by the head contractor, or an account established and operated by the Small Business Commissioner (s 12A(1)–(2)). The Government's security of payment guidance on retention money is the practical starting point for the current requirements.
The Building and Construction Industry Security of Payment Regulation 2020 (NSW) makes those requirements mandatory for head contractors on construction contracts with a contract value of $20 million or more (Pt 2). The account must be separate and clearly identified as a trust account, and the retention money must be kept apart from the head contractor's own funds — commingling the money defeats the protection the trust is meant to give. Records of the account's operation must be kept: a separate ledger for each subcontractor showing deposits, withdrawals and balances, a copy of which must be given to the subcontractor at least once every three months (or as agreed in writing, but at least once every six months), with records retained for not less than 3 years after the account is closed (Regulation cl 16). Section 12A(3)(b) also allows the regulations to provide for inspection of those records by the Small Business Commissioner or the subcontractor. Neither the SOP Act nor the Regulation caps the percentage that may be retained — withholding of up to 5% of the contract price is market practice, and the contract governs.
Breach is enforced through penalties. A regulation made under s 12A may create an offence punishable by a penalty not exceeding 1,000 penalty units for a failure to comply with the trust requirements (s 12A(4)), and the SOP Act's penalty notice regime applies (s 34B). The trust is not discharged by the head contractor's insolvency: money held on trust is not the head contractor's property, which is the protection the regime is designed to give subcontractors on larger projects.
For head contractors, the obligations are compliance-critical: the account must be in place before retention is first withheld, the records must be kept as the Regulation requires, and the subcontractor's right of inspection means the account's operation is not a private matter. For principals and financiers, the point is that retention which is trust money is not an asset of the head contractor available on insolvency — a qualification on the security analysis set out under Security for performance in construction below.
Defects, warranties and claims
What counts as a defect
A defect is a failure of the work to meet the standard the contract or the statute requires. That standard is not the same as a difference of opinion about workmanship. It is measured against the contract's specification, the plans and approvals, the statutory warranties where they apply, and the standard a reasonable person would regard as acceptable for the kind of work in question.
In practice, defects fall into recognisable classes. Work that does not comply with the plans, specifications and statutory requirements. Work that is not done with due care and skill. Materials that are not good and suitable for the purpose for which they are used, or that are not new where the contract requires new materials. And work that is not reasonably fit for the purpose or result the owner made known (s 18B(1) of the HB Act). The classification matters, because the class determines which warranty or contractual term is engaged, who can claim, and what period applies.
Warranty periods and who may claim
Once a defect is identified, three questions follow: who is liable, who may sue, and how long the claim survives.
The person liable is usually the party that contracted to do the work, but a claim can also be brought against a designer or a certifier, and the statutory duty of care reaches parties with no contractual relationship to the claimant at all. The class of claimants is wider than the class of contracting parties, because a later purchaser of the dwelling, and an owners corporation in respect of common property, may each have an entitlement. And the time within which a claim may be brought is fixed by statute and by the general law: for residential work the warranty period is six years for a breach that results in a major defect and two years in any other case, running from completion (s 18E(1)(b)–(c) of the HB Act), with a further six months where the breach becomes apparent in the last six months of that period (s 18E(1)(e)). A civil action for loss arising from defective building work is also subject to an absolute long stop of 10 years from completion (Environmental Planning and Assessment Act 1979 (NSW) (EP&A Act) s 6.20(1)). The date of completion therefore matters as much as the date of discovery.
For commercial work there is no equivalent statutory warranty regime: the standard is set by the contract and the general law, and the claimant must establish it from the negotiated documents.
Proving a defect
A defect claim is an evidential exercise. The claimant has to establish what the required standard was, what the work actually is, and what it would reasonably cost to bring it to the required standard.
That last element reflects the ordinary measure of damages for defective building work, which is the cost of rectification, provided rectification is necessary to bring the work into conformity with the contract and is a reasonable course to adopt (Bellgrove v Eldridge [1954] HCA 36; (1954) 90 CLR 613).
Each of those elements is usually proved with expert evidence. The expert identifies the departure from the required standard, explains its cause, distinguishes between work that was defective when carried out and damage that has occurred since (the defect-versus-damage question), and gives an opinion on rectification cost. The timing of the instruction matters: an expert engaged after the work has been rectified by others is describing a building that no longer exists, and the opinion is correspondingly weaker. Photographs, inspection reports and the project's own records do much of the work, which is why they should be retained for longer than the project itself lasts.
Causation is the point at which most defect claims are won or lost. Establishing that the work is non-compliant is not the same as establishing that the non-compliance caused the loss claimed, and an expert opinion that does not address cause may be vulnerable to attack.
The Home Building Compensation Fund
Residential building work above the amount prescribed by the regulations must be covered by insurance under the Home Building Compensation Fund, the statutory insurance scheme provided through icare (s 92(1)–(3) of the HB Act), and the cover responds to defined events. Under s 99(1) the entitlement to cover arises where the contractor becomes insolvent, dies or disappears. A court or tribunal order that remains unsatisfied engages the scheme through two steps: the contractor licence is automatically suspended under s 42A, and s 101 deems that suspension to constitute the contractor's insolvency for the purposes of the contract of insurance, so a claim may then be made on the policy.
The scheme has two limits that claimants often miss. It is not a substitute for a claim against the builder; it responds in defined circumstances and is subject to limits. And it is time-sensitive, because the scheme responds to events within defined periods and to claims made within defined periods. Where a residential project has gone wrong, the availability of cover is often the difference between a recoverable claim and an unsecured one. The scheme and the process for claiming are explained in our guide, Your Guide to the Home Building Compensation Fund (HBCF) in NSW.
The strata building bond and inspections scheme
For residential apartment buildings, a bond scheme sits alongside the warranties. Part 11 of the Strata Schemes Management Act 2015 (NSW) requires the developer of an eligible strata scheme to give the Secretary a building bond before an application is made for an occupation certificate (s 207(1)). The scheme captures residential and multi-use buildings — including buildings with car parking, common areas and commercial or retail space — where the work is carried out for the purposes of registering the strata plan (s 191). It does not apply to work that must be covered by Home Building Compensation Fund insurance (s 191(3)); because that insurance is generally not required for buildings above three storeys, the scheme in practice applies to buildings of four or more storeys. The Government's scheme page describes the current process.
The bond is 2% of the contract price for the building work, or the percentage the regulations prescribe. The developer must arrange two inspections after completion by an approved building inspector: an interim inspection, with a report on the defects found, and a final inspection, which must be arranged no later than 18 months after completion (s 200), with the final report given before the end of the second year of the statutory warranty period. The inspection reports identify defects; they do not decide anyone's liability.
The bond is security for the owners corporation, not a damages entitlement. Where defects identified in an inspection report are not rectified, the Secretary may claim or realise the whole or part of the amount secured for payment to the owners corporation (s 209) so the defects can be fixed; where there are no defects, the bond is returned to the developer. Building Commission NSW administers the scheme, and the process runs through the government's online portals from lodgement to release.
The scheme interacts with, but does not displace, the private remedies. The statutory warranties supply the standard, the bond pays for rectification of what the inspections find, and a claim under the s 37 duty of care or the warranties may still be brought for losses the bond does not answer. A developer running the scheme's inspections should treat the reports as part of the defects record — the same documents a court or tribunal will later read.
