When Builders Won't Pay, You Have a Statutory Right
Security of payment variation claim disputes are one of the most common reasons Australian subcontractors end up in the adjudication system — and one of the most winnable, if your documentation is in order. Every state and territory in Australia has legislation designed to ensure that people who do construction work get paid for it. When a builder disputes or ignores your variation claim, this legislation is your most powerful tool — faster than litigation, cheaper than arbitration, and specifically designed for situations exactly like yours.
Yet most subcontractors I talk to either don't know the system exists, or think it's only for big companies with lawyers. It's not. The Security of Payment framework was built for subbies. Here's how it works.
What Is Security of Payment Legislation?
Security of Payment (SOPA) legislation creates a statutory right to progress payments for anyone who carries out construction work or supplies related goods and services under a construction contract. It operates alongside your contract — meaning it doesn't replace your contractual rights, but provides an additional, rapid pathway to payment when those rights are being ignored.
The core mechanism works like this:
- You serve a payment claim identifying the work done and the amount claimed
- The respondent (builder) must provide a payment schedule within a fixed timeframe, stating what they'll pay and why
- If they don't respond, or you dispute their response, you can apply for adjudication
- An adjudicator makes a binding determination — typically within 10–15 business days
- The determination is enforceable as a judgment debt if not paid
The entire process — from payment claim to enforceable determination — can take as little as 4–6 weeks. Compare that to 12–18 months for litigation.
How Variations Fit Into SOPA Claims
This is where many subcontractors get confused. Can you include disputed variations in a payment claim under SOPA? Yes — absolutely.
A payment claim under SOPA can include any amount you believe is owed for construction work carried out. That includes:
- Contract work — progress claims for work within the original scope
- Variation work — additional or changed work, whether approved or disputed
- Delay and disruption costs — if your contract provides an entitlement
- Retention release — if the conditions for release have been met
The key is that you must genuinely believe you're entitled to the amount claimed, and the claim must relate to construction work carried out under a construction contract. A disputed variation that you performed in good faith — based on a direction, changed conditions, or additional scope — absolutely qualifies.
Critical point: The adjudicator decides based on the evidence before them. If your variation is poorly documented, the adjudicator may not be able to award it — regardless of whether the work was actually done. This is why contemporaneous documentation is everything in SOPA adjudication.
The Payment Claim → Payment Schedule → Adjudication Pathway
Step 1: Serve a Valid Payment Claim
A payment claim must:
- Be in writing
- Identify the construction work (or related goods and services) to which the claim relates
- State the amount claimed
- State that it is made under the relevant Act (e.g., "This is a payment claim made under the Building and Construction Industry Security of Payment Act 2002 (Vic)")
- Be served on the person liable to make payment
For variation claims specifically, break out each variation as a separate line item with:
- The variation number and description
- The date the variation was identified and noticed
- The contractual basis for the claim (clause reference)
- The amount claimed with supporting breakdown
- Reference to any direction, instruction, or changed condition
Step 2: Wait for the Payment Schedule
After receiving your payment claim, the respondent must provide a payment schedule within the timeframe set by the contract, or the relevant Act's default (typically 10–15 business days, depending on the state).
The payment schedule must:
- Identify the payment claim to which it responds
- State the amount the respondent proposes to pay (the "scheduled amount")
- If the scheduled amount is less than the claimed amount, state why — with reasons for each item withheld
If no payment schedule is provided: The respondent is liable to pay the full claimed amount. You can either recover the debt directly (through the courts) or proceed to adjudication. This is one of the most powerful features of SOPA — silence is not a defence.
Step 3: Apply for Adjudication
If the scheduled amount is less than the claimed amount, or if the scheduled amount is not paid by the due date, you can apply for adjudication. The application must be made within specific timeframes (which vary by state — see below).
The adjudication application includes:
- A copy of the payment claim
- A copy of the payment schedule (if one was provided)
- A copy of the construction contract
- Your submissions — this is where you present your case for each disputed item
- All supporting documentation — photos, emails, site diaries, notice letters, cost breakdowns
This is where documentation wins or loses: The adjudicator typically has 10 business days to make a determination. They're reviewing everything cold. If your variation claim is supported by a clear notice, photographic evidence, contemporaneous records, and a detailed cost breakdown, you're in a strong position. If it's "we did extra work and here's a round number" — you're going to lose.
Step 4: Adjudicator's Determination
The adjudicator reviews both parties' submissions and makes a determination on the amount payable. Key points:
- The determination is binding in the interim — it must be paid, even if the parties later resolve the dispute differently
- It's enforceable as a judgment debt if not paid within the required timeframe
- The adjudicator can only consider reasons and evidence included in the payment schedule and submissions — no new reasons can be raised later
- The respondent bears the adjudication costs if they fail (in most states)
State-by-State Guide
Victoria — Building and Construction Industry Security of Payment Act 2002
Victoria's SOP Act is one of the most subcontractor-friendly in Australia:
- Payment claim timing: Can be served on or after the reference date (typically the last day of each month, or as specified in the contract)
- Payment schedule deadline: The earlier of the time required by the contract, or 10 business days after the payment claim is served
- Adjudication application deadline: Within 10 business days after receiving the payment schedule (or after the deadline for providing one passes)
- Adjudication determination: Within 10 business days of the adjudicator accepting the application (extendable to 15 with consent)
- Key feature: Claimants can make multiple payment claims for the same reference date if the earlier claim was not adjudicated. This gives you a second chance to get the paperwork right.
