Most building disaster stories start the same way. An owner liked the builder, trusted their gut, and signed a contract without checking the things that are easy to check. Months later they are dealing with incomplete work, uninsured tradespeople, a disappeared deposit, or a build that does not meet the drawings.
The good news is that most of these disasters are preventable in an afternoon, before a single dollar changes hands.
Start with the licence register — not their website
Every residential builder in Australia must hold a current licence issued by their state or territory authority. This is not optional, and holding a valid licence is a legal requirement before entering a residential building contract above the relevant threshold.
Before you do anything else, search the register for your state:
| State/Territory | Register | Authority |
|---|---|---|
| Queensland | Licence search | qbcc.qld.gov.au |
| New South Wales | Licence check | fairtrading.nsw.gov.au |
| Victoria | Licence register | vba.vic.gov.au |
| Western Australia | Licence search | commerce.wa.gov.au |
| South Australia | Licence check | cbs.sa.gov.au |
| Tasmania | Registration check | cbos.tas.gov.au |
| ACT | Licence register | accesscanberra.act.gov.au |
| Northern Territory | Licence search | nt.gov.au |
Two things to check when you find them:
The name must match exactly. The name on the licence must be identical to the name on the quote, the contract, and the ABN. “Apex Building Group Pty Ltd” and “Apex Builds” are not the same legal entity. If the names do not match and the builder cannot explain it in writing, stop.
Read the disciplinary record. Every state register shows active complaints, restrictions, conditions, and past suspensions or cancellations. A single old complaint that was resolved may be nothing. Multiple complaints, active restrictions, or a recent licence suspension are serious signals.
Verify the ABN independently
The builder’s ABN is searchable in 30 seconds at abr.business.gov.au. Confirm:
- The ABN is active — not cancelled or pending
- The business name on the ABN matches the name on the quote and licence exactly
- If the builder is charging GST, confirm they are registered for GST
This step catches two common problems: builders operating under different entity names (which creates problems with insurance claims and contract enforcement), and unregistered businesses charging GST they are not entitled to collect.
Get a quote that actually commits to something
A vague quote is a vague promise. When a dispute arises about what was “included” in the price, the quote is the first document a tribunal examines. A builder who cannot provide specifics in a quote will not provide specifics anywhere else either.
A quote worth signing should specify:
- Scope broken down by stage and trade — not “build to approved plans”
- Materials specified by brand, type, and grade — not “quality tiles TBC”
- Finish levels for plastering, painting, and flooring — Level 4, Level 5, tile type, and so on
- A clear list of exclusions — what is outside the price is as important as what is in it
- Start and completion dates with a stated process for timeline variations
- The builder’s company name, ABN, licence number, and bank details on the document
A quote that is specific enough to be argued over in a tribunal is a quote that protects both parties. Vague quotes protect only the builder.
Note on SOPA references: If you see the words “Building and Construction Industry Security of Payment Act” anywhere in a quote to a residential owner-occupier, ask the builder to clarify why that legislation is referenced. SOPA is primarily a commercial construction payment mechanism. Its appearance in a residential quote can have implications for how payment disputes are handled.
Verify their insurance — and call the insurer
Every residential builder must hold Public Liability Insurance at a minimum. For projects above the relevant threshold in most states, they must also hold Home Warranty Insurance (also called Domestic Building Insurance or Home Indemnity Insurance). If they have employees or subcontractors, Workers Compensation is also required.
Ask for the Certificate of Currency for each policy. Then call the insurer directly to confirm the certificate is genuine and current — use the number from the insurer’s official website, not the number on the certificate.
Home Warranty Insurance thresholds by state:
| State | Threshold |
|---|---|
| Queensland | Over $3,300 |
| New South Wales | Over $20,000 |
| Victoria | Over $16,000 |
| Western Australia | Over $20,000 |
| South Australia | Over $12,000 |
| Tasmania | Not mandatory |
| ACT | Over $20,000 |
| Northern Territory | Owner-builders over $12,000 |
An uninsured builder leaves you personally exposed if a worker is injured on your property, if the builder’s work causes property damage, or if the builder fails to complete the job and you need to make a claim.
Check references — including ones you find yourself
A builder with three client references on their website has chosen three people to recommend them. That is not the same as an independent reference check.
Start with their online reputation: Google reviews, ProductReview, and any industry association directory for your state. Look for patterns — a single bad review may be noise, but recurring complaints about the same things (communication, delays, defects not fixed) are signal.
When you contact references the builder provides:
- Ask about communication during the build, not just the finished product
- Ask whether defects after handover were dealt with promptly
- Ask whether the build finished close to the quoted price and timeline
- Ask whether they would hire the same builder again — and why
If possible, visit a completed project in person. A finished home is a better demonstration of finish quality than a photograph.