Where disputes are decided
NCAT building disputes
The bulk of residential building disputes in New South Wales are determined by NCAT's Consumer and Commercial Division, which has jurisdiction over claims arising under the statutory warranties and over a range of consumer claims. NCAT's jurisdiction in a building dispute extends to claims of up to $500,000 (HB Act s 48K(1)); larger claims go to a court. The forum is designed for accessibility: proceedings are relatively informal, legal representation requires leave (Civil and Administrative Tribunal Act 2013 (NSW) (CAT Act) s 45(1)(b); Sch 4 cl 7), and each party ordinarily bears its own costs unless NCAT finds special circumstances warranting an order (s 60). In the Consumer and Commercial Division, r 38 of the Civil and Administrative Tribunal Rules 2014 (NSW) (CAT Rules) widens that position. Costs may be awarded without special circumstances where more than $30,000 is claimed or in dispute (r 38(2)(b)). They may also be awarded where the amount is between $10,000 and $30,000 and NCAT has made an order under Sch 4 cl 10(2) of the CAT Act — the order available where a party has caused another party disadvantage (CAT Rules r 38(2)(a)).
Those features shape strategy. The absence of an automatic costs entitlement reduces the financial risk of bringing a claim, but it also reduces the pressure a costs order can apply. And the procedural informality does not relieve a claimant of the need to prove the case, which is why expert evidence and a clear quantum calculation remain necessary. The jurisdiction, the process and the relationship with the regulator are set out in our guide, The Definitive Guide to NCAT and the Building Commission in NSW.
The courts
Commercial construction disputes generally proceed in the courts. The District Court hears general claims of up to $1,250,000 and has a dedicated construction list, and the Supreme Court hears the largest matters and applications for relief that only it can grant, including applications relating to adjudication determinations. Within the Supreme Court, the Equity Division maintains the Technology and Construction List for building, engineering and other disputes that turn on complex technical questions. Proceedings are entered in the List by summons supported by a List Statement, and they are case managed by the List Judge under Practice Note SC Eq 3 (issued on 26 February 2025 and commencing on 3 March 2025): timetable-driven directions hearings, referral of questions to a referee for inquiry and report, single or concurrent expert evidence, an electronic court book, and stopwatch hearings where suitable.
The choice between NCAT and a court is determined by the amount in dispute, the identity of the parties, and the nature of the relief sought. It is a decision with real consequences, because the forum determines the procedure, the evidence, the availability of representation, and the costs regime. Where that choice is live, the analysis in Resolving a Construction Dispute in New South Wales sets out the factors that bear on it.
NCAT (Consumer and Commercial Division) | District Court | Supreme Court | Adjudication (SOP Act) | |
Typical matters | Residential building claims, including statutory warranty claims | Commercial construction claims; dedicated construction list | The largest matters; challenges to adjudication determinations; injunctions; building and engineering disputes may be entered in the Equity Division's Technology and Construction List, case managed under Practice Note SC Eq 3 | Unpaid progress claims |
Monetary limit | Up to $500,000 (HB Act s 48K(1)) | $1,250,000 for general claims (District Court Act 1973 (NSW) s 4(1)); unlimited by consent, or up to $1,875,000 where the defendant does not object (s 51(2), (4)) | No limit | No limit |
Legal representation | By leave (CAT Act s 45(1)(b); Sch 4 cl 7) | As of right | As of right | Written submissions; no hearing as of right |
Costs | Each party ordinarily bears its own (CAT Act s 60), subject to CAT Rules r 38 where more than $30,000 is claimed or in dispute | Costs follow the event; restricted where less than $40,000 is recovered (Uniform Civil Procedure Rules 2005 (NSW) (UCPR) r 42.35) | Costs follow the event | Each party generally bears its own legal costs; adjudicator's fees shared unless the adjudicator decides otherwise (SOP Act s 29) |
Result | Final, subject to appeal | Final, subject to appeal | Final, subject to appeal | Interim, but an adjudication certificate can be filed and enforced as a judgment debt (SOP Act ss 24–25); determination generally due 10 business days after the response is lodged or the response period ends (s 21(3)) |
Alternative dispute resolution
Most construction disputes settle, and the ones that settle earliest are usually the ones that cost least. Mediation, expert determination and structured negotiation each provide a route to resolution without a hearing, and many contracts require one or more of them before proceedings can be commenced.
Mediation is the most common. It is confidential, it is without prejudice, and it allows the parties to resolve a dispute on commercial terms that a court could not order. Its value in construction matters is that the parties usually have a continuing or future commercial relationship, and a negotiated outcome preserves it where a trial would end it. The options, their timing, and how to prepare for each are dealt with in our guide, Alternative dispute resolution in NSW.
Costs and enforcement
Costs in NSW courts are governed by the court's discretion under the Civil Procedure Act 2005 (NSW) s 98 and the UCPR rr 42.1–42.2. The starting position is that costs follow the event, and that they are assessed on the ordinary basis unless the court orders otherwise. Where a matter falls within the District Court's lower band, r 42.35 restricts the recovery of costs: if the amount recovered is less than $40,000, costs are not ordinarily awarded unless the court is satisfied that it was warranted to commence the proceedings in that court. That is a factor in deciding where to commence.
Enforcement is a separate exercise. A judgment may be enforced by writ, garnishee, examination or bankruptcy proceedings, and a company judgment may support a statutory demand. Each route has its own requirements, and the choice depends on what the debtor owns and whether it is solvent. The costs regime and the enforcement options should be considered before proceedings are commenced, not after judgment is obtained.
Work health and safety
The primary duty
Safety on construction sites in New South Wales is regulated by the Work Health and Safety Act 2011 (NSW) (WHS Act) and the regulations made under it. The framework imposes a primary duty on each person conducting a business or undertaking (PCBU) to ensure, so far as is reasonably practicable, the health and safety of workers and of others who may be affected by the work (s 19). The duty is owed by every PCBU involved in the work (s 16), which on a construction site means the principal, the head contractor, and each subcontractor, at the same time.
The words "so far as is reasonably practicable" carry the weight, and s 18 of the WHS Act defines them. The duty is not absolute, but it requires the duty holder to identify the risks, assess what can be done to eliminate or minimise them, and then do what is reasonably practicable. A duty holder that has not turned its mind to the risk is not protected by the qualification.
Officers and due diligence
The framework places a separate duty on officers of corporations — directors and senior managers — to exercise due diligence to ensure the corporation complies with its duties (s 27 of the WHS Act; the steps that make up due diligence are listed in s 27(5)). That duty is personal. It is discharged by taking reasonable steps to acquire and keep up to date with safety knowledge, to understand the hazards of the business, to ensure the corporation has adequate resources and processes for safety, and to verify that they are being used.
The practical consequence for construction businesses is that safety obligations cannot be delegated to a site manager and forgotten. A director who has no visibility of the safety system, and who cannot demonstrate that it was being checked, is exposed personally, in addition to the exposure of the company.
Enforcement
The safety regulator enforces the framework through improvement notices, prohibition notices and prosecution (WHS Act ss 191, 195 and 31–33). Prohibition notices stop work immediately and are the most disruptive step available, while prosecutions follow serious incidents and carry substantial penalties. The regulator also has powers to require information and to enter sites.
