Builder Won't Fix Defects? Your Options in NSW

You've spotted the problem — a crack in the render, doors that won't close properly, waterproofing that's clearly failed. You've told your builder. And then: silence, excuses, or a flat refusal.

This is one of the most common and most frustrating situations in residential building. The good news is that NSW has a well-defined legal framework that protects homeowners. The bad news is that most people don't know where to start — and the steps you take in the first few weeks matter enormously.

First: understand your statutory warranty rights

Before you do anything else, it helps to know what the law already gives you.

In NSW, the Home Building Act 1989 requires that all residential building work comes with statutory warranties — minimum guarantees that apply regardless of what your contract says. The two most important:

• Major defects (structural defects, or defects that make the home uninhabitable): 6 years from the date of completion
• Other defects (non-structural issues that affect use or enjoyment): 2 years from the date of completion

"Major defect" has a specific legal meaning under the Act — it covers things like defects in load-bearing elements, waterproofing, fire safety systems, and anything that renders the home unfit to occupy. When in doubt, treat a serious defect as potentially major and act accordingly.

These warranties exist whether you're the original owner or purchased the property during the warranty period.

Step 1: Document everything before your next conversation with the builder

If you haven't done this yet, do it now — before any further contact with your builder.

Why this comes first: Whatever happens next — informal resolution, regulator complaint, or tribunal — the quality of your evidence determines your outcome. "He said, she said" disputes are notoriously hard to resolve. A clear, timestamped paper trail is not.

For each defect, you want:

• Dated photographs — multiple angles, with something in frame to show scale where relevant
• A written record of when you first noticed it — a note in your phone made at the time counts
• All prior communications — texts, WhatsApp messages, emails; export and save them now
• Notes from any verbal conversations — date, who you spoke to, what was said and agreed

Records made at the time carry far more weight than ones reconstructed months later under pressure. This is the moment to build them properly.

How to document a building defect so it holds up at tribunal →

Step 2: Send a written notice to your builder

Before escalating to any external body, you must give your builder a formal opportunity to fix the defects. This isn't just good practice — it's a legal requirement in NSW. You need to have given the builder "a reasonable opportunity" to rectify before pursuing tribunal remedies.

Write a letter or email that:

1. Identifies each defect clearly (reference your photos and dates)
2. States that the defects constitute a breach of statutory warranty under the Home Building Act 1989
3. Requests rectification within a reasonable timeframe — 21 days is typically considered reasonable for minor defects; more for complex structural work
4. States that if the builder fails to rectify, you will escalate to Building Commission NSW and/or NCAT

Send it in writing — email creates a timestamped record and is sufficient. If you send a physical letter, use registered post so delivery can be proved.

Keep a copy of everything.

Step 3: Lodge a complaint with Building Commission NSW

If your written notice is ignored, or the builder refuses to act, your next step is Building Commission NSW.

A note worth flagging: this function used to sit with NSW Fair Trading's Home Building Service. It transferred to Building Commission NSW in 2023. A lot of content online still points to Fair Trading — if you follow those guides, you're in the wrong place.

Building Commission NSW handles complaints about licensed builders and can issue a Rectification Order requiring the builder to fix the defective work.

To lodge a complaint:

1. Go to buildingcommission.nsw.gov.au
2. Prepare your documentation: contract, photos, written notice and any builder response, dates, description of work
3. Lodge online or call 13 32 20

What happens after lodgement:

• An inspector may attend the property to assess the defect
• If the complaint is substantiated, Building Commission NSW can issue a Rectification Order with a set deadline for the builder to comply

This pathway works best when the builder is still licensed and operating. If the builder has become insolvent or abandoned the project, see the HBCF section below.

Step 4: Apply to NCAT for a formal order

If Building Commission NSW cannot resolve the matter — or if you need a legal order (for example, to claim costs of repairs you've already arranged, or where the builder is non-compliant) — you can apply to the NSW Civil and Administrative Tribunal (NCAT), Consumer and Commercial Division.