The Victorian Building Authority (VBA) administers the Act. Authorised Nominating Authorities (ANAs) appoint adjudicators — you apply through an ANA, not the VBA directly.
Queensland — Building Industry Fairness (Security of Payment) Act 2017
Queensland's BIF Act replaced the earlier BCIPA and introduced significant reforms:
- Payment claim timing: Can be served at any time after work is carried out (no reference date requirement)
- Payment schedule deadline: Within 15 business days after the payment claim is served (or as specified in the contract, but not less than 15 business days)
- Adjudication application deadline: Within 10 business days after receiving the payment schedule
- Key features: The BIF Act introduced Project Bank Accounts (PBAs) for government projects over $1M, providing additional payment security. It also includes provisions for "supporting statement" statutory declarations.
The Queensland Building and Construction Commission (QBCC) administers the Act and acts as the sole Adjudication Registry.
New South Wales — Building and Construction Industry Security of Payment Act 1999
NSW was the first Australian state to introduce SOPA legislation and has the most mature adjudication framework:
- Payment claim timing: On or after the reference date (last day of the named month in the contract, or last day of each month by default)
- Payment schedule deadline: Within 10 business days after the payment claim is served (or as specified in the contract)
- Adjudication application deadline: Within 10 business days after receiving the payment schedule (or after the deadline passes)
- Key feature: NSW has the highest volume of adjudication applications in Australia, meaning there's extensive case law and established precedent for common variation disputes. Adjudicators are experienced with variation claims.
Multiple ANAs operate in NSW, giving claimants a choice of nominating authority.
Other States
All other states and territories have equivalent legislation:
- Western Australia: Building and Construction Industry (Security of Payment) Act 2021 — modernised framework effective from 2022
- South Australia: Building and Construction Industry Security of Payment Act 2009
- Tasmania: Building and Construction Industry Security of Payment Act 2009
- ACT: Building and Construction Industry (Security of Payment) Act 2009
- Northern Territory: Construction Contracts (Security of Payments) Act 2004
While the principles are similar, timeframes and specific requirements vary. Always check the Act that applies to the state where the construction work is being carried out — not where your company is registered.
What Wins Adjudication for Variation Claims
After 15 years of watching variation disputes play out on construction projects, there's a clear pattern in what wins and what loses in adjudication. It comes down to documentation — every time.
Strong Claims Have:
- Contemporaneous notice — sent within the contractual timeframe, referencing the correct clause
- Photographic evidence — timestamped photos of the conditions or work, taken at the time
- Written instructions or directions — emails, RFI responses, or confirmed verbal instructions
- Detailed cost breakdowns — labour hours, material quantities, plant records, with supporting documentation
- A clear contractual basis — the specific clause that creates the entitlement, with analysis of how the facts satisfy the clause requirements
- A well-maintained variation register — showing the complete history of the claim from identification to submission
Weak Claims Have:
- No contemporaneous notice — or notice sent weeks/months after the event
- Round-number costings with no breakdown
- Reliance on verbal agreements with no written confirmation
- Missing or incomplete site records
- No clear link between the claimed amount and the actual work performed
An adjudicator who's reviewing your submission cold, with a 10-day turnaround, needs to be able to follow the thread from "here's what changed" to "here's what it cost" to "here's why you owe me." Make it easy for them and you'll get paid.
Common Mistakes in SOPA Variation Claims
1. Serving an Invalid Payment Claim
If your payment claim doesn't comply with the Act's requirements (missing the statutory endorsement, not identifying the work, or not stating the amount), it may be found invalid — and your entire adjudication application falls over. Use a proper template and check every requirement.
2. Missing the Application Deadline
The timeframes for applying for adjudication are strict and non-extendable. If you miss the 10-business-day window, you lose the right to adjudicate that particular payment claim. You may be able to serve a fresh payment claim and start again — but you've lost time and momentum.
3. Not Including Enough Supporting Evidence
The adjudicator can only decide based on what's in front of them. If you don't include photos, records, or cost breakdowns in your adjudication application, you can't provide them later. Put everything in — more is better than less.
4. Bundling Variations Without Separation
Each variation should be separately identified, costed, and supported. Bundling multiple variations into a single lump sum makes it easy for the respondent to challenge the entire amount and hard for the adjudicator to award partial amounts.
When to Use SOPA vs Other Options
SOPA adjudication is ideal when:
- The amount in dispute is significant enough to justify the application fee (typically $500–$5,000 depending on claim size)
- You have strong contemporaneous documentation
- Good-faith negotiation has failed
- You need a rapid resolution — not a 12-month court process
- The relationship has already deteriorated, or the project is complete/near complete
It's less ideal when:
- The dispute is genuinely complex (multiple variations, counterclaims, liquidated damages setoffs)
- Your documentation is weak — adjudication won't fix a bad paper trail
- You want to preserve a valuable long-term relationship (adjudication can be adversarial)
In many cases, simply serving a properly formatted payment claim — with the statutory endorsement — is enough to get a builder to take your variation claim seriously. They know what comes next if they don't respond properly.
Build the documentation that wins adjudication — automatically.
Variation Shield captures every variation with timestamped photos, formal notices, and cost breakdowns — exactly what adjudicators need to award your claim.