Three further obligations matter after an incident. A PCBU must ensure that the regulator is notified immediately after becoming aware that a notifiable incident has occurred (WHS Act s 38); failing to notify carries a maximum penalty of 121 penalty units for an individual and 607 penalty units for a body corporate. Separately, where a worker is injured, the employer must notify its workers compensation insurer within 48 hours after becoming aware of the injury (Workplace Injury Management and Workers Compensation Act 1998 (NSW) s 44(2)). The person with management or control of the workplace must, so far as is reasonably practicable, ensure that the site of a notifiable incident is not disturbed until an inspector arrives or directs otherwise, although action to assist the injured, make the site safe or assist police is permitted (WHS Act s 39). And the WHS Act now contains an offence of industrial manslaughter, carrying a maximum penalty of $20 million for a body corporate and 25 years' imprisonment for an individual. As an alternative to prosecution, the regulator may accept an enforceable undertaking (a WHS undertaking), under which the duty holder commits to specified safety improvements; while it is in effect, and once it has been completely discharged, no proceedings may be brought for the contravention it covers (WHS Act s 222).
The interaction with the civil side is important and frequently underestimated. After a serious incident, the regulator's investigation produces material that may be used in civil proceedings, and the civil obligations arising from the same incident — to workers, to subcontractors and to the principal — run in parallel with the regulatory process. Managing one without regard to the other is a common error. The regulator's guidance and the obligations that apply on site are published by SafeWork NSW.
Planning, environment and site obligations
Conditions of consent
Building work is lawful only if it is authorised. The planning framework is established by the EP&A Act, and development consent is granted subject to conditions imposed under s 4.17 that bind the developer, run with the land, and are enforceable by the consent authority, and any person may bring proceedings under s 9.45 to remedy or restrain a breach of the EP&A Act, including a breach of a condition.
For construction law, conditions of consent matter in three ways. Where the building contract requires compliance with the approvals, the conditions become contractual obligations as well as planning obligations. Breach of a condition can attract enforcement action against the developer, and in some circumstances against the person carrying out the work. And the approved documents form part of the design the builder is required to follow, which means they supply the benchmark against which defective work is assessed.
Environmental obligations during works
Construction activity carries obligations that operate independently of the contract and of the planning approval. The most common are sediment and erosion control and the management of runoff, the control of noise and dust, the management of waste, and the protection of trees and waterways where the approval requires it. The water and waste obligations are statutory rather than contractual in origin: s 120(1) of the Protection of the Environment Operations Act 1997 (NSW) (POEO Act) makes it an offence to pollute any waters, and s 143(1) makes it an offence to transport waste to a place that cannot lawfully be used as a waste facility for that waste, extending to the owner of the waste and the owner of the vehicle as well as to the transporter. Those obligations are enforced by the environment regulator and by the local council.
The contractual consequence is that environmental compliance is usually a contractual obligation as well as a regulatory one. A contractor that breaches an environmental requirement may face regulatory action and a contractual claim simultaneously, and the contract may also require the contractor to indemnify the principal for the consequences through an environmental indemnity clause. An indemnity reallocates the cost between the parties; it does not relieve either of them of its statutory obligations.
Contamination, waste and licensing
Contaminated land, the classification and disposal of waste, and the environment protection licence required for certain scheduled activities are areas where construction and environmental law intersect most directly. Waste classification determines where material may lawfully be taken, which determines cost, which in turn determines who bears it under the contract. The classification is given legal force by s 143(1) of the POEO Act, which turns on whether the receiving place can lawfully be used as a waste facility for that waste, and s 143(2), which places the onus on the defendant to prove that it can. The EPA's Waste Classification Guidelines, a non-statutory guidance document, describe how material is to be classified.
The point for a construction dispute is that these are not peripheral issues. A decision about whether excavated material is classified as virgin excavated natural material or as waste can change the cost of a project materially. The POEO Act's dictionary in Sch 6 defines waste to include any discarded, rejected, unwanted, surplus or abandoned substance, and provides that a substance is not precluded from being waste merely because it is or may be processed, recycled, re-used or recovered. The term "virgin excavated natural material" comes not from the POEO Act but from the classification framework the regulator applies under the waste regulation. And the contract's provisions on latent conditions, statutory requirements and changed law determine which party carries that change. The regulator's requirements are published by the NSW Environment Protection Authority.
Insurance and risk transfer
Contract works and the site policy
Construction risk is transferred in two directions at once. The contract allocates risk between the parties by its terms, and insurance transfers part of that risk to an insurer. The two do not always line up, and the gap between them is where uninsured losses live.
Contract works insurance, often called the site policy, responds to physical loss or damage to the works and to materials on site during the construction period. The policy is usually taken out by the principal or the head contractor and extended to the other participants as insured parties, which means each of them may claim under it. Professional indemnity cover, by contrast, responds to claims arising from a failure in professional service, and it is the cover that designers and consultants carry.
The practical point is that the obligation to insure is contractual. Where the contract requires a party to effect and maintain cover, a failure to do so is a breach, and where a loss occurs that would have been covered, the party in breach may be liable for the loss it failed to insure against. Checking the certificates is a routine step that is often deferred until after the event.
Professional indemnity for designers and consultants
Professional indemnity cover responds to claims arising from negligent design, certification or advice. Two features of the cover shape construction disputes. It is written on a claims-made basis, which means the policy that responds is the one in force when the claim is made rather than the one in force when the work was done. And most policies carry a self-insured excess and a limit of indemnity, which means the first part of any loss and everything above the limit falls back on the insured.
For a designer or consultant facing a claim, those features determine the practical strategy. A claim made after a policy has lapsed may be uninsured, which explains why firms maintain run-off cover after they cease practising. And a claim that exceeds the limit of indemnity may affect the insured's ability to fund the excess of the loss, which is a factor in settlement.
Public liability insurance and third parties
Public liability insurance responds to injury to persons and damage to property of third parties arising out of the insured's activities. On a construction site, the cover is engaged by injury to visitors, damage to adjoining property, and damage to services that the contractor did not own.
The gap that catches parties most often is the boundary between the site policy and the liability policy. Damage to the works is generally the province of the site policy, while damage to property outside the works is generally the province of the liability policy. Where the same incident causes both, two insurers may be involved, and each may look to the other before indemnifying. A party that has suffered a loss should therefore notify both policies rather than deciding for itself which applies.
Why insurance does not replace a claim
Insurance responds to the loss it is written to cover, subject to its exclusions, conditions and limits. It does not answer the contractual question of which party bears the risk in the first place, and it does not remove the need for a claim against the party responsible.
In practice, the two operate side by side. A party may recover under its own policy and still pursue the responsible party, although the insurer may then pursue that party in the insured's name (subrogation). Cover may respond to a loss that the contract places on the other party, leaving the insurer to pursue recovery in the insured's name. And a loss that falls outside both the cover and the other party's liability is borne by the party that suffered it, which is why the contract's allocation of risk matters as much as the policy.
Notifying insurers and the consequences of delay
Most policies require prompt notification of circumstances that may give rise to a claim. Late notification is one of the most common reasons a claim is declined or cover is reduced, and the obligation is triggered by a circumstance that might give rise to a claim, not only by a formal demand.
