The Money You're Leaving on the Table: Variations and EOT Claims Every Queensland Subcontractor Gets Wrong

A Structura field guide for subcontractors who are tired of doing the work and absorbing the cost.

You priced the job. You won the job. You did the job — plus the extra the head contractor asked for on the phone, plus the three weeks you sat idle waiting on a slab that wasn't your fault. Then the final claim lands short, the variations get knocked back, and somewhere in the fine print there's a liquidated damages deduction for a delay you didn't cause.

Here's the uncomfortable truth: most of that money didn't vanish because you were owed nothing. It vanished because of how and when you asked for it. Variations and extension-of-time (EOT) claims are the two largest pools of recoverable money on almost any subcontract — and they're also the two most commonly forfeited, usually on a technicality you could have beaten with a single email sent on the right day.

This guide breaks down exactly where that money leaks, why the contract is built to make you forfeit it, and the legal leverage Queensland subbies have but rarely use.

A quick note: This is general information, not legal advice. Every contract is different, and the difference between recovering and forfeiting often comes down to the precise wording of your clauses. When real money is on the line, get your contract reviewed before you sign — and your claim reviewed before you serve it.

Why variations are where subbies bleed the most

A variation is simply a change to the scope you originally priced — extra work, different materials, a different sequence, a redesign. On paper, you do the extra and you get paid the extra. In practice, two things quietly strip that entitlement away.

1. The verbal instruction trap

A project manager you've worked with for years calls you, or grabs you at the toolbox meeting, and says: "Mate, just do it, we'll sort the paperwork later." You do it. You price it honestly into the next progress claim. And then it gets disputed — because almost every standard commercial and domestic contract requires variations to be approved in writing before the work proceeds.

A verbal "go ahead" frequently fails to satisfy that contractual precondition. Proceed on a handshake and you can sever your own legal right to claim the additional amount, no matter how genuine the instruction was. The relationship that felt like protection is the exact thing that costs you, because the moment the commercial position shifts, goodwill evaporates and the contract is all that's left.

The fix is unglamorous and bulletproof: never let a verbal instruction stay verbal past the end of the day. A short confirming email — "Confirming your instruction today to [do X]; we're treating this as a variation and will price it in our next claim" — converts a handshake into a written record. You don't need their signature on a formal variation order to build a paper trail that an adjudicator will respect. You need contemporaneous written evidence that the instruction was given.

2. The time bar that quietly extinguishes a valid claim

Standard Australian contracts — particularly the AS 4000 and AS 2124 families — carry time bars: clauses that make your right to claim a variation or EOT conditional on giving written notice within a fixed window. That window is often 28 days, but it can be far shorter. Some subcontracts compress it to a handful of days because the head contractor has to assess your notice and pass its own notice up the chain to the principal in time.

Miss the window and, in many cases, the claim is gone. Not reduced — gone. Australian courts have historically enforced clearly drafted time bars even where the result is harsh, on the principle that they won't rewrite a bargain struck between two commercial parties. The original purpose of the time bar was sensible: flush issues out early so they can be managed. In practice it has hardened into a complete defence that head contractors use to defeat otherwise legitimate claims.

The lesson is simple and brutal: the validity of a six-figure claim can turn on whether an email went out on day 27 or day 29. A claim that is late, or served in the wrong form, can be rejected on procedure alone, before anyone even looks at the merits.

EOT: the silent killer wired to your liquidated damages

An extension of time claim adjusts the date for completion when a qualifying delay event hits — bad weather beyond the norm, latent site conditions, late or defective drawings, head-contractor-caused disruption, and so on. Subbies treat EOT as paperwork. It isn't. It's the only thing standing between you and liquidated damages (LDs) — the per-day penalty the head contractor deducts for finishing late.

Here's the trap most subcontractors walk into: the date for completion passes quietly, nobody claims an EOT, everyone keeps working. Then variations get ordered after that date. You claim the variation money. And suddenly the head contractor reaches for LDs, arguing you finished late — using your own missed EOT claims against you.

This is exactly the scenario the courts have looked at. In Probuild v DDI, a plasterboard subcontractor finished 144 days past the completion date and had not lodged timely EOT claims or followed the strict variation notice procedures. The head contractor tried to set off liquidated damages. The subcontractor still came out ahead on a substantial security-of-payment claim — because the variations had been directed after the completion date, and it was found unreasonable for the head contractor to refuse an extension in those circumstances.

The principle underneath that result is centuries old and worth tattooing on the inside of every subbie's eyelids: the prevention principle. A party can't penalise you for a breach it caused. If the head contractor (or the principal) is the reason you couldn't finish on time, they generally can't levy liquidated damages for that period of delay — and where a contract gives them a unilateral power to extend time, courts have held they must exercise it for delays they caused, sometimes via an implied duty of good faith.

But — and this matters — don't bet the business on the prevention principle bailing you out. It's a backstop, not a strategy. Some contracts hand the head contractor an "absolute discretion" over EOTs, and where that language is clear, courts have declined to interfere even where the subcontractor was prevented from finishing on time. The disciplined move is to claim your EOTs properly and on time, every time, so you never have to rely on a judge reading good faith into a clause that may not contain it.

