Principal Refusing a Rock Variation? Construction Contracts and Forcing Payment Under QLD's BIF Act

John Merlo
9 minutes ago
13 min read

KEY TAKEAWAYS

Hitting unexpected hard rock often forces civil contractors into a cash flow crisis if the principal verbally directs continued work but refuses formal variation approval.
Contractual time bars and "written approval only" clauses do not automatically extinguish your rights; the Building Industry Fairness (Security of Payment) Act 2017 (BIF Act) may still provide a pathway to pursue interim payment.
Unapproved latent condition variations should typically be included in statutory progress claims, provided the construction work is adequately identified.
If the principal fails to issue a valid payment schedule within the statutory timeframe, they may become liable for the full claimed amount, regardless of what the contract
says.

Your excavators have just struck a massive, undeclared band of hard rock on a major subdivision trenching run. The principal's superintendent is standing on the edge of the cut, verbally directing you to keep ripping to maintain the program schedule, but they are flatly refusing to sign off on your formal variation claim. You are now staring down a half-million-dollar excavation blowout, and the principal expects you to carry the cost until practical completion. This is the classic latent condition trap, designed to leverage your balance sheet to fund the principal's project. However, standard form civil contracts do not sit above Queensland law. By using the statutory mechanisms of the BIF Act, you can secure interim cash flow and move the commercial pressure back onto the developer.

The Latent Condition Ultimatum: Fund the Excavation or Down Tools?

The choice you face on site right now is brutal. You can either bleed cash to keep the machines running, or you can pull your crews and face immediate, aggressive correspondence from the principal. Assess your commercial exposure now, before the next payment cycle closes, rather than waiting for a superintendent to suddenly change their mind.

The Financial Traps of Self-Funding Rock Extraction

When dealing with unforeseen rock—a classic latent conditions civil construction issue—the default position for many contractors is to keep working and fight about the money later. However, self-funding massive excavation costs out of your own working capital without clear commercial law advice is a dangerous strategy. Fighting a protracted dispute over latent conditions in Queensland can severely drain your liquidity, which may ultimately trigger a QBCC minimum financial requirements (MFR) breach if your net tangible assets fall below the mandated threshold.

Conversely, if you decide to down tools and halt the earthworks, you open up an entirely separate exposure channel. Halting work without a valid legal basis often exposes the contractor to immediate liquidated damages claims and allegations of contractual repudiation. This creates a high-risk cash flow crisis that calls for a prompt, disciplined statutory response rather than waiting for the final account to argue the contract.

Construction Contracts: Separating the Contractual Time Bar from Your Statutory Payment Right

The most common mistake a civil contractor makes is confusing the contract with the statute. When a superintendent formally rejects your variation claim because you allegedly missed a notice deadline under time bar clauses in Queensland, they are exercising a procedural mechanism under the contract. Many contractors incorrectly assume this rejection permanently kills their right to get paid for the extra rock broken.

A superintendent's rejection of a variation claim under a contractual time bar does not legally extinguish a civil contractor's right to pursue that same variation through a statutory payment claim under the BIF Act.

The statutory security of payment regime operates on a parallel track to your construction contracts. While a missed notice for a time bar clause variation claim may allow the principal to deny liability contractually, an adjudicator assessing a statutory payment claim is likely to examine whether the time bar itself is valid, or whether it has been waived by the principal's conduct on site. Therefore, a civil contractor should not abandon a variation claim merely because a superintendent points to an expired notice period in the general conditions.

The Risk of Relying on Verbal Superintendent Directions

Warning: Proceeding with massive rock excavation based purely on a superintendent's verbal instruction to "just get it done" can severely compromise your ability to recover costs.

Standard form civil contracts almost universally contain "written approval only" clauses, mandating that no variation will be valued without prior written direction from a specifically authorised representative. While the enforceability of this clause depends on statutory override provisions and equitable doctrines like unjust enrichment, these clauses remain a primary risk factor for contractors. If the rock is already out of the ground, the principal may attempt to deny that the superintendent had the actual authority to verbally approve a financial variation, weaponising the strict contractual text against you. Such verbal directions can make your entitlement very difficult to prove, exposing your claim to robust legal challenge.