The practical discipline is to notify early and in writing, to keep a record of the notification, and not to admit liability or agree a compromise without the insurer's knowledge. Where a claim is notified and then settles, the insurer's position on costs and indemnity is usually better preserved by a file that shows the notification was prompt.
Records, notices and time limits
Why the record decides the dispute
Construction disputes are decided on documents, and the documents that decide them are almost always created before anyone expected there to be a dispute. Site diaries, daily reports, progress photographs, inspection records, meeting minutes, programme updates and correspondence together establish what happened, when, and what each party knew. A case constructed from those records is durable; a case constructed from memory a year later is not.
Three categories of record do the most work. Records that establish the state of the work at a point in time, because they resolve questions about completion, defects and delay. Records that establish what was instructed, because instructions determine entitlement to variations and extensions of time. And records that establish what each party was told, because notice and knowledge determine whether a claim was made in time.
The obligation to keep those records is usually contractual as well as practical. Many contracts specify the records a party must maintain and produce, and a party that has not kept them may find that its claim fails for want of the evidence the contract required it to have.
The notices the contract requires
Construction contracts are full of notice requirements, and they serve a purpose beyond administration. A notice tells the other party that an event has occurred, that it may have a consequence, and that the recipient should act. A claim made without the notice the contract requires may be defeated even where the entitlement was clear, because the contract made the notice a condition of the entitlement.
The notices that appear most often are notices of delay and claims for extension of time, notices of variation, notices of dispute, notices of default, and notices reserving rights. Each has a required form, a required recipient, and a required time. Where the contract prescribes a method of service, that method must be used, because a notice given another way may not be treated as given at all.
Time limits and how they operate
Time limits in construction contracts are enforced, and they run from events rather than from the moment a party becomes aware of the full extent of its loss. That is what makes them dangerous: a party that discovers the true cost of a delay months after the event may find that the period for notifying the claim has already expired.
Three habits reduce the risk. Serve a notice as soon as an event occurs, even where the consequences are not yet clear, because a notice may be supplemented later. Diarise every period the contract imposes, including the periods that run from service of a document by the other party. And where a period is about to expire and the position is unclear, serve a notice reserving the position rather than allowing the period to pass in silence.
Time limit: the periods below are the statutory defaults most often in play. Many run in business days, and a construction contract may shorten some of the payment periods, so always check the contract as well.
Step | Period | Source |
Payment schedule in response to a payment claim | 10 business days after the claim is served, or earlier if the contract requires | SOP Act s 14(4) |
Payment due: principal to head contractor | 15 business days after the claim is made | SOP Act s 11(1A) |
Payment due to a subcontractor | 20 business days after the claim is made, or earlier if the contract requires (non-residential); for an exempt residential construction contract, the date the contract provides or, if it is silent, 10 business days | SOP Act s 11(1B)–(1C) |
Adjudication application where the schedule is less than the claim | 10 business days after receiving the schedule | SOP Act s 17(3)(c) |
Adjudication application where the scheduled amount is not paid by the due date | 20 business days after the due date for payment | SOP Act s 17(3)(d) |
Notice of intention to apply for adjudication where no schedule was given | Within 20 business days after the due date; the respondent then has 5 business days to give a schedule, and the application must be lodged within 10 business days after that | SOP Act s 17(2), (3)(e) |
Adjudication response | 5 business days after receiving the application, or 2 business days after notice of the adjudicator's acceptance, whichever is later; available only if a payment schedule was provided in time | SOP Act s 20(1), (2A) |
Adjudication determination | 10 business days after the adjudication response is lodged or the period for lodging it ends (or, where no response may be lodged, after notice of the adjudicator's acceptance), unless the parties agree to more time | SOP Act s 21(3) |
Payment of the adjudicated amount | 5 business days after the adjudicator serves the determination on the respondent, or any later date the adjudicator determines | SOP Act s 23 |
Notice before suspending work for non-payment | At least 2 business days after notice of intention to suspend, which must state that it is made under the Act | SOP Act s 27; see also s 24(2) |
Notifiable WHS incident | Notify the regulator immediately | WHS Act s 38 |
Statutory demand: comply, or apply to set aside | 21 days after service; an application to set aside must be filed, with a supporting affidavit, and served within that period | Corporations Act 2001 (Cth) ss 459E, 459G |
Residential statutory warranty | 2 years; 6 years for a breach resulting in a major defect; plus 6 months if the breach becomes apparent in the last 6 months | HB Act s 18E |
Long stop for defective building work claims | 10 years from completion | EP&A Act s 6.20 |
Retaining documents after the project ends
The documents that decide a construction dispute may be created years before the dispute arises, and the relevant retention period is measured backwards from the end of the limitation period, not from the end of the project. Records should therefore be retained for the full period during which a claim may be brought, which for contractual claims may be six years from the breach (Limitation Act 1969 (NSW) s 14(1)) and twelve years where the claim is founded on a deed (s 16).
Retention matters most for the categories that are difficult to reconstruct: programme and delay records, quality and inspection records, and the notices exchanged between the parties. A project file that contains only the contract, the drawings and the final account will not answer the questions that a defect or delay claim actually raises.
Latent conditions and site risk
What the contract assumes, and what the ground delivers
Every construction price rests on an assumption about the conditions the contractor will encounter. Where the ground, the services or the structure of an existing building differ materially from what the contract documents disclosed, the cost of the work changes, and the question becomes which party carries the difference.
Contracts approach that question in different ways. Some place the risk of physical conditions on the contractor, on the basis that a competent contractor investigates before it prices. Others define a class of latent conditions that the principal carries, usually by reference to what a reasonably experienced contractor could have anticipated from the information supplied. The definition is where the dispute is decided, because it fixes the line between a condition that was simply difficult and a condition that was outside the parties' shared assumption.
The distinction matters because it changes the character of the claim. A variation claim for additional work assumes a contract that continued and a scope that changed. A latent conditions claim asserts that a fundamental assumption on which the price was based was wrong. The two attract different notice requirements, different evidence, and different measures of recovery, and a party that frames a latent conditions claim as a variation often loses it on that framing alone.
Both parties can reduce that exposure. Investigate before pricing, and record what the investigation covered and what it did not. Read the contractual definition of a latent condition against the site information actually supplied, rather than against the site information that exists. And give notice as soon as the condition becomes apparent, because in this area the notice period usually runs from discovery, not from the point at which the cost has been quantified.
Coordinating overlapping processes
Why the processes do not wait for each other
A construction dispute rarely runs on one track. A payment claim may be progressing through adjudication while a defect claim is being prepared, while a termination notice is under consideration, while a statutory demand sits with the other party's solicitors. Each process has its own trigger, its own period and its own decision-maker, and none of them pauses because another is running.
That is the feature of the framework that causes the most difficulty in practice. A party that focuses on the process it understands may allow a period in another process to expire. A party that responds thoroughly to a payment claim may not notice that the same facts have generated a contractual notice obligation with a shorter limit. And a party managing a dispute on one project may overlook that a different project with the same counterparty is generating parallel exposures.