NCAT can:

• Order the builder to carry out rectification works
• Order the builder to pay compensation equal to the cost of having defects fixed by another contractor
• Award damages for consequential losses in some circumstances

NCAT is designed for self-representation. You don't need a lawyer, though independent legal or building advice before a complex hearing is worth considering.

Important: Time limits apply. For statutory warranty claims the limitation period is tied to the warranty period itself. Don't wait to see how things develop — lodge before the clock runs out.

Full step-by-step guide to taking your builder to NCAT in NSW →

What if your builder is insolvent or has disappeared?

If the builder is no longer operating, the framework changes. The Home Building Compensation Fund (HBCF) — formerly known as Home Warranty Insurance — is a last-resort scheme that may cover you for incomplete or defective work where the builder has died, become insolvent, or had their licence suspended.

HBCF cover is mandatory for most residential building contracts over $20,000. You should have received a certificate of insurance when you signed the contract. If the builder didn't obtain cover, or it lapsed, you may still have options — but the process is more complex and you should get legal advice.

What if the defect is an immediate safety risk?

If the defect poses a risk to health or safety — structural failure, live electrical fault, sewage, flooding — you may be justified in having urgent work done and claiming the cost from the builder later. If you act, document everything before and after, retain all invoices, and notify the builder in writing of what you did and why as soon as possible.

The mistake that costs people the most

The most common mistake isn't failing to know the law. It's escalating to a regulator or seeking legal help before building a clear record.

Officers at Building Commission NSW, inspectors, and tribunal members work from evidence. If you arrive with a clear, timestamped record — photos, written notices, builder responses — you start from a position of strength. If you arrive saying "I mentioned it verbally a few times," you're starting from nowhere.

The record you build in the early stages is often the deciding factor in how a defect dispute ends.

Your order of operations

1. Document the defect — photos, dates, existing communications
2. Send a written notice to the builder requesting rectification within 21 days
3. Lodge a complaint with Building Commission NSW if the builder fails to respond or refuses
4. Apply to NCAT if the complaint process doesn't resolve it, or if you need a formal order
5. Check HBCF cover if the builder is insolvent or gone

Each step creates a record that supports the next. Start early, put it in writing, and keep everything.

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The owners who navigate defect disputes most effectively are rarely the ones who know the most about building law. They're the ones who kept a clear record throughout the build — so when something went wrong, they already had the evidence ready.

Chronicle Build helps Australian homeowners do exactly that: connect your build communications, track milestones, and generate a dispute-ready bundle if you ever need it.

Join the Chronicle Build early access waitlist →

Frequently asked questions

How long do I have to make a claim for building defects in NSW?

Under the Home Building Act 1989, the limitation period for major defects (structural or rendering the home uninhabitable) is 6 years from completion. For other defects it's 2 years. Because these deadlines are strict, don't wait — document early and act before time runs out.

Does my builder have to come back and fix defects after practical completion?

Yes. NSW statutory warranties require your builder to fix defects that breach those warranties within the relevant warranty period, regardless of what the contract says. Giving the builder a written chance to fix the work is required before escalating to Building Commission NSW or NCAT.

What is Building Commission NSW and how is it different from Fair Trading?

Building Commission NSW is the specialist building regulator in NSW that now handles home building complaints — a function previously held by NSW Fair Trading's Home Building Service. If older guides tell you to lodge with Fair Trading, they're out of date. Lodge at buildingcommission.nsw.gov.au.

Can I get someone else to fix the defect and bill my builder for the cost?

Generally you need to give the builder a reasonable written opportunity to fix the work first. If the situation is a genuine emergency (risk to health or safety), you may be justified in acting immediately and claiming costs — but document everything before and after, and notify the builder in writing as soon as possible.

What if my builder has gone out of business or become insolvent?

Check whether the builder obtained Home Building Compensation Fund (HBCF) insurance — you should have received a certificate of insurance when you signed the contract. HBCF is a last-resort scheme that may cover defective or incomplete work when the builder has died, become insolvent, or had their licence suspended.