What Evidence Do You Need to Prove Defective Work in a Tribunal?

Tribunals decide disputes on evidence, not emotion. If you are claiming a tradie, builder, or contractor did defective work, you must prove it. That means showing what was promised, what was delivered, and why the work falls short.

This guide explains the evidence you need to prove defective work in a tribunal, how to organise it, and how to present it in a witness statement that supports your case.

What “defective work” means under Australian law

Australian Consumer Law requires services to be provided with due care and skill. If a tradesperson or contractor fails to meet that standard, the work is defective.

Services must be:

• Rendered with due care and skill
• Fit for the purpose you specified
• Delivered within a reasonable time (if no time was agreed)

If the work does not meet these guarantees, you are entitled to a remedy — repair, replacement, refund, or compensation for the cost of rectification.

The tribunal will not simply take your word for it. You must prove the work was defective, that it caused loss or damage, and that the amount you are claiming is reasonable.

The core evidence you need

1. Photos and videos

Visual evidence is the most powerful tool in a defective work case. Photos and videos show the tribunal exactly what went wrong.

What to photograph:

• The defective work itself (close-up and wide shots)
• Damage caused by the defective work (water damage, cracked tiles, unsafe wiring)
• The work site before, during, and after the job (if available)
• Any materials used that were substandard or incorrect
• Comparison shots of what was promised versus what was delivered

Best practice:

• Take multiple angles of each defect
• Include something for scale (a ruler, coin, or your hand)
• Use good lighting — natural light is best
• Date-stamp photos if possible, or note the date separately
• Do not edit or crop photos in a way that misrepresents the defect

If the defect is structural, electrical, or plumbing-related, video can be useful to show movement, leaks, or flickering lights.

2. Expert reports

An expert report is an independent assessment of the defective work by a qualified professional in the same trade. It carries significant weight in tribunal proceedings.

What an expert report should include:

• The expert’s qualifications and experience
• A description of the work inspected
• Identification of specific defects and how they breach industry standards
• Reference to relevant Australian Standards where applicable
• An opinion on whether the work was performed with due care and skill
• The cost to rectify the defects

Who can provide an expert report:

• A licensed builder, electrician, plumber, or other qualified tradesperson
• A building inspector or certifier
• An engineer (for structural defects)

The expert must be independent — not a mate, not someone you hired to fix the work, and not someone with a financial interest in the outcome.

Expert reports typically range from $300 to $1,500 depending on complexity. Some tribunals allow you to claim this cost if you win.

3. Quotes for rectification

You need to prove what it will cost to fix the defective work. This is your loss, and it is what you claim in the tribunal.

What a rectification quote should include:

• A detailed breakdown of the work required to fix the defects
• The cost of materials and labour
• A timeline for completion
• The name, licence number, and contact details of the quoting tradesperson

Best practice:

• Get at least two quotes from licensed tradespeople
• Make sure the quotes specifically address the defects identified in the expert report
• Do not get quotes from unlicensed or uninsured contractors
• If the quotes vary significantly, be prepared to explain why you chose one over the other

If you have already paid to fix the work, include the invoice and proof of payment instead of quotes.

4. The original contract or agreement

The contract shows what was promised and what you paid for. If there is no written contract, you can still prove the agreement through:

• Text messages or emails discussing the scope of work
• A quote or estimate provided before the work began
• Invoices or receipts
• Your own notes or diary entries made at the time

The tribunal will compare what was agreed to what was delivered. If the work falls short, that is evidence of a breach.

5. Correspondence with the contractor

Any communication you had with the contractor about the defects is relevant evidence. This includes:

• Emails or texts where you raised concerns about the work
• The contractor’s response (or lack of response)
• Any promises to fix the work
• Refusal to return to site or refund payment

This shows you gave the contractor an opportunity to remedy the defect before filing in the tribunal — which is typically required under consumer law.

6. Proof of payment

You need to prove you paid for the defective work. This can be:

• Bank statements showing the transfer
• Receipts or invoices
• Cheque stubs
• Cash payment receipts (if signed by the contractor)

If you paid in cash without a receipt, you can still give evidence about the payment in your witness statement, but it is weaker evidence.

How to present your evidence in a witness statement

A witness statement is your sworn account of what happened. It is the narrative that connects all your evidence together.