The practical response is a single calendar of every period running against the matter, prepared at the outset and updated as events occur. That is an administrative step rather than a legal one, but it prevents the most expensive category of error in construction litigation, which is the claim lost on timing rather than on merits. A matter managed by reference to one document, listing every deadline and the process it belongs to, is materially less likely to fail in that way.
Sequencing the statutory and contractual routes
Three principles determine the order in which the routes should be taken.
The statutory payment route generally comes first where money is owed, because it produces an enforceable interim answer within weeks rather than the years a contested court proceeding takes. Its result is interim, which is why pursuing it gives up nothing: the determination sets a floor for cash flow, and the final position is worked out later.
The contractual route governs the final position. It determines what the parties were obliged to do, what notices were required, and what the final account should be. Where the contract contains a dispute clause that survives termination, it also determines the steps that must be taken before proceedings can be commenced. Those steps are conditions, not courtesies.
The insolvency route changes everything it touches. Where a counterparty is in external administration, the other routes against that party are constrained for the duration, and the question becomes whether to prove in the administration, to claim on insurance, or to pursue another party entirely. Where the party in difficulty is a head contractor, the subcontractors beneath it have their own decisions to make, and those decisions are time-critical.
Keeping the processes consistent with each other
Running several processes at once creates a risk that is not about timing but about consistency. A position taken in one forum may be used against the party that took it in another. A statement in a payment schedule may be put to the same party in a defect claim. An assertion in a termination notice that the works were substantially complete may sit awkwardly with a claim that the contractor had abandoned the site.
The discipline is to treat everything written in any process as part of one record. Documents should be drafted on the assumption that they will be read alongside each other, because in a contested matter they usually are. That does not mean being vague; it means being consistent, and it means checking the position taken in one document against the position taken in another before either is served.
Where two processes genuinely require different characterisations — which happens, particularly where an interim statutory determination and a final contractual claim are running together — the difference should be capable of explanation, and the explanation should be recorded at the time rather than constructed later. An interim determination and a final claim may legitimately value the same work differently, because they answer different questions on different evidence. Asserting two inconsistent versions of the facts is something else, and in a contested matter it will be exposed.
Security for performance in construction
The instruments in use
A principal's protection against a contractor's default is usually provided by one of four instruments. Retention money is a percentage withheld from each progress payment and released in defined circumstances; on projects above the statutory threshold it is also governed by the retention money trust regime (see Payment and the statutory framework). A bank guarantee is an undertaking from a bank, payable on demand or on conditions. An insurance bond is an equivalent undertaking from a surety. And a parent company guarantee is a promise from a related entity, which is worth whatever that entity is worth.
The choice between them is commercial as much as legal. Retention is cheap and requires no third party, but it ties up the contractor's cash and is exposed if the principal fails. A guarantee costs the contractor a fee but gives the principal a claim against a bank rather than against the contractor's balance sheet. That difference matters most in the circumstances in which the security is actually called, which is when the contractor is failing.
The distinction between a demand instrument and a conditional one is the single most important feature of any guarantee. A demand guarantee is payable when the beneficiary asks, without proof of default. A conditional undertaking requires the beneficiary to establish that the conditions for a call have been met before payment is due. Most disputes about guarantees are disputes about which of the two the instrument is.
Instrument | Who stands behind it | Main advantage | Main risk |
Retention money | The principal, holding withheld progress payments | Cheap; no third party required | Ties up the contractor's cash; exposed if the principal fails or the fund is not genuinely controlled; on contracts of $20 million or more, the retention money trust regime applies (SOP Act s 12A) — see Retention money trusts |
Bank guarantee | An authorised deposit-taking institution | Claim against a bank rather than the contractor's balance sheet | Usually payable on demand, so a disputed call will generally be honoured |
Insurance bond | A surety | Similar function to a bank guarantee | Worth only the surety's standing; check whether it is demand or conditional |
Parent company guarantee | A related entity | No fee or bank facility needed | Worth only the parent's balance sheet, which is often assumed rather than tested |
What each instrument is worth
The value of security depends on the issuer's standing, the amount, and whether a call can be resisted.
A guarantee issued by an authorised deposit-taking institution is worth that institution's credit, which in practice is worth more than a guarantee from a related company or a thinly capitalised insurer. A retention fund held in a controlled account is worth what is in the account, provided the account is genuinely controlled and remains funded. A parent company guarantee is worth the parent's balance sheet, and it is often accepted on the assumption that the parent is solvent without that assumption being tested.
The amount also matters, because security is usually capped at a percentage of the contract sum. Where the cost of completing defective or incomplete work exceeds the cap, the beneficiary's exposure is the difference, and the security does not answer it. That gap is one of the reasons a claimant pursues the statutory duty of care and the statutory warranties rather than relying on the security alone.
Calling security: the discipline
A call on security is a significant step, and it is one that is often taken too early. Once it has been made, the beneficiary has received money that it may have to account for, and the other party has a grievance that will be pursued.
The disciplined sequence is short. Establish that an event permitting a call has occurred. Follow whatever notice or certification step the contract requires, because many contracts make the call conditional on one. Document the amount being called and the basis on which it is calculated. And only then call. A beneficiary that calls first and establishes the default afterwards invites the argument that the security was used to fund the dispute rather than to remedy the breach.
Two further points apply where the instrument is payable on demand. The bank's obligation is generally independent of the underlying dispute, which means the call will usually be honoured even where the contractor disputes it. In Wood Hall Ltd v Pipeline Authority [1979] HCA 21; (1979) 141 CLR 443, the High Court confirmed the enforceability of an unconditional demand guarantee according to its terms and rejected attempts to qualify the beneficiary's right to call by reference to disputes under the underlying contract. Whether a call may nevertheless be restrained depends on the terms of the underlying contract and the principles developed in later authorities. And the contractor's remedy is generally to recover the money in separate proceedings, rather than to stop the payment. That asymmetry is the reason the instrument should be understood before the contract is signed, not after the call is made.
Subcontracting and the chain of responsibility
Back-to-back and its limits
Head contract terms are commonly passed down to subcontracts through flow-down clauses, on a back-to-back basis, so that the subcontractor carries the same obligations and the same risks as the head contractor. The flow-down is rarely complete. Scope definitions, timing obligations, notice periods, security arrangements and liability caps are usually different, and the differences are where disputes between the parties to the head contract and the parties to the subcontract are actually decided.
Two categories of obligation cannot be flowed down at all. The statutory warranties implied into contracts for residential building work attach to the party that contracted to do the work — s 18B(2) of the HB Act implies the same warranties into a subcontract for that work, so the obligation is duplicated down the chain rather than transferred — and the statutory duty of care owed by a person who carries out construction work attaches to that person directly (s 37 of the DBP Act). Neither can be transferred to someone else by the terms of a subcontract, which is why a head contractor cannot answer a homeowner's claim by pointing to the trade beneath it.
Payment down the chain
A subcontractor's statutory entitlement to progress payments runs against the party that engaged it (s 13(1) of the SOP Act; s 8(1)), not against the party at the top of the chain. That is a simple proposition with significant consequences. Where the head contractor fails to pay, the subcontractor's claim is against the head contractor, and the principal's exposure arises only in defined circumstances, such as where the principal has taken over the works or where a direct relationship can be established, although Div 2A of Pt 3 (ss 26A–26F) gives a subcontractor a further route in defined circumstances by requiring money to be retained.
