The short answer
New homes, additions and structural alterations generally need a building consent. Some lower-risk work can be exempt under the Building Act, but the exact conditions matter. Your local building consent authority, usually your council, is the right place to confirm a marginal or project-specific case.
All building work must comply with the New Zealand Building Code, even when it does not need a building consent.
An exemption changes the consent requirement. It does not remove the owner's responsibility for compliant work.
Work that commonly needs consent
MBIE's current homeowner guidance says consent is commonly required for work including:
- new buildings, additions and structural alterations
- some demolition, re-piling and earthworks
- plumbing or drainage that creates an additional sanitary fixture
- decks, platforms or bridges more than 1.5 metres above ground
- retaining walls above the relevant exemption limits
- larger sheds, pools and associated pool barriers
This is a starting list, not a project decision. Work that appears similar can fall on different sides of an exemption because of its dimensions, location, structural effect or who carries it out.
What exempt work still requires
Schedule 1 exemptions cover defined categories of lower-risk work. Some can be carried out by anyone; others require a Licensed Building Practitioner, Chartered Professional Engineer or another authorised professional. In every case, the work must still meet the Building Code and other applicable law.
Before treating work as exempt, check the full conditions, not just the project label. A deck, retaining wall, shed or alteration may be exempt at one scale and need consent at another.
A practical decision path
- Define the work. Record dimensions, location, structural changes, plumbing or drainage changes and the intended use.
- Check the official guidance. Use MBIE's consent checker and exemption guidance for the current conditions.
- Check other approvals. Resource consent, district-plan rules or other permits can still apply even if building consent is not required.
- Confirm anything marginal. Ask the council or an appropriately qualified professional before physical work begins.
- Keep the evidence. Retain plans, product information, professional advice, invoices and records of the completed work.
Building consent is not the end of the process
If consent is required, the approved plans and specifications become the basis for the work and inspections. Changes during construction may need to be recorded as a minor variation or handled through a formal amendment. At completion, the owner applies for a code compliance certificate so the council can assess whether the consented work was completed in accordance with the consent.
Where Bracen fits
Bracen can help you frame the project, understand likely cost implications and prepare better questions. It cannot decide whether a particular design is exempt, issue a consent or replace advice from your council, designer, engineer or other qualified professional.
Start planning your project, explore the building cost guides or use the online estimate when an indicative planning range would help.