What is the defects period after a build in NZ?
Short answer
Section 362O of the Building Act gives the homeowner a 12-month implied warranty period on residential building work — the builder has to remedy defects you notify them about during this window, at no extra cost. On top of that, the Building Act allows a claim against the builder for substantive failures within 10 years. Master Build Guarantee and NZCB Halo extend cover further on top of that.
Key facts
- 12 months: implied statutory defects period under the Building Act 2004
- 10 years: long-stop for claims related to building work (s.393 of the Building Act)
- Master Build / Halo: 10 years structural, 2 years general defects (typical)
- Defects have to be notified in writing during the relevant window
- Failing to notify within the window can lose you the right to claim
The 12-month rule
Section 362O treats residential building contracts as including an implied warranty that the builder will remedy any defect notified within 12 months of completion. Completion usually means the date the work was substantially finished (often the CCC issue date, but not always — read your contract).
What counts as 'completion' can be argued. If the builder walked off the job, completion is when the new builder finished. If the contract is silent, the date of the final invoice is a reasonable starting point.
The 10-year long-stop
Section 393 of the Building Act sets a 10-year long-stop for civil claims relating to building work. After ten years from the act or omission, the claim is statute-barred — even if you only discovered the problem later.
Leaky-home era claims are still being brought against original builders within the 10-year window. The clock matters.
How to notify properly
Email the builder a dated list of defects with photos. Keep a copy. If the builder ignores you, follow up in writing 14 days later. Then escalate — Disputes Tribunal, BDT, or your warranty claim.
Don't fix defects yourself before giving the builder a fair chance to remedy. That can void your right to claim the cost back.
Knowing the rules is half the job. The other half is knowing who you're hiring — check any NZ builder's court action, insolvency history, director track record and AI risk score in minutes.
Related questions
Sources: Building Act 2004, sections 362O and 393; Building Performance — building.govt.nz. General information for NZ homeowners, not legal advice — building rules change and vary by council, so confirm critical details on the official source before acting. Last updated 2026-05.