The identity of the contracting party therefore matters more than the identity of the project. A subcontractor that has contracted with a thinly capitalised entity on a well-funded project has the credit of the entity it contracted with, not the credit of the project. Credit checks, and in some cases guarantees from a parent, are the practical answer, and they are much cheaper before the subcontract is signed than after it is breached.
Three statutory tools strengthen a subcontractor's position. A pay-when-paid clause — one that makes payment to the subcontractor depend on the head contractor being paid — has no effect in relation to a payment for construction work (SOP Act s 12). A claimant that has not been paid the amount the SOP Act requires may serve written notice of its intention to suspend work, stating that the notice is made under the Act, and, at least two business days later, suspend (s 27; and see s 24(1)(b), (2) for an unpaid adjudicated amount). And the Contractors Debts Act gives an unpaid subcontractor a route to the principal: once it holds a judgment for the debt — including an adjudication certificate filed as a judgment under s 25 of the SOP Act — it can apply to the court for a debt certificate (Contractors Debts Act s 7(1), (1A)) and serve it with a notice of claim on the principal, which must then pay to the subcontractor money it owes the head contractor, up to the amount of the debt. Where a payment withholding request has been served, the principal's obligation to retain the money generally ends 20 business days after the adjudication determination is served on it, so the notice of claim under the Contractors Debts Act should be served within that period (SOP Act s 26B(3)).
Where the chain breaks
The chain breaks in three places.
It breaks when a party becomes insolvent, because the obligations of the others do not stop at that moment but their ability to perform, and to be paid, does. It breaks when the work is terminated, because the head contractor's obligations to its subcontractors do not end with the head contract, and the subcontractors may hold claims that the principal did not anticipate. And it breaks where the notice requirements of the different contracts do not align, because a claim that has been validly made up the chain may fail if the step required by the next contract up was not taken in the period that contract allows.
Each of those breaks carries its own period, and the periods do not run together. Coordinating them is the practical work of managing a construction dispute, and it is the work that is most often left until the point at which it can no longer be done.
Insolvency and financial distress
Statutory demands
A statutory demand is the formal step by which a creditor requires a company to pay a debt within 21 days (Corporations Act s 459E), and it is the commonest route by which a construction creditor converts an unpaid debt into leverage. Where the company does not comply and does not have the demand set aside, a presumption of insolvency arises (s 459C(2)(a)) and the creditor may apply to wind the company up.
In construction, demands are served in both directions. A head contractor may serve a demand on a developer, a subcontractor may serve one on a head contractor, and the recipient may respond by applying to set the demand aside on the basis of a genuine dispute or an offsetting claim (Corporations Act s 459H), within 21 days after service (s 459G). The time limits are short and inflexible, and they run from service rather than from the date the debt became due.
Received a statutory demand? Send it to us on the day it arrives, together with anything that shows the debt is disputed, so the application to set it aside can be prepared well within the 21 days.
Director duties and insolvent trading
Where a company in the construction industry is in difficulty, the obligations of its directors become a live question. Directors must not allow a company to incur a debt when there are reasonable grounds to suspect that the company is insolvent (Corporations Act s 588G), and the duty to prevent insolvent trading is personal to each director.
Construction is unusually exposed to that duty, because the industry runs on credit. A head contractor that continues to take subcontractor work while unable to pay for it is incurring debts, and the question of when the directors had reasonable grounds to suspect insolvency is often examined after the collapse. Directors also have duties to act in good faith in the best interests of the company and to use their position properly, each of which can be enforced by the regulator or by a liquidator (Corporations Act ss 181–182).
Three further points arise for directors and their counterparties. A director who starts developing one or more courses of action reasonably likely to lead to a better outcome for the company than immediate administration or liquidation may have the protection of the safe harbour from insolvent trading liability (Corporations Act s 588GA), but the protection is lost if, when the debt is incurred, the company is failing to pay employee entitlements or to make its tax lodgements and that failure amounts to less than substantial compliance or is one of two or more such failures in the previous 12 months (s 588GA(4)). The director bears an evidential burden in relying on the safe harbour (s 588GA(3)). A payment received in the six months before the relation-back day may be recovered by the liquidator as an unfair preference if it was an insolvent transaction (ss 588FA, 588FE(2)) — a live risk for subcontractors paid by a failing head contractor — although payments forming part of a continuing running account are assessed together as a single transaction (s 588FA(3)). And a director who has given a personal guarantee, common in supply and plant hire accounts, is exposed personally whatever happens to the company.
When a counterparty fails
Where a counterparty enters external administration — most commonly voluntary administration or liquidation — the position changes immediately. Rights against the company cannot generally be enforced during an administration without consent or leave (Corporations Act s 440D). A contractual clause purporting to terminate automatically on insolvency (an ipso facto clause) may be constrained by the statutory framework (ss 415D, 434J and 451E). And the interests of other creditors become directly relevant to any step taken.
The practical response has a sequence. Establish the facts, because a rumoured cash problem and an appointment are entirely different. Decide whether to continue performing, given that new debt ranks behind existing obligations. Protect the position by securing what is held and pursuing what is due. And take advice before acting on a termination clause, because the interaction between the contract and the insolvency framework is one of the few areas where the order of steps changes the remedies available.
Example: A head contractor has an adjudication application on foot against its developer principal when the developer appoints voluntary administrators. Any step to enforce a determination in court against the developer will generally need the administrator's consent or the court's leave (Corporations Act s 440D), and a termination clause triggered by the appointment itself may be unenforceable (s 451E). Meanwhile, the head contractor's own subcontractors remain entitled to serve payment claims on it. Its decisions — whether to keep working, whether to prove in the administration, whether security or insurance can be called — have to be made in days, with every period on both sides of the chain diarised.
Consumer protection and residential work
The Australian Consumer Law
The Australian Consumer Law (ACL), which is Sch 2 to the Competition and Consumer Act 2010 (Cth), applies to conduct in trade or commerce, which includes residential building work and much of the conduct surrounding it. Its most relevant prohibitions in the construction context are those against misleading or deceptive conduct (ACL s 18), against false or misleading representations (s 29), and against unconscionable conduct, both within the meaning of the unwritten law (s 20) and in connection with the supply or acquisition of goods or services (s 21). It applies in New South Wales as a law of the State under the Fair Trading Act 1987 (NSW) s 28.
Three features make it significant. It operates alongside the contract and the statutory warranties rather than replacing them, so the same conduct may breach all three. It reaches conduct during negotiation and marketing, not only during performance. And it is not confined to consumers, which means it can be invoked in dealings between businesses as well. The remedies include damages (ACL s 236), compensation orders on the application of an injured person or the regulator (s 237), and orders varying, refusing to enforce or declaring void the whole or part of a contract (s 243).
