Do I Need a Building Consent for My Project?
If you’re thinking about doing some work on your home — whether it’s a full renovation, building a sleepout, or putting in a new deck — one of the first questions you should ask is:
“Do I need a building consent?”
The short answer? It depends. But getting it wrong can cost you big — in delays, fines, and even problems selling your home later.
What is a Building Consent, Anyway?
A building consent is formal approval from your local council to carry out certain types of building work. It shows that your project plans meet the rules of the New Zealand Building Code, and that the work will be done safely and legally.
Without it, your project could be stopped, fined, or forced to be removed — and you might struggle to get insurance or resale sign-off.
When You Do Need a Building Consent
You’ll generally need consent if your work involves:
- Changing or affecting the structure of the building (e.g., removing a load-bearing wall)
- Doing anything that affects weathertightness (like recladding)
- Adding or altering plumbing or drainage
- Constructing something major, like a new home, extension, or garage
- Building a deck over 1.5m high
- Installing a solid fuel heater (e.g., wood burner)
- Doing any restricted building work (RBW)
When You Might Not Need One
Some smaller or low-risk projects are exempt from needing a building consent. These might include:
- Building a deck under 1.5 metres high
- Small garden sheds (depending on size and location)
- Low retaining walls under 1.5m that don’t support a structure
- Certain types of fencing
- Minor internal work that doesn’t affect the structure (e.g., replacing gib)
But — and this is important — exempt doesn’t mean unregulated. The work still has to meet the Building Code, and in some cases, you still need to tell your council before you start.
What About Granny Flats or Sleepouts?
Currently, small standalone dwellings (often called granny flats) still require a building consent — even if they’re under 70m². However, the Government has proposed changes that may allow some of these builds to be exempt from 2026. Until then, assume you still need consent.
How to Find Out for Sure
The safest way to check is to:
- Talk to your local council building team
- Use the MBIE online building consent decision tool
- Chat with a Licensed Building Practitioner (LBP) or designer
They can confirm whether you need consent and help guide the process if you do.
What Happens if You Skip It?
Skipping consent can lead to:
- A “Notice to Fix” from council
- Being forced to remove or redo unapproved work
- Delays in getting insurance or finance
- Trouble when selling your home (you may need a Certificate of Acceptance)
- Fines up to $50,000
Don’t Guess — Ask First
