Legislation current as at 25 April 2026. Check legislation.govt.nz for any amendments.

Owner-Builder Exemption in New Zealand: Your Legal Guide (2026)

If you’re a homeowner in New Zealand planning to build, renovate, or add to your property, you may have heard about the owner-builder exemption under the Building Act 2004, section 42A. This exemption allows you to carry out or supervise restricted building work (RBW) on your own home without needing a Licensed Building Practitioner (LBP) for every task. But it comes with strict conditions, significant legal responsibilities, and potential pitfalls for your mortgage and insurance.

This guide is current as of April 2026 and explains exactly what you can and cannot do, the risks involved, and how to stay compliant.

What is the Owner-Builder Exemption?

The exemption is found in section 42A of the Building Act 2004 and Regulation 9 of the Building (Licensing of Building Practitioners) Regulations 2006. It allows an individual who owns (or intends to own) a household unit to carry out restricted building work on that unit without holding a relevant license. The key principle is that you must be the owner-occupier — not a developer or investor.

Key Rule: The exemption only applies to work on a household unit that you own and will live in. It does not apply to rental properties, holiday homes you don’t occupy, or commercial buildings. You must also obtain a building consent for any work that requires it.

What is Restricted Building Work (RBW)?

Restricted building work is work that is critical to the integrity of a building, such as:

Structural work (foundations, framing, bracing)
Weathertightness (cladding, roofing, windows)
Fire safety systems (in multi-unit dwellings)

Normally, only an LBP can carry out or supervise RBW. The owner-builder exemption lets you do this yourself, but you must still comply with the Building Code and all consent conditions.

Conditions You Must Meet

To use the exemption legally, you must:

Own the property — or have a legal interest (e.g., a family trust where you are a beneficiary).
Intend to live in the home for at least two years after the work is completed.
Obtain a building consent before starting any RBW.
Notify your council on the consent application that you are using the owner-builder exemption.
Complete a statutory declaration (form available from your council) confirming you meet the criteria.
Carry out the work personally or supervise it directly — you cannot subcontract the RBW to an unlicensed person.

Key Rule: You cannot sell the property within two years of completion unless you can prove the sale was unavoidable (e.g., job relocation, family emergency). If you sell earlier, you may be liable for any defects and could face legal action from the new owner.

What You CAN Do

Dig foundations, pour concrete, and install reinforcing steel.
Erect structural framing and install bracing.
Install cladding, roofing, and windows.
Carry out internal structural work (e.g., removing load-bearing walls with consent).
Supervise other trades (e.g., electricians, plumbers) who must still be licensed under their own regulations.

What You CANNOT Do

Carry out RBW on a property you do not intend to occupy.
Use the exemption for commercial or multi-unit developments (unless you live in one unit).
Hire unlicensed workers to do RBW on your behalf — you must do it yourself or supervise licensed trades.
Ignore the building consent process — all work must be inspected and signed off by the council.

Mortgage and Insurance Risks

This is where many owner-builders get caught out. Banks and insurers view owner-builder projects as higher risk because there is no LBP guarantee of workmanship.

Mortgage Risks:

Many lenders will not lend on a property where the owner is acting as builder, or they may require a higher deposit (often 30-40%).
If you already have a mortgage, check with your bank — some loan agreements prohibit owner-builder work without prior approval.
If you sell within two years, the new buyer’s bank may require a Code Compliance Certificate (CCC) and possibly a retrospective LBP sign-off, which can be expensive.

Insurance Risks:

Standard home insurance policies often exclude cover for defects arising from owner-builder work.
You may need owner-builder insurance (e.g., from NZI or AA Insurance) which covers liability for defects and public liability during construction.
If you cannot get a CCC, your insurer may refuse to cover the property at all.

Key Rule: Always inform your insurer and mortgage provider in writing before starting any owner-builder work. Failure to do so could void your policy or breach your loan agreement.

Step-by-Step Compliance Checklist

Confirm you meet the ownership and occupancy criteria.
Engage a designer or engineer to prepare plans and specifications that comply with the Building Code.
Apply for building consent from your local council, clearly stating you are using the owner-builder exemption.
Complete the statutory declaration and submit it with your application.
Arrange owner-builder insurance and notify your mortgage lender.
Carry out the work in accordance with the consent — do not deviate without council approval.
Book council inspections at each required stage (foundations, framing, pre-line, final).
Obtain a Code Compliance Certificate (CCC) upon completion.
Live in the home for at least two years (or document any unavoidable sale).

Penalties for Non-Compliance

If you breach the exemption conditions, you can face:

Fines of up to $200,000 for individuals under the Building Act.
An order to rectify defective work at your own cost.
Inability to obtain a CCC, which can make the property unsellable and uninsurable.
Legal action from future buyers if defects are discovered.

Frequently Asked Questions

Can I use the exemption for a renovation?
Yes, as long as the work involves restricted building work and you will occupy the home after completion.

Do I need an LBP for non-structural work?
No — only restricted building work requires an LBP. Non-structural work (e.g., painting, tiling) can be done by anyone.

What if I sell before two years?
You must disclose the owner-builder status to the buyer. They may require a retrospective LBP inspection or a warranty of fitness. You could also be liable for defects.

Can I use the exemption for a sleepout or granny flat?
Yes, if it is a separate household unit and you intend to occupy it (or the main house) for two years.

Does the exemption apply to earthquake-prone building work?
Yes, but you must still comply with the Building Code and any specific council requirements for seismic work.

Ready to start your owner-builder project?
Use our online compliance portal to check your eligibility, download the statutory declaration form, and find approved inspectors in your region.

Frequently asked questions

Can I use the owner-builder exemption for a renovation?

Yes, as long as the work involves restricted building work (e.g., structural changes, weathertightness) and you will occupy the home after completion. You must still obtain a building consent and comply with all conditions.

Do I need a Licensed Building Practitioner (LBP) for non-structural work?

No — only restricted building work requires an LBP. Non-structural work such as painting, tiling, or installing non-load-bearing walls can be done by anyone without a license.

What happens if I sell my home before the two-year occupancy period ends?

You must disclose the owner-builder status to the buyer. They may require a retrospective LBP inspection or a warranty of fitness. You could also be held liable for any defects discovered later. Exceptions exist for unavoidable sales (e.g., job relocation, family emergency).

Can I use the exemption for a sleepout or granny flat?

Yes, if it is a separate household unit and you intend to occupy it (or the main house) for at least two years after completion. The same rules apply regarding building consent and inspections.

Does the exemption apply to earthquake-prone building work?

Yes, but you must still comply with the Building Code and any specific council requirements for seismic work. The exemption does not reduce your obligation to meet structural safety standards.