Two further parts of the ACL bear directly on construction. Where services are supplied to a consumer — broadly, where the price is $100,000 or less or the services are of a kind ordinarily acquired for personal, domestic or household use (ACL s 3) — the consumer guarantees require them to be rendered with due care and skill (s 60) and, where the consumer has made a purpose known, to be reasonably fit for that purpose (s 61); those guarantees cannot be excluded by contract (s 64), although for services not of a kind ordinarily acquired for personal, domestic or household use a supplier may limit its liability where it is fair and reasonable to do so (s 64A), and they sit alongside the HB Act warranties. The fitness-for-purpose guarantee does not apply to professional services provided by a qualified architect or engineer. And the unfair contract terms regime (ACL ss 23–28) applies to standard form consumer contracts and to standard form contracts with small businesses (broadly, a party with fewer than 100 employees or annual turnover under $10 million), which captures many standard form subcontracts: a term found to be unfair is void, and since 9 November 2023 proposing, using or relying on an unfair term in such a contract can attract a civil penalty. The penalty regime applies to contracts made or renewed on or after that date, and to terms varied or added after it.
When a homeowner complains: the routes a contractor faces
A contractor whose residential work is the subject of a complaint may face several routes at once, because the homeowner can use them in parallel. A claim for breach of the statutory warranties. A complaint to Building Commission NSW, which may result in an inspection, a rectification order or enforcement action. A claim on the insurance scheme where the cover responds. And proceedings in NCAT.
The routes interact, and the order in which they are used matters. A regulator's inspection may produce evidence that assists a civil claim, and a failure to comply with a rectification order is itself an offence (HB Act s 49E). But a homeowner who carries out repair work before the defect is documented, or who settles a claim without understanding the insurance position, may lose remedies that were otherwise available. That is the reason the choice of route deserves advice before the first step rather than after.
Before you act
Three questions should be answered before any step is taken. Identify the instrument before the argument, because the statute and the contract rarely produce the same answer. Identify the time limit before the merits, because in this field a good claim can be lost by a missed period. And identify the forum before the strategy, because NCAT, the courts and an adjudication each impose their own rules about evidence, representation and costs.
Key cases referred to in this guide
· Pafburn Pty Limited v The Owners - Strata Plan No 84674 [2024] HCA 49 — a builder or developer that delegates or entrusts construction work cannot apportion its liability for breach of the duty under s 37 of the DBP Act.
· Kapila v Monument Building Group Pty Ltd [2025] NSWSC 1306 — applying the Court of Appeal's reasoning, no claim under s 37 of the DBP Act can be apportioned (a first-instance decision).
· Roberts v Goodwin Street Developments Pty Ltd [2023] NSWCA 5 — the duty under s 37 of the DBP Act is not confined to residential apartment buildings and operates retrospectively as the Act prescribes.
· Brookfield Multiplex Ltd v Owners Corporation Strata Plan 61288 [2014] HCA 36 — on its facts, no common law duty of care to avoid pure economic loss was owed to the owners corporation.
· Bryan v Maloney [1995] HCA 17; (1995) 182 CLR 609 — a builder's duty to the subsequent purchaser of a dwelling built under a simple contract.
· Probuild Constructions (Aust) Pty Ltd v Shade Systems Pty Ltd [2018] HCA 4 — an adjudication determination cannot be quashed for non-jurisdictional error of law on the face of the record.
· Pavey & Matthews Pty Ltd v Paul [1987] HCA 5; (1987) 162 CLR 221 — restitutionary recovery for work done under an unenforceable contract.
· Wood Hall Ltd v Pipeline Authority [1979] HCA 21; (1979) 141 CLR 443 — an unconditional demand guarantee is enforceable according to its terms.
· Bellgrove v Eldridge [1954] HCA 36; (1954) 90 CLR 613 — the cost of rectification is the measure of damages where rectification is necessary and reasonable.
How Merlo Law can help
Merlo Law, led by principal John Merlo, acts for builders, head contractors, subcontractors, developers, suppliers and consultants across every layer of the framework set out above. The firm maintains a dedicated NSW practice — see our NSW building and construction law page — and appears in NCAT building disputes, the Supreme Court and District Court of New South Wales, and Building Commission NSW matters.
Most clients come to us with a document already on the desk: a payment claim or payment schedule, an adjudication application, a show cause notice, a defects claim, a termination notice or a statutory demand. Each of those starts a period running, and some of those periods are measured in business days. If you have received one, the most useful step you can take today is to send it to us with the contract.
We will tell you which regime governs the problem, every time limit running against you or in your favour, and the first steps to take — and then act on them. That may mean preparing a payment schedule or adjudication application through our security of payment advice team, responding to the regulator or pursuing or defending a defects claim through our construction law advice team, representing you in NCAT building disputes, or running court proceedings or a negotiated resolution through our dispute resolution team. Where the problem has a corporate or insolvency dimension, our commercial law advice team works alongside.
Request a consultation to get started.
Conclusion
Building and construction law in New South Wales operates on several layers at once, and the layers do not produce the same answer. The statute supplies obligations that apply whether or not the parties agreed to them. The contract supplies the mechanism the parties must use. The general law fills the space where neither reaches. Regulation, safety, planning, payment and insolvency each add a framework of their own.
The consequence is practical. In most construction matters the outcome is determined less by the strength of the grievance than by identifying the right instrument, operating its processes in time, and choosing the right forum. This overview has set out how the framework is structured and where the detail sits. Each of our guides takes one layer and deals with it properly.
This overview states NSW law as at 3 November 2026. It covers the NSW legislation, and the Commonwealth corporations and consumer laws, that most often govern building work in New South Wales. It does not deal with the law of other States and Territories, employment and industrial relations, or tax, and it does not address the terms of any particular contract. It is general guidance only and is not advice on any particular matter. If a deadline is running, take advice on your own documents.
Glossary
The terms used most often in this guide, and what each means in New South Wales.
Term | Meaning |
PCBU | A person conducting a business or undertaking under the WHS Act — the primary duty holder for safety on a site, a category that reaches the principal, the head contractor and each subcontractor at the same time (WHS Act s 19). |
payment claim | A claim for a progress payment made under the SOP Act (s 13), which must identify the construction work to which it relates and state the amount claimed — and, for contracts entered into on or after 21 October 2019, state that it is made under the Act. |
payment schedule | The respondent's written response to a payment claim under the SOP Act (s 14), identifying the amount it proposes to pay and the reasons for withholding any balance. |
adjudication certificate | The certificate issued by the adjudicator stating the amount payable (SOP Act s 24), which may be filed in a court, where it takes effect as a judgment debt (s 25). |
reference date | Under the pre-2019 SOP Act regime (Sch 2), the date from which a payment claim could be served; a claim served without a live reference date was invalid. |
practical completion | The contractual stage at which the works are complete except for minor defects or omissions that do not prevent their use; under most standard forms it stops liquidated damages accruing, passes possession and starts the defects liability period. |
superintendent | The person the contract appoints to direct, assess and certify under it — extensions of time, progress certificates and practical completion — who, under forms such as AS 4000 (cl 20), must act honestly and fairly. |
defects liability period | The contractual period after practical completion during which the contractor must return to rectify notified defects. It does not limit the statutory warranty periods, the s 37 duty or the general limitation periods. |
latent condition | A physical condition on the site that differs materially from what the contract documents disclosed or from what a competent contractor could have anticipated; the contract's definition decides which party carries it. |
non-delegable duty | A duty that the person who owes it cannot discharge by engaging someone else to perform the work carefully — the character of the s 37 DBP Act duty confirmed in Pafburn. |
proportionate liability | The scheme in Pt 4 of the Civil Liability Act 2002 (NSW) that apportions liability for economic loss or property damage between concurrent wrongdoers according to their responsibility — unavailable, on current NSW authority, against a claim under s 37 of the DBP Act. |
ipso facto clause | A contractual clause that terminates or modifies rights automatically on a counterparty's insolvency; constrained by the Corporations Act's stay provisions (ss 415D, 434J and 451E). |
quantum meruit | A claim for a reasonable sum for work done, independent of the enforceability of the contract — the remedy recognised in Pavey & Matthews, and confined for uninsured residential work by HB Act s 94. |
HBCF | The Home Building Compensation Fund — the statutory insurance scheme under Pt 6 of the HB Act, provided through icare, that responds where a residential builder dies, disappears or becomes insolvent. |
occupation certificate | A certificate under the EP&A Act (ss 6.4–6.7) that authorises the occupation or use of a new building. It certifies the matters the Act and regulations require — not that the building is free of defects. |
prohibition order | An order made by Building Commission NSW under the RAB Act (s 9) that prevents an occupation certificate being issued and a strata plan being registered while it is in force. |
building bond | The bond of 2% of the contract price that the developer of an eligible strata building must give the Secretary under Pt 11 of the Strata Schemes Management Act 2015 (NSW) before applying for an occupation certificate, available to the owners corporation for defects found in the scheme's inspections. |
retention trust | The trust regime under SOP Act s 12A and the Building and Construction Industry Security of Payment Regulation 2020 (NSW) that requires head contractors on contracts of $20 million or more to hold retention money for subcontractors in a compliant trust account. |
FAQs
What is building and construction law in NSW?