Read the contract before you sign it
For any residential project above the relevant thresholds, a written contract is mandatory. Most builders use the HIA or MBA standard contract. Have a construction lawyer review it before you sign — an hour of their time on a $400,000 contract is one of the highest-return investments of the entire project.
Before it reaches a lawyer, check for these specific items yourself:
Liquidated damages. This clause specifies a weekly rate the builder owes you for delays they cause. A fair rate is typically $1,000–$2,000 per week for a standard residential build. If this clause is struck out, set at a token amount (like $1 per week), or missing entirely — that is a significant imbalance in the contract. You lose leverage if the build runs over time.
Payment milestones. Payments should be tied to physically verifiable stages of construction — base, frame, enclosed, fixing, completion. Not calendar dates. Not a percentage of the project. A milestone you can walk on site and confirm is complete.
Trade certificates. Your contract should require plumbing, electrical, and waterproofing compliance certificates to be provided at each relevant payment stage — not bundled at handover.
Right to inspect. You should have the explicit right to commission an independent inspection before releasing each progress payment.
Dispute resolution. The contract should reference your state tribunal — QCAT (Queensland), NCAT (NSW), VCAT (Victoria), or the equivalent — as the avenue for disputes.
Know the deposit limits
Never pay more than the legal deposit limit. Every state sets a cap on the deposit a builder can request before work starts:
| State | Maximum deposit |
|---|---|
| Queensland | 5% for contracts over $20,000 |
| New South Wales | 10% for contracts over $20,000 |
| Victoria | 5% for contracts over $20,000 |
| Western Australia | 6.5% for contracts $7,500–$500,000 |
| South Australia | 5% or $1,000 (whichever is lower) for contracts over $12,000 |
| Tasmania, ACT, NT | No legislated cap — 10% is standard |
Pressure to pay a large deposit before work begins, or early lump-sum payments well beyond these limits, is a warning sign. Overpaying a deposit can also affect your Home Warranty Insurance coverage if the builder later fails to complete the build.
Security of Payment — what you need to know
In every Australian state and territory, the Building and Construction Industry Security of Payment Act (SOPA) creates a fast-track mechanism that lets builders pursue unpaid invoices. If you receive a payment claim that specifically states it is made under the Act, you face strict response obligations.
You must respond with a written payment schedule — specifying what you will pay and why you are withholding the rest — within the timeframe set by your state’s legislation (10 business days is common, but check your state’s specific Act). If you do not respond within the timeframe, the full claimed amount can become a debt enforceable at law.
Never ignore a formal SOPA payment claim. Seek legal advice immediately.
Document everything, starting now
The most common sentence at building tribunals is “we agreed verbally.” Oral agreements are almost impossible to enforce when a builder disputes them.
From the day you decide to proceed:
- Every variation to scope, price, or timeline in writing and signed before any work starts
- Every communication that contains a commitment or agreement — saved, not deleted
- Every invoice, certificate, and receipt retained
- Every photo of site conditions, defects, and completed stages timestamped and stored
Courts and tribunals decide disputes on documentary evidence. A homeowner with a clear record of what was agreed and what was built is in a strong position. A homeowner relying on memory is not.
If something goes wrong
Contact your state building authority directly. Most offer free dispute resolution services that resolve issues without the cost and delay of tribunal:
| State/Territory | Authority |
|---|---|
| Queensland | QBCC — qbcc.qld.gov.au |
| New South Wales | NSW Fair Trading — fairtrading.nsw.gov.au |
| Victoria | Consumer Affairs Victoria / DBDRV — consumer.vic.gov.au |
| Western Australia | Consumer Protection — commerce.wa.gov.au |
| South Australia | Consumer and Business Services — cbs.sa.gov.au |
| Tasmania | CBOS — cbos.tas.gov.au |
| ACT | Access Canberra — accesscanberra.act.gov.au |
| Northern Territory | Consumer Affairs NT — nt.gov.au |
For disputes involving significant money, incomplete work, or a builder who is unresponsive — engage a construction lawyer before taking any formal action. Many offer a fixed-fee initial consultation.
Key Takeaways
- Before signing anything, verify the builder’s licence on the relevant state register and check their disciplinary history — the name on the licence must match the quote, contract, and ABN exactly
- Confirm Public Liability Insurance ($5M minimum), Home Warranty Insurance above the state threshold, and Workers Compensation are current — call the insurer directly using their official number
- A quote that cannot be argued over in a tribunal is not a quote worth signing; require specified materials, finish levels, inclusions, exclusions, and dates
- Check the contract for a liquidated damages clause at a meaningful rate, stage-based payment milestones, and the right to independent inspections before each payment
- Keep deposits within the legal limits for your state — overpaying a deposit exposes you to greater loss and can affect your Home Warranty Insurance coverage
- If you receive a payment claim marked as a SOPA payment claim, you must respond in writing within the timeframe set by your state’s Act — seek legal advice immediately
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