Builder dispute in New Zealand, your rights when building work goes wrong

Last updated 4 July 2026. Tribunal limits and fees checked at that date. This is general information, not legal advice.

Bad building work sits in a special category of misery, it is expensive, it is your home, and the person responsible has your money. The law is more on your side than most homeowners realise, and a January 2026 change made enforcing it dramatically cheaper. This guide covers the automatic 10 year warranties, the 12 month window where the burden of proof favours you, and the ladder of remedies from a stern letter to the courtroom.

The 10 year warranties you get automatically

Every residential building contract in New Zealand contains warranties written by Parliament, whether the contract mentions them or not, and even where nothing was ever put in writing. Under section 362I of the Building Act 2004, the builder warrants that the work will be done with reasonable care and skill and in accordance with the plans and the building consent, that the materials will be suitable and new unless agreed otherwise, that the work will comply with the Building Code and be completed in reasonable time, and that the home will be suitable for occupation.

Three features give these warranties their teeth. They cannot be contracted out of. They can be enforced by people who were not party to the contract, so if you buy a five-year-old house with a defective renovation, you inherit the warranty claim against the builder. And claims can be brought for 10 years from the work, the Act’s long-stop limit. The Consumer Guarantees Act adds a parallel guarantee that building services be carried out with reasonable care and skill, which cannot be excluded for consumers either.

If a warranty is breached, the Act gives you a right to have the defect remedied, damages for losses, and for substantial breaches, cancellation. How long is a builder liable for their work in New Zealand, in short, 10 years.

First moves when you find bad work

1. Document everything. Photos with dates, videos, the contract or quotes and invoices, texts and emails. Evidence ages badly, collect it now.
2. Tell the builder in writing. Describe each defect specifically, ask for it to be remedied, and give a reasonable deadline. Email is fine. This letter is the foundation of every later remedy.
3. Get an independent report for anything serious. A building surveyor’s report costs several hundred to a couple of thousand dollars, turns your complaint from opinion into evidence, and its cost can form part of your claim.

The 12 month defect period

The first year after completion is your window of maximum power, and most homeowners have never heard of it. Under section 362Q of the Building Act, if you give the builder written notice of a defect within 12 months of the work being completed, the defect is presumed to be theirs to fix unless they prove otherwise. The burden of proof flips. Instead of you proving the shower leaks because of their work, they must prove it does not.

Using it takes three things, written notice, within 12 months, describing the defect. Keep proof of the date you sent it. The builder then gets a reasonable time to put things right, and damages remain available if they do not. The practical advice writes itself, walk the job with a critical eye before the anniversary, and put anything doubtful in writing before the window closes.

What if there was no written contract

Since 2015, a written contract has been compulsory for residential building work costing $30,000 or more including GST, along with a prescribed disclosure regime, the builder must give you a standard checklist and information about their skills, insurance and any guarantees before you sign. A builder who does the work without a written contract commits an infringement offence with a fine of up to $2,000 under the Building Act, and knowingly false disclosure can cost an individual up to $50,000 and a company up to $150,000. The $30,000 threshold and the checklist itself are set by the Building (Residential Consumer Rights and Remedies) Regulations 2014.

Here is the part that matters when the handshake deal goes wrong, the missing paperwork is the builder’s offence, not your problem. The implied warranties apply with full force to word-of-mouth jobs, the 12 month presumption still runs, and the Tribunal hears handshake disputes every week. You will argue about what was agreed, which is why the texts and quotes you kept in step one matter, but you have lost none of your legal protections.

The remedies ladder

Work up the rungs, each one is cheaper and faster than the one above it:

1. The conversation and the letter. Free. Most disputes settle here, especially once your letter cites the section 362I warranties and a surveyor’s report is attached.
2. The Disputes Tribunal, now up to $60,000. The jurisdiction doubled from $30,000 on 24 January 2026, which quietly transformed builder disputes, most now fit inside the Tribunal. Fees run from $62 for small claims to $496 for claims between $30,001 and $60,000, no lawyers appear, and hearings happen within weeks. Our Disputes Tribunal guide covers the process.
3. Adjudication under the Construction Contracts Act. The fast lane for bigger or urgent disputes, no monetary cap, covers defect disputes as well as payment rows, and the adjudicator must decide roughly 20 working days after the response comes in. The catch is cost, the parties pay the adjudicator, so with a $60,000 Tribunal available for $496, adjudication now makes sense mainly above that line or when speed is everything.
4. The District Court. For claims over $60,000, with lawyers, formality and months. The 10 year warranty period gives you time, but courts are the rung you climb to only when the numbers justify it.