It is the set of overlapping regimes that govern building work in New South Wales: the statutory framework for licensing, warranties, registration and the statutory duty of care; the payment regime established by the security of payment legislation; the contract between the parties; the safety and planning frameworks; the law of insolvency where a party fails; and the general law of contract and negligence that fills the gaps.
Does a construction contract have to be in writing in NSW?
For residential building work, the HB Act requires certain contracts to be in writing and to contain prescribed particulars (s 7(1)–(2), and s 7AAA for small jobs; the prescribed amounts are $20,000 and $5,000 respectively: HB Regulation reg 5), and a person who fails to comply may be unable to enforce the contract (s 10(1)(b) of the HB Act, which applies where the contract is not in writing or does not sufficiently describe the work). Commercial construction contracts are not subject to the same requirement, but the practical reasons for writing them down are strong, because the terms that decide disputes — scope, time, payment and notice — are the terms a written contract supplies.
Do the statutory warranties apply to commercial projects?
The warranties implied by the HB Act (s 18B) apply to residential building work. Commercial projects do not have the same statutory warranty regime, and the standard is set by the contract and by the general law. The statutory duty of care introduced by the DBP Act is different in character and applies to persons who carry out construction work, subject to the terms of that Act. The Court of Appeal has held that the duty is not confined to residential apartment buildings (Roberts v Goodwin Street Developments Pty Ltd [2023] NSWCA 5), so whether it reaches a particular commercial project should be checked against the definitions in s 36(1) of the DBP Act rather than assumed either way.
Can a party still rely on proportionate liability after Pafburn?
Not for a builder or developer that delegated or entrusted the work to others: the High Court held that such a party cannot apportion its liability for breach of the statutory duty of care under the DBP Act. The High Court left open the position of a party that performed the work itself, but the NSW Court of Appeal's reasoning, applied by the Supreme Court in Kapila v Monument Building Group Pty Ltd [2025] NSWSC 1306, is that no claim under the duty can be apportioned. On current NSW authority, a defendant cannot reduce its exposure by pointing to other parties who also failed, although it may pursue contribution from them by cross-claim (Law Reform (Miscellaneous Provisions) Act 1946 (NSW) s 5).
What is the first step when a construction dispute arises?
Identify the instrument that governs the problem, check every time limit that applies to a claim under it, and preserve the records that evidence the position — including notices, programme updates, site records and correspondence. Those three steps determine whether the substantive rights remain available at all.
What happens if I don't provide a payment schedule in time?
A respondent that wishes to dispute a payment claim under the SOP Act must provide a payment schedule within 10 business days after the claim is served, or any earlier time the contract requires (s 14(4)). A respondent that misses that period may become liable for the claimed amount. If the claimant then gives notice of its intention to apply for adjudication, the respondent has a further 5 business days to provide a schedule (s 17(2)(b)); if it misses that chance too, it cannot lodge an adjudication response at all (s 20(2A)). Even where a schedule is given, the response cannot raise reasons for withholding payment that the schedule did not state (s 20(2B)). Treat every payment claim that states it is made under the Act as a deadline, not as correspondence.
When must retention money be held on trust in NSW?
Where a head contractor holds retention money under a construction contract with a contract value of $20 million or more, the money must be held on trust for the subcontractor entitled to it and paid into a retention money trust account that complies with the Building and Construction Industry Security of Payment Regulation 2020 (NSW) (SOP Act s 12A; Regulation Pt 2). The account must be separate and clearly identified as a trust account, and the head contractor must keep a ledger for each subcontractor and give the subcontractor a copy at least every three months (Regulation cl 16). Withholding of up to 5% of the contract price is market practice rather than a statutory cap. A regulation under s 12A may create an offence punishable by up to 1,000 penalty units (s 12A(4)).
What is the strata building bond and inspections scheme?
Under Part 11 of the Strata Schemes Management Act 2015 (NSW), the developer of an eligible residential strata building must give the Secretary a bond — 2% of the contract price — before an application is made for an occupation certificate (s 207(1)). An approved building inspector provides an interim report and a final report on defects, the final inspection being arranged no later than 18 months after completion (s 200). The owners corporation may claim the amount secured for defects found and not rectified (s 209); if there are no defects, the bond is returned. The scheme runs alongside the statutory warranties and the duty of care under the DBP Act — it does not replace them.
What can Building Commission NSW do about defective apartment buildings?
Under the Residential Apartment Buildings (Compliance and Enforcement Powers) Act 2020 (NSW), the developer must notify the Secretary (in practice, Building Commission NSW) of the expected occupation certificate application at least 6 months, but not more than 12 months, before it is made (s 7). The Commission can make prohibition orders, which prevent an occupation certificate being issued and a strata plan being registered while they are in force (s 9); building work rectification orders, which require defects to be brought to the required standard (s 33); and stop work orders, which halt work involving a risk of harm (s 29), supported by investigation and entry powers (Pt 3). These are regulatory powers: a claim under the statutory warranties or the DBP Act duty can still be brought, and a building work rectification order may itself be used in later proceedings (s 43).
Where should a construction dispute be commenced in NSW?
It depends on the amount in dispute, the identity of the parties and the relief sought. NCAT determines most residential building claims, with restricted representation (CAT Act s 45(1)(b)) and costs ordinarily borne by each party (s 60), subject to the wider power to award costs in r 38 of the CAT Rules. The courts determine commercial matters, with costs following the event. Where the dispute concerns an unpaid payment claim, the statutory adjudication process is usually the first route, and it operates before either forum.
This guide is for informational purposes only and does not constitute legal advice. For advice tailored to your specific circumstances, please contact Merlo Law
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