The Queensland leverage subbies forget they have

Now the part that should change how you negotiate. The contract is drafted to tilt against you — but in Queensland, the Building Industry Fairness (Security of Payment) Act 2017 (the BIF Act) sits on top of your contract and overrides large parts of it. You can't contract out of it. Three provisions in particular are weapons most subcontractors leave in the drawer.

1. "Pay when paid" clauses have no effect. If your contract says you only get paid once the head contractor gets paid by the developer, that term is legally dead in Queensland. Section 74 of the BIF Act voids any provision that makes your payment contingent on a third party paying someone higher up the chain. A head contractor cannot lawfully push the developer's cash-flow risk onto you.

2. Payment timeframes are capped — hard. Under the Queensland regime, a subcontract or trade contract provision requiring payment later than 25 business days after your payment claim is invalid for building work. If a head contractor tries to trade you a fat variation sum in exchange for accepting 45-day terms, that extended payment term is void from the moment it's signed. You keep the variation money and the statutory timeframe.

3. You have a statutory right to progress payments — even if the contract is silent. A payment claim can be a properly framed invoice. Serve it on or after the reference date and within six months of when you last carried out the work (section 75). The respondent then has 15 business days to issue a payment schedule. Miss that schedule, and the head contractor can become liable for the full claimed amount — which is where adjudication, the fast-track recovery mechanism, becomes your most powerful card.

One operational warning that has sunk valid claims: serve your documents as an attachment — a PDF or Word file — not a link. Queensland courts have treated link-only "service" as potentially invalid. Don't lose a claim because you sent a download URL instead of the document.

There's also a shifting tailwind worth knowing about. Since the November 2023 expansion of the Unfair Contract Terms regime under the Australian Consumer Law, unreasonably onerous time bars in standard-form small-business contracts are increasingly open to challenge. Western Australia has already legislated to let adjudicators strike out unfair notice-based time bars. The ground is moving in the subcontractor's favour — but slowly, and case by case. Don't wait for the law to save you. Build the systems that make the law irrelevant to your outcome.

The Structura method: a five-step variation & EOT discipline

Recovering this money isn't about being aggressive. It's about being systematic before the head contractor is. Here's the framework we run with subcontractor clients.

1. Confirm every instruction in writing the same day. No verbal variation survives past 5pm without a confirming email. This single habit recovers more money than any other.
2. Diarise your notice deadlines the day you sign. Pull every time bar — variation notice, delay notice, EOT claim — out of the contract before work starts and load the dates into a tracker with reminders set days early. You manage the calendar, not your memory.
3. Notify delay early, even when the impact is unknown. You don't need the full extent of a delay to lodge a notice. Get the short, in-time notice out to preserve the claim, then follow with detail. A timely placeholder beats a perfect claim served two days late.
4. Build the evidence as you go, not at the end. Site diaries, dated photos, RFIs, programmes showing critical-path impact. The subbie who can link a delay event to a completion-date impact with contemporaneous records wins; the one relying on memory and goodwill loses.
5. Pressure-test the claim before you serve it. Right amount, right form, right reference date, within the statutory window, served as an attachment. A claim rejected on procedure is money handed back voluntarily.

What this is actually costing you

Run the numbers on your last twelve months. One forfeited variation a quarter at a few thousand dollars each. One EOT you didn't claim, turned into weeks of liquidated damages you absorbed. A handful of progress claims paid late because nobody pushed the BIF Act timeframes. For most subcontractors, the annual leak runs well into five — sometimes six — figures. That's not bad luck. That's an unmanaged contract.

The head contractors who deduct it from you aren't smarter than you. They're just more disciplined about paperwork, deadlines, and the contract than you've had time to be while actually building the thing. That asymmetry is the whole game — and it's entirely fixable.

Structura closes that gap. We review fixed-price subcontracts before you sign, map every time bar and notice obligation into a system you can actually run on site, and make sure the money you earn is the money you keep. If you've ever finished a job wondering where the margin went, that's the conversation to have.

Want your next contract pressure-tested before you sign it? Get in touch with Structura for a fixed-price contract review built for Queensland subcontractors. Stop leaving money on the table.

Sources & further reading

• Building Industry Fairness (Security of Payment) Act 2017 (Qld).
• Queensland Building and Construction Commission Act 1991 (Qld).
• Probuild Constructions (Aust) Pty Ltd v DDI Group Pty Ltd [2017] NSWCA 151.
• Growthbuilt Pty Ltd v Modern Touch Marble & Granite Pty Ltd [2021] NSWSC 290.
• Australian Competition and Consumer Commission. (2023). Unfair contract terms reforms. Australian Consumer Law.
• Holding Redlich. (n.d.). Security of Payment QLD – Legal guide.
• Queensland Government. (n.d.). Payments in the building industry. Business Queensland.
• Standards Australia. AS 4000-1997 and AS 2124-1992 General conditions of contract.

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This article reflects the law as understood at the time of writing and is provided for general information only. It is not legal advice and should not be relied upon as such. Obtain advice specific to your contract and circumstances before acting.