Bypassing Contractual Deadlocks: The BIF Act Payment Pathway

At this stage, the contract feels like a straitjacket designed purely to deny your entitlement to the extra work you’ve already performed. But standard form civil contracts don't sit above Queensland law. By elevating your unapproved variation into a formal statutory payment claim, you can leverage official QBCC security of payment guidance to bypass the superintendent’s stonewalling and force the principal to formally respond.

Drafting a Valid Section 68 Payment Claim for Disputed Earthworks

To move a disputed variation out of the contractual deadlock and into the statutory arena, you must translate it into a valid progress payment claim. Section 68 of the BIF Act establishes the strict procedural mechanism required to trigger the protections of the BIF Act. The legislation states that a payment claim must be a written document that identifies the construction work or related goods and services to which the progress payment relates.

Under section 68 of the BIF Act, a valid payment claim for a disputed variation must be a written document that explicitly identifies the specific civil construction work performed and the amount claimed.

Note that using the word "invoice" is not itself fatal — under section 68(3), a document bearing that word is taken to satisfy the requirement to request payment. The real risk is inadequate identification of the work: if you simply send a document with a vague line item for "extra rock," you fail to satisfy the statutory definition, and your claim will not trigger the Act's rapid payment process. You must clearly separate the original scope from the variation, detail the volume of rock extracted, apply the appropriate rates, and explicitly state the amount due. Proper documentation is a mandatory threshold requirement, not an optional extra.

Front-Loading Geotechnical Evidence Before Issuing the Progress Claim

Expert insight: The moment you serve a contentious rock variation inside a progress claim, you start a clock you cannot pause. Once the principal issues a payment schedule scheduling the variation to nil and you proceed to adjudication, the material you rely on is largely fixed by your application. Contractors routinely lose recoverable rock because the survey and density evidence was assembled after the claim went out, not before.

The practical trap is that adjudication runs on a compressed statutory timeline, and a respondent to a well-resourced principal will file a lengthy submission attacking your volumes, your rates, and whether the material was genuinely "rock" as defined. You will have a narrow window to reply, and an adjudicator is not obliged to chase you for evidence you should have led up front.

This is why the sequencing matters more than the drafting. Get the survey pick-ups, the excavation records, the photographs, and any independent geotechnical assessment locked down before the claim is served, not after the principal forces the fight. Treating the evidence as a prerequisite rather than a follow-up step may materially improve your position if the matter runs to adjudication.

Before you trigger the statutory timeline by serving the claim, you must understand that the principal will likely push back hard. If the dispute escalates, you will have a highly compressed timeframe to provide evidence supporting the volume and density of the material excavated. Therefore, it is often critical to engage Queensland building and construction lawyers early and secure independent geotechnical reports before responding to a hard rock variation via a formal claim. Treating this evidence gathering as a prerequisite may increase the likelihood of success if the matter progresses to adjudication.

Challenging "Written Approval Only" Clauses Under the ACL

The BIF Act and the QBCC Act are your primary Queensland weapons, but they are not your only ones. Where a restrictive variation clause sits in a standard form contract, federal consumer law may offer a second, parallel avenue of attack. When civil contractors operate as small businesses, standard form subcontracts containing onerous variation clauses may potentially face scrutiny under this federal regime. Schedule 2, section 23 of the Competition and Consumer Act 2010 — the Australian Consumer Law (ACL) — dictates that a term of a consumer contract or small business contract is void if the term is unfair and the contract is a standard form contract. Since the unfair contract terms reforms commenced on 9 November 2023, proposing, applying or relying on an unfair term in a standard form small business contract is not merely voidable but may itself be a contravention exposing the principal to pecuniary penalties.

