Building Act 2004

What it is

The Building Act 2004 is the New Zealand statute governing building work — how buildings must be designed and constructed, when consents are required, who may carry out restricted work, and the consequences of non-compliance. It is administered by the Ministry of Business, Innovation and Employment (MBIE) through its Building Performance group. Local councils are the building consent authorities (BCAs) responsible for issuing building consents and code compliance certificates.

For vendors and purchasers of residential property, the Building Act matters in several ways: works you or previous owners have done must have been consented if required; restricted building work must have been carried out or supervised by a Licensed Building Practitioner (LBP); and unconsented work can affect the sale, insurance, and any future building consent application.

What it covers

• The Building Code — performance-based standards for building work, covering structure, fire safety, durability, services, moisture, accessibility, and more.
• Building consents — the process for obtaining permission from a BCA before carrying out most building work.
• Code Compliance Certificates (CCC) — issued when consented work is inspected and found compliant with the consent and the Code.
• Exempt building work — certain minor work is exempt from requiring a consent (Schedule 1 of the Act).
• Restricted building work — work that affects structural integrity or weathertightness and must be carried out or supervised by an LBP.
• The Licensed Building Practitioner (LBP) scheme — the licensing regime for building practitioners.
• Certificates of Acceptance (CoA) — an alternative mechanism for work that was carried out without consent.
• Enforcement — notices to fix, infringement offences, and prosecution for breach.

What it gives you

For vendors:

• A clear record of consented work. Building consent documents and CCCs are held by the council and can be obtained via a LIM or a property file request.
• A mechanism (the Certificate of Acceptance) for retrospectively legitimising unconsented work in appropriate cases.

For purchasers:

• Rights to rely on council-held records of consent status.
• The Code Compliance Certificate as evidence of compliance.
• Access to the LBP public register to verify that restricted work was carried out or supervised by a credentialled practitioner.

For inspectors and other property-service professionals working under the LBP scheme:

• A regulatory framework — mandatory Code of Ethics (in force from 25 October 2022), continuing professional development requirements, and a public register.
• A complaints process for consumers through MBIE's Building Practitioners Board.

Key sections and how they work

Part 2 — The Building Code

Sections 17 and 18 establish the general obligation that all building work must comply with the Building Code. The Code itself is set out in secondary legislation — the Building Regulations 1992 (Schedule 1). Compliance is assessed when a consent is processed and when the work is inspected for a CCC.

Section 40 — Buildings must not be constructed etc without consent

"A person must not carry out any building work except in accordance with a building consent."

Our reading: This is the core prohibition. Most material alterations, additions, and new builds require a consent. Exceptions are listed in Schedule 1 (exempt work). Carrying out consent-required work without a consent is an offence.

Section 84 — Restricted building work must be carried out or supervised by licensed building practitioner

Restricted building work is defined work that affects the primary structure, external moisture management envelope, or fire-safety design of a residential building. The practical effect: many building works on a residential property must have been carried out or supervised by an LBP. Work done by someone who is not licensed, and not supervised by someone who is, breaches section 84 even if a consent existed. Breaches are prosecutable offences under the Act; the practical consequences usually bite earlier than prosecution — insurers, councils, and future purchasers treat unconsented or un-supervised restricted work as a material concern that can affect the sale, the ability to obtain a Code Compliance Certificate, and insurance cover.

Section 92 — Code compliance certificates

On completion of consented work, the BCA (usually the local council) inspects the work and, if satisfied, issues a Code Compliance Certificate. The CCC is the document that confirms the work was done in accordance with the consent and the Code. Sales where the CCC is missing for significant work are worth investigating before settlement.

Section 96 — Certificates of acceptance

Where building work was carried out without the required consent, the owner can apply for a Certificate of Acceptance. The CoA is a retrospective assessment that the work meets the Code. It is a more limited document than a CCC (it does not confirm full compliance with the consent process) but can legitimise non-consented work sufficiently for insurance, future consents, and purchaser peace of mind.

