Claiming for Variations Under the Security of Payment Legislation

You’ve done the extra work. The head contractor agreed to it (or so you thought). Now they’re dodging your variation claim like it never happened. If you’re a subcontractor or tradie caught in this situation, you’re not alone—and the Security of Payment legislation in your state has your back.

The trick is knowing how to use it properly. Variations under Security of Payment law aren’t the same as a casual handshake agreement. There are rules, timing matters, and if you get it wrong, you could lose your right to claim altogether. Let’s walk through what you need to know.

What Counts as a Variation?

A variation is work or goods outside the scope of your original contract. That might be:

• Extra excavation because the builder hit unexpected rock
• Additional plastering or painting the site manager verbally approved
• Supply of materials not in your original quote
• Site work that wasn’t in the original scope but was instructed on-site
• Changes to timing, method, or specification

The catch? Your contract and your state’s Security of Payment Act define what counts as a variation. In NSW (under the Security of Payment Act 1999), in Queensland (under the Building Industry Fairness (Security of Payment) Act 2017), in Victoria (under the Security of Payment Act 2002), and across other states, the legislation assumes you have a contract in place. Variations exist in relation to that contract.

If there’s no written contract at all, or if the variation wasn’t part of a construction contract, the Security of Payment legislation may not apply—which is why getting evidence of agreement matters from day one.

Get Written Evidence Before You Claim

Here’s where most tradies stumble: they do the work, get a verbal okay, and assume they’re covered. Then they lodge a payment claim and the head contractor says, “Never agreed to that.”

Security of Payment Acts don’t require variations to be in writing to be valid, but they do require you to prove they existed. Without evidence, you’re arguing your word against theirs. That’s a losing position when adjudication time comes.

Before starting variation work, chase written confirmation. This could be:

1. An email or text from the site manager saying “Yes, go ahead”
2. A written variation order signed by the head contractor or their agent
3. A site diary entry or progress notes dated and signed
4. An email from you outlining the extra work, with their reply saying “Approved”
5. A formal change order or variation sheet (even a basic one)

The stronger your documentation, the harder it is for a head contractor to deny the variation later. If you’ve already done the work without written approval, photos, emails, and witness statements are better than nothing—but prevention beats cure.

Include Variations in Your Payment Claim Correctly

When you lodge a payment claim under your state’s Security of Payment Act, you need to be clear about what you’re claiming for. That means separating original contract work from variations, and explaining what each variation covers and why it’s payable.

If your claim is vague—lumping variation work into a line item with no explanation—the head contractor can argue the claim is non-compliant. Some states are stricter about this than others. NSW, Queensland, and Victoria all have specific rules about what information must be in your claim.

A solid payment claim should include:

• Original contract work itemised with reference to the contract
• Each variation listed separately with a description of the work
• The amount claimed for each variation
• Reference to any variation order, email approval, or documentation
• A statement that the claim is made under the relevant Security of Payment Act

Getting the format right matters because if the respondent (head contractor) can claim your claim is defective, they may not have to respond with a payment schedule—and that derails your right to adjudication.

Timing and Adjudication Rights

Once you’ve filed a payment claim that includes variations, the clock starts ticking for the head contractor. Under most state acts, they have a limited time to issue a payment schedule (typically 10 business days in NSW; 5 business days in Queensland; varies by state). If they don’t respond, or if they reject your variations, you can apply for fast-track adjudication.

Adjudication isn’t court—it’s faster and cheaper. An adjudicator will review your claim, their response, and your evidence (including those emails, variation orders, photos, and site notes) and issue a binding decision within a set timeframe. Many debtors choose to settle rather than face that process, but the outcome isn’t guaranteed. You have to prove your variation was agreed to and the work was done.

The variation claim process works differently across states. NSW, Queensland, Victoria, Western Australia, and South Australia all have Security of Payment Acts with slightly different rules. It’s worth checking your state’s specific deadlines and procedures.

Keep Your Paper Trail Clean

Whether you’re chasing a variation claim or a straightforward progress payment, documentation is your safety net. Site diaries, photos, emails, SMS messages, invoices, delivery dockets—all of it tells a story. When you’re in adjudication, that story either supports you or it doesn’t.

If you’re unsure whether your variation claim is compliant with your state’s Act, or if the head contractor is stonewalling, getting practical guidance on how to structure and lodge your claim makes a real difference. The Security of Payment legislation exists to protect you, but only if you use it right.

Variations aren’t always straightforward, but they’re not unclaimable either. Know your contract, document your work, and understand your state’s Security of Payment rules. That’s the foundation of a strong claim.