Can I be my own builder in NZ?
Short answer
Yes — Section 90B of the Building Act allows an owner to do Restricted Building Work on their own home, with a written exemption from the council. You apply for the exemption before starting work; the council assesses whether you have the necessary skills, or whether you'll engage an LBP supervisor. The exemption applies to one dwelling. Banks, insurers, and warranty schemes may treat owner-builder homes differently — confirm with each before committing.
Source: Building Act 2004 section 90B. Updated May 2026.
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Check a builderKey facts
- Section 90B of the Building Act gives owners the right to apply for exemption
- Apply BEFORE starting work
- One-dwelling rule — you can't owner-build multiple rentals under the same exemption
- Council can require LBP supervision
- Master Build, Halo and Stamford warranties usually don't cover owner-builds
- Most banks restrict construction loans for owner-builders
Who it suits
Owner-builders who have genuine construction background and a clear plan. The exemption isn't a free pass — you still meet the Building Code in full, still need consents (or supervision under the 70 m² exemption), and you carry the legal responsibility for compliance.
Most owner-builders end up engaging an LBP supervisor anyway. The fee saved isn't worth the legal exposure if something goes wrong.
Watch points
Banks: most construction loans require a fixed-price contract with a registered builder. Owner-builders usually can't get construction loans on standard terms — you'll need cash or specialist lending.
Insurance: builder's risk and public liability for owner-builder work is harder to find and more expensive. Confirm coverage before starting.
Warranty: Master Build / Halo / Stamford / Builtin generally don't cover owner-builds. You're carrying the risk if you discover defects later — no insurer to claim against.
Knowing the rules is half the job. The other half is knowing who you're hiring. Check any NZ builder against the public record: company status, licensing and insolvency notices, from the official NZ sources.
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Related questions
Sources: Building Act 2004 section 90B; MBIE Building Performance — owner-builder guidance. 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.