Section 314A and Code of Ethics

Section 314A empowers the Governor-General to prescribe a Code of Ethics for Licensed Building Practitioners. The Building (Code of Ethics for Licensed Building Practitioners) Order 2021 was made under this section and came into force on 25 October 2022. The Code sets four principles of ethical conduct:

• Working safely — implemented by Part 2 of the Order.
• Acting within the law — Part 3.
• Taking responsibility — Part 4.
• Behaving professionally — Part 5.

Breaches of the Code can lead to disciplinary action by the Building Practitioners Board, including fines, suspension, or cancellation of licence.

How the Act is applied in practice

For a typical residential sale, the Building Act touches the transaction in the following ways:

• LIM report: the council's Land Information Memorandum lists consents issued and CCCs issued. Gaps between consented work and CCCs issued are investigation flags.
• Property file: a full council property file (requested directly from the council) contains the underlying documents — consent applications, plans, inspection records, CCCs.
• Vendor warranties (under the ADLS Sale and Purchase Agreement): the standard ADLS warranties include that works done by the vendor were carried out with all required consents and permits.
• Building inspections: NZS 4306:2005 inspections are typically carried out by LBPs. Their inspection identifies potential non-consented work or defects, which may trigger further investigation.

For vendors, the practical question is: has any work been done that should have been consented, and is the documentation in order? If non-consented work exists, the cleanest path is usually to apply for a Certificate of Acceptance before listing. This is a vendor cost but preserves purchaser confidence and reduces the risk of the issue derailing a sale late in the process.

Common misuses

"It was just a small job, so it didn't need a consent"

Schedule 1 of the Act lists exempt work. Some work that looks small is nonetheless not exempt — decks above a certain height, some plumbing work, changes to structural elements. "Didn't need a consent" is a statutory question, not a judgement call. The cleanest way to confirm is to check Schedule 1 or obtain confirmation from the council before the work is carried out.

"The LBP scheme is voluntary"

LBP licensing is mandatory for restricted building work under section 84. It is not voluntary. Non-LBP practitioners may do non-restricted work and may be supervised by an LBP for restricted work, but restricted work itself cannot be carried out by someone with no LBP credentials and no LBP supervision.

"If we just don't mention the unconsented work, we'll be fine"

Unconsented work can come to light via the LIM (where a council has a record of the work being done without consent), the property file, a building inspection, a purchaser's solicitor's searches, or neighbour complaint. Non-disclosure that turns into misrepresentation can breach the Fair Trading Act section 9, the ADLS standard vendor warranties, and PCCC Rule 10.7. The risk is larger than the cost of a Certificate of Acceptance.

When you might cite this Act

• When the LIM shows consents without corresponding CCCs. Investigate the specific works; consider whether CCCs can be obtained or Certificates of Acceptance applied for.
• When you are engaging a builder for restricted work. Section 84 requires LBP involvement. Verify on the LBP register.
• When you suspect work was done without the required consent. A Certificate of Acceptance (section 96) is usually the right response. Vendor's solicitor coordinates with the council.
• When the ADLS standard warranties are in play — they include warranties that works have the necessary consents. The Building Act is the source of that requirement.

Related rules

• NZS 4306:2005 — building inspection standard; many inspectors are LBPs licensed under the Building Act.
• ADLS Agreement for Sale and Purchase of Real Estate — standard warranties include compliance with Building Act requirements.
• LGOIMA (LIM disclosure) — the LIM process that surfaces council-held building records.
• Professional Conduct and Client Care Rules 2012 — Rule 10.7 on disclosure of known defects.
• Fair Trading Act 1986 — applies to representations about consented status.

Authoritative sources

• Full text: Building Act 2004 — legislation.govt.nz
• MBIE Building Performance: building.govt.nz — consents, Code, exempt work guidance.
• Licensed Building Practitioners: lbp.govt.nz — public register, Code of Ethics, complaints process.
• Code of Ethics for LBPs Order 2021: legislation.govt.nz

Our guides that use this Act

• The building inspection report: what NZS 4306 requires
• Who drafts your disclosure document?