Structure of a witness statement for defective work:

1. Introduction — who you are, your address, and your relationship to the dispute
2. The agreement — what work was contracted, when, and for how much
3. The defective work — what went wrong, when you discovered it, and how it breached the agreement
4. Steps taken to resolve — what you did to give the contractor a chance to fix it
5. Expert evidence — reference to the expert report and what it found
6. Rectification cost — reference to the quotes and why the amount claimed is reasonable
7. Loss and damage — any additional loss caused by the defect (e.g., temporary accommodation, lost rent)
8. Conclusion — a summary of what you are claiming and why

Attach your evidence as exhibits:

• Exhibit A: Contract or agreement
• Exhibit B: Photos of defective work
• Exhibit C: Expert report
• Exhibit D: Rectification quotes
• Exhibit E: Correspondence with contractor
• Exhibit F: Proof of payment

Each exhibit should be clearly labelled and referenced in your witness statement.

ClaimDone’s Witness Statement service helps you structure your evidence properly, generate a tribunal-ready witness statement, and attach your exhibits in the correct format.

Common mistakes that weaken your case

Not getting an expert report. Saying “the work is dodgy” is not enough. The tribunal needs an independent expert to confirm it.

Poor quality photos. Blurry, dark, or poorly angled photos do not help. Take clear, well-lit images from multiple angles.

Exaggerating the defect. Stick to the facts. If you overstate the problem, the tribunal may doubt your entire case.

Claiming unreasonable rectification costs. If your quote is double what the tribunal considers reasonable, you may only recover part of your claim.

Not giving the contractor a chance to fix it. You must typically give the supplier a reasonable opportunity to remedy the defect before claiming compensation. If you did not, the tribunal may reduce your claim.

Filing without organising your evidence. Turning up to a hearing with a shoebox of receipts and no witness statement is a fast way to lose.

What happens if the contractor disputes your evidence?

The contractor may argue:

• The work was done to an acceptable standard
• You caused the defect yourself (e.g., by interfering with the work)
• The defect was pre-existing
• The rectification cost is inflated

This is why independent expert evidence is critical. The tribunal will prefer the opinion of a qualified expert over the self-serving evidence of either party.

If the contractor brings their own expert, the tribunal will compare both reports and decide which is more credible.

How ClaimDone helps you prepare your evidence

Proving defective work in a tribunal requires careful preparation. ClaimDone’s AI-powered Witness Statement service helps you:

• Structure your evidence in a clear, logical sequence
• Draft a witness statement that references your photos, expert report, and quotes
• Attach exhibits in the correct format for tribunal filing
• Ensure your statement complies with the rules of evidence in your state

You upload your evidence, answer a few questions, and ClaimDone generates a professionally formatted witness statement ready for tribunal filing.

Final checklist before filing

Before you file your tribunal application, make sure you have:

• [ ] Clear photos of the defective work
• [ ] An independent expert report identifying the defects
• [ ] At least two rectification quotes from licensed tradespeople
• [ ] The original contract or evidence of the agreement
• [ ] Correspondence showing you gave the contractor a chance to fix the work
• [ ] Proof of payment
• [ ] A witness statement that ties all the evidence together

If any of these are missing, your case is weaker. Take the time to gather everything before you file.

Ready to file your tribunal claim?

If you have defective work and the contractor will not fix it, the tribunal is your remedy. ClaimDone’s Tribunal Application service prepares your entire application — including your witness statement, evidence bundle, and all required forms — in under 60 minutes. Flat fee. No subscription. Australia-wide.

Frequently Asked Questions

Do I need an expert report to prove defective work in a tribunal?

Not legally required, but highly recommended. An independent expert report from a qualified tradesperson carries significant weight and is often the difference between winning and losing a defective work claim.

Can I use photos taken on my phone as evidence?

Yes. Phone photos are acceptable as long as they are clear, well-lit, and show the defect from multiple angles. Include something for scale and note the date the photos were taken.

How many rectification quotes do I need?

At least two quotes from licensed tradespeople. This shows the tribunal that your claimed rectification cost is reasonable and market-based.

What if I already paid someone else to fix the defective work?

You can claim the cost of rectification if you have already paid to fix it. Include the invoice, proof of payment, and photos of the rectified work as evidence.

What happens if the contractor says the work was fine?

The tribunal will weigh your evidence against theirs. This is why independent expert evidence is critical — the tribunal will prefer an expert opinion over either party’s self-serving claims.