If a principal relies on an absolute "no payment without prior written approval" clause to deny payment for work they verbally directed on site, ACCC guidance on unfair contract terms suggests that such disproportionate risk allocation might be challenged. If your business meets the statutory definition of a small business, a court or tribunal may potentially void an onerous notice clause if it operates to completely deprive you of payment for directed work. Be realistic about this threshold, however: the protections only apply where your business employs fewer than 100 people or has an annual turnover of less than $10 million, so a larger civil contractor may fall outside the regime entirely. Relying on the ACL also requires establishing that the term causes a significant imbalance in the parties' rights, and outcomes can be highly fact-dependent.

Using the Payment Schedule Deadlines to Secure a Result

Once your valid payment claim is served, the clock starts ticking relentlessly against the principal. They can no longer simply ignore your variation request or hide behind superintendent delays while your cash flow bleeds out. This section details the strict statutory deadlines the principal must now meet, and the severe financial consequences they face if they drop the ball.

Overriding Extended Payment Terms with Section 67W

Principals frequently attempt to starve civil contractors of cash flow during a Queensland construction dispute by drafting contracts with 45-day or 60-day payment terms. However, section 67W of the Queensland Building and Construction Commission Act 1991 (QBCC Act) establishes a statutory liability mechanism that directly overrides these aggressive commercial tactics.

The legislation provides that a payment provision is void to the extent it requires payment of a progress payment later than the statutory maximum after submission of a payment claim. Critically, that maximum depends on where you sit in the contractual chain: for a commercial head contract, the cap is 15 business days; for a subcontract or construction management trade contract, the cap is 25 business days.

Section 67W of the QBCC Act automatically voids any payment provision that attempts to delay a progress payment beyond the statutory maximum — 15 business days for a head contract, or 25 business days for a subcontract.

This means that even if you signed a contract agreeing to 60-day terms, the law caps the maximum payment period at 15 business days from submission of the claim if you are the head contractor, or 25 business days if you are a subcontractor. Where an offending term is struck out, the due date falls back to the statutory default under section 73 of the BIF Act, being the day stated in the contract or, if none, 10 business days after the claim is given. Either way, a variation that is correctly included in a valid payment claim cannot be artificially delayed by contract drafting.

How Section 200 Neutralises "No Statutory Claims" Clauses

Expert insight: In practice, the "no variations without written approval" clause and the security of payment regime operate on two different questions, and principals routinely conflate them. The contract governs whether you are contractually entitled to the variation. The BIF Act governs whether you have a valid statutory claim that the principal must respond to on time. A clause can win the first fight and still be irrelevant to the second.

Where this bites is when the principal has directed the work on site, taken the benefit of it, and then hides behind the written-approval clause to schedule the variation to nil. An adjudicator assessing that scenario is likely to examine whether the clause is being used to strip out a statutory entitlement for work actually performed, rather than simply to value a variation under the contract.

The tactical point is not to argue the variation purely on contractual terms in your submissions. Frame the entitlement around work directed and performed, put the site direction evidence front and centre, and let section 200 do the work of neutralising a clause that purports to shut the statutory door entirely. The stronger your evidence that the principal knew of and accepted the work, the harder it is for a bare written-approval clause to defeat the claim.

Principals often insert clauses stating that you waive all rights to claim variations unless strictly approved under their internal procedures. However, section 200 of the BIF Act creates a statutory liability mechanism that prevents parties from contracting out of the security of payment regime. The Act states that a provision of a contract, agreement or arrangement is of no effect to the extent to which it purports to exclude, limit or change the operation of this Act.

While the effectiveness of these "contracting out" prohibitions turns on whether the specific clause genuinely conflicts with the Act, adjudication under the BIF Act may often provide a pathway to value the work even when the contract appears closed. An adjudicator is likely to scrutinise whether a clause operates to completely circumvent your statutory right to a progress payment for construction work actually performed.

Deemed Liability When the Principal Fails to Issue a Section 76 Schedule

When a principal receives a valid payment claim that includes your rock variation, they face an immovable procedural mechanism: the requirement to issue a payment schedule Queensland. Section 76 of the BIF Act mandates that a respondent must respond to the payment claim by giving the claimant a payment schedule within the time required — generally the earlier of the period stated in the contract or 15 business days after the payment claim is given. Failing to meet this strict statutory deadline carries serious financial consequences for the principal.

