Unpaid variations: your rights and the paper trail that gets you paid
Why variations go unpaid
Almost never because the work wasn't done. Variations go unpaid because of the paperwork around them: no written direction before the work started, no notice inside the contract's window, no priced claim, or a claim that arrives bundled into a progress claim months later with nothing to substantiate it.
The pattern is familiar. The site foreman is told verbally to change something. The crew does it, because that's how jobs get built. Nobody wants to be difficult about paperwork with the builder mid-project. Then at the end, the claim lands and the builder says: show me where I directed that, and show me where you claimed it on time.
What does the contract usually require?
Most Australian subcontracts run a variation regime along these lines:
- A direction — the builder or superintendent directs the change, in writing, under the variations clause.
- Your notice — you notify that the direction is (or you say it is) a variation, often within a stated number of days.
- A price — you submit the cost and any time impact, usually within a further window.
- Valuation — the contract sets out how the variation is valued: agreed lump sum, contract rates, or a cost-plus-margin method.
Two traps sit in that sequence. The first is starting work on a verbal direction — do it and you're relying on the builder's memory and goodwill. The second is a time bar on the variation notice, which works exactly like an EOT time bar: miss the window and the entitlement can be gone even though the work is in the building.
What can I claim under Security of Payment?
A variation you're entitled to is claimable like any other amount: include it in a payment claim under the applicable Security of Payment Act, and if the builder schedules it at nil or ignores it, you can take it to adjudication — inside your state's window, which the state-by-state deadlines comparison sets out. That's a fast, low-cost path compared with a court claim, and it exists precisely because the industry's default is to argue about variations until the subcontractor gives up.
A Victorian note — this changed recently. Until 15 April 2026, Victoria's Act carried an "excluded amounts" regime that kept disputed variations, delay and extension of time costs, and latent conditions out of adjudication altogether. Sections 10A and 10B were repealed with effect from that date, so all of those amounts are now claimable and adjudicable in Victoria like anywhere else. If you were told a variation dispute wasn't worth adjudicating in Victoria, that advice is out of date for any claim served on or after 15 April 2026 — though claims served before then are still governed by the old rules. Either way the paperwork still decides it: adjudication will hear the claim, but it hears it on your records. There's more detail in our guide to payment claims under the Victorian SOP Act.
The builder's template may not have caught up: see what the Victorian reform means for the next subcontract on your desk.
The paper trail that gets you paid
- Written direction first, work second. If the direction was verbal, confirm it in writing before you start: "Further to your instruction on site this morning, we understand you have directed…". A confirmation the builder doesn't dispute is worth far more than your recollection.
- Notify inside the window. Serve the variation notice the contract requires, on time, every time — not just on the big ones. Selective paperwork looks tactical; routine paperwork is just how you operate.
- Price it properly. Labour hours, plant, materials, subcontract costs, margin as the contract allows, and any program impact stated separately. A number with no build-up is easy to discount.
- Keep the site evidence. Daily diaries, photographs with dates, delivery dockets, timesheets tied to the variation. Adjudicators decide on documents.
- Claim it, then track it. Include the variation in the next payment claim, and record what the payment schedule says about it. A variation that never appears in a payment claim is very hard to argue about later.
- Watch the interaction with time. If the variation also delayed you, the EOT is a separate entitlement with its own notice — claiming the cost doesn't claim the time.
Before you sign, read the variations clause
The regime you'll be living under is set at signing, not at the first variation. Check who can direct a variation, whether a written direction is required, how long you have to notify and price, how variations are valued, and whether there's a mechanism for disputed variations to proceed while the argument runs — it sits with the other pre-signing checks in our subcontract review checklist. Where the clause is one-sided, ask for it to change in your departure schedule before you're the one holding the risk.
SubSync flags all of that in a pre-signing review, and once the job is live the contract notices module drafts the variation notice to the clause and tracks its deadline.