Licensed building practitioners and complaints

Structural and weathertightness work, called restricted building work, must be carried out or supervised by a licensed building practitioner, who must also give you a record of work. If your builder was negligent or incompetent, worked outside the consent, or was not licensed for restricted work, you can complain to the Building Practitioners Board free of charge. The Board disciplined dozens of builders last year, upholding 81 complaints in its 2024 to 2025 reporting, with outcomes running from censure and training orders to fines of up to $10,000 and losing the licence, and decisions sit on the public register for three years.

Know what the Board is for, accountability, not your money. It cannot order the builder to compensate you, so run the LBP complaint alongside the Tribunal claim, not instead of it. The complaint also creates a public record that protects the next homeowner, which is reason enough on its own.

Liquidated builders, guarantees and leaky homes

The company is in liquidation. The building company folding does not automatically fold your claim. New Zealand courts have held that the person who actually carried out or controlled the defective work owes you a duty of care personally and can be sued even after the company dies, the leading example being Dicks v Hobson Swan Construction, where the builder behind a liquidated company was personally liable. What does not work is suing someone merely for having been a director, liability follows the hands that did or directed the work.

Building guarantees. Master Build Guarantees and Certified Builders’ Halo cover are worth real money in an insolvency, non-completion cover, deposit protection and defect cover, Halo runs two years on workmanship and materials and ten on structure and transfers to later owners. But neither is automatic, they are arranged when the contract is signed, only through member builders, and only exist if the paperwork was actually lodged, so demand written confirmation the guarantee was issued before the build starts.

Leaky homes. The Weathertight Homes Resolution Service is closed, the deadline for new claims passed on 31 December 2021, and the separate financial assistance package had already closed to new applicants in 2016. A leaky-home owner today uses the ordinary route in this guide, the implied warranties and negligence claims, inside the 10 year long-stop, which makes moving quickly on suspicion of leaks more important than ever, per MBIE’s guidance.

Common questions

How long is a builder liable for their work in NZ

Ten years. The Building Act’s implied warranties can be enforced for 10 years from the work, by you or by someone who buys the house after you, and no contract can shorten that.

What if there was no written contract with the builder

Your protections are unchanged, the warranties and the 12 month presumption apply to handshake deals in full. The missing contract is the builder’s offence, punishable by a fine, not a gap in your rights.

Can I withhold the final payment

You can dispute payment for defective work, but do it properly. If the builder sends a formal payment claim under the Construction Contracts Act, you must respond in time with a payment schedule saying what you will pay and why the rest is disputed. Ignore the paperwork and the full amount can become an enforceable debt regardless of the defects.

What if the builder’s company has gone bust

Check three doors. The person who did or controlled the work may be personally liable. A Master Build or Halo guarantee, if one was lodged, covers exactly this situation. And an LBP complaint still holds the individual accountable professionally.

Do I have to let the builder come back and fix it

Generally yes, once. The builder is entitled to written notice and a reasonable opportunity to remedy before you claim the cost of having someone else do it. If their fix fails, or they miss the deadline you set, your remedies open up fully.

Who pays for the building report

You do initially, and it is usually money well spent. If the dispute proceeds, the report’s cost can be claimed as part of your losses, and its existence often ends the argument before any tribunal sees it.

Where to get free help

For the wider toolkit, our guides to the Consumer Guarantees Act and the Disputes Tribunal cover the general consumer machinery this guide plugs into, and if a builder sets a debt collector on you over a disputed bill, our debt collector guide has that covered.

Have you fought a builder dispute, at the Tribunal or over the fence? What worked and what would you do differently? Share your experience in the comments.