Building consent in New Zealand — a plain-English guide

The building consent process is one of the most confusing parts of any residential project. Here's a clear, practical breakdown of how it works in New Zealand — particularly in Auckland and Northland.

What is building consent?

Building consent is council's approval to proceed with construction. It's required under the Building Act 2004, and it confirms that your proposed work complies with the New Zealand Building Code — the national standard for building performance covering structure, weathertightness, fire safety, plumbing, insulation and more.

Without building consent (where it's required), you're building illegally. This creates serious problems when you come to sell the property or if something goes wrong.

What work needs building consent?

The short answer: almost everything structural. The following always requires consent:

• New homes and major additions
• Structural alterations (removing or moving walls, changes to the roof structure)
• New decks over 1.5m above ground
• New plumbing or drainage connections
• Retaining walls over 1.5m
• Swimming pools and spa pools
• Sleep-outs and minor dwellings

Some minor work is exempt — small sheds under 10m², internal non-structural alterations, like-for-like replacements of fixtures. But when in doubt, check with your council or architect before starting. Councils have different interpretations and the cost of getting it wrong is high.

The consent process — step by step

What is an RFI — and why does it matter?

An RFI (Request for Further Information) is council asking for clarification or additional documentation before they can process your application. Every time council issues an RFI, the 20-working-day clock stops — and only restarts when you respond.

This is the single biggest cause of consent delays. A project with two or three RFIs can take four to six months to consent instead of six to eight weeks.

The best way to minimise RFIs is thorough documentation from the start. An experienced architect who knows what a particular council expects — and prepares a clean, complete set — will almost always get through faster than a poorly documented application.

How long does building consent take in Auckland and Northland?

Realistically, for a new residential build:

• Best case (clean application, no RFIs): 6–8 weeks
• Typical: 10–14 weeks
• Complex or RFI-heavy applications: 4–6 months

Northland councils (Whangārei District, Kaipara) are generally faster to process than Auckland Council, which handles a much larger volume of applications.

Resource consent vs building consent — what's the difference?

Resource consent is about whether your project is permitted under the district plan — it's a planning matter, not a building code matter. You might need resource consent if your project doesn't meet rules around height, boundary setbacks, site coverage, or character overlays. This is a separate process to building consent and is managed by the planning team, not the building team.

Some projects need both. Your architect should identify this early — ideally before you're committed to a design that can't be consented.

Do I need an architect to get building consent?

No — you don't legally need a registered architect. But you do need someone who can prepare a compliant set of documentation. Most councils require that residential consent documentation is prepared by or under the supervision of a Licensed Building Practitioner (LBP) in design.

For complex projects, having a registered architect prepare and manage your consent application typically means a smoother, faster process — and fewer unpleasant surprises during construction.