If the principal misses the deadline to provide a valid payment schedule, the following consequences typically apply:

Deemed Liability: The principal may become statutorily liable for the full amount claimed, including the disputed rock variation.
Loss of Defences: In a subsequent application to recover the amount as a judgment debt, the principal is generally prevented from raising a defence, set-off or counterclaim under the contract. In parallel, a respondent that failed to give a payment schedule is barred from lodging an adjudication response if the claim proceeds to adjudication.
Enforcement Pathways: The contractor may recover the unpaid amount as a debt in a court of competent jurisdiction under section 78 of the BIF Act or apply for adjudication of the claim. Before pursuing recovery as a judgment debt, however, the contractor must first give the respondent a warning notice under s99 of the BIF Act, generally within 30 business days after the due date for payment.

Conclusion

You hit the rock, you followed the superintendent's verbal direction, and now the principal is attempting to make you carry a risk that was never yours to fund. If you rely solely on the contract’s variation mechanisms, you are playing a game where the principal holds all the cards—using time bars and written approval clauses to starve your cash flow while demanding continued performance.

However, as we have established, the BIF Act and the QBCC Act provide a superior statutory pathway By correctly identifying the variation work in a valid payment claim, you force the principal to formally respond within strict statutory deadlines. A failure to issue a valid payment schedule can render them liable for the full amount, cutting through much of their contractual stonewalling.

Do not wait until practical completion to fight over a half-million-dollar rock variation that threatens your MFR compliance today. The single most valuable step you can take is to have your next progress claim reviewed before it is served — while the section 68 drafting and the geotechnical evidence can still be shaped to withstand adjudication rather than after the principal has forced the fight.

This is precisely the sequencing work Merlo Law does for civil contractors. If you are staring down a disputed rock variation, contact us for a confidential consultation before your next claim goes out. Getting the claim and the evidence right the first time is far cheaper than trying to rescue a defective claim once the statutory clock has started.

FAQs

What makes a variation claim a valid statutory payment claim under Queensland law?

Under section 68 of the BIF Act, a valid payment claim must be a written document that explicitly identifies the specific civil construction work performed and the amount claimed. It must clearly separate the variation scope from the original contract works to trigger the statutory rapid payment process.

Can a principal enforce a 60-day payment term for a disputed variation?

No. Section 67W of the QBCC Act voids any payment provision that attempts to delay a progress payment beyond the statutory maximum — 15 business days for a commercial head contract, or 25 business days for a subcontract. Even if a civil contractor signed an agreement with extended terms, the law caps the maximum payment period.

What happens if a principal fails to issue a payment schedule for a rock variation?

Under section 76 of the BIF Act, if a respondent fails to provide a payment schedule within the required time, they may become liable to pay the full claimed amount. This deemed liability can often be enforced as a judgment debt, regardless of the principal's underlying contractual objections.

Can a contract completely prevent me from claiming a variation under the BIF Act?

Section 200 of the BIF Act prevents parties from contracting out of the security of payment regime. Whether a particular clause is caught turns on whether it genuinely conflicts with the Act, but where a clause operates to exclude or limit your ability to claim progress payments for construction work performed, an adjudicator may treat that specific restriction as being of no effect.

Is a verbal direction from a superintendent enough to secure payment for a variation?

While a verbal direction may support an argument for payment under unjust enrichment, standard form civil contracts typically require written approval. Relying on verbal directions increases the likelihood that a claim will face robust legal challenge, as the principal may argue the superintendent lacked the authority to approve financial variations.

Can the Australian Consumer Law help if a variation clause is too restrictive?

If a civil contractor meets the definition of a small business — generally one employing fewer than 100 people or with an annual turnover of less than $10 million — s23 of the ACL may potentially void unfair terms in standard form contracts. Onerous clauses that completely deny payment for directed work might be challenged, though outcomes depend heavily on establishing a significant imbalance in the parties' rights.

This guide is for informational purposes only and does not constitute legal advice. For advice tailored to your specific circumstances, please contact Merlo Law