I’ve been reading about the new rules around granny flats under 70m2 and I’m a bit confused.
Does this mean I can build one on my property without building consent?
I’m planning something small in my backyard and want to know:
- Do I still need plans or structural drawings?
- Does it depend on the council or zoning?
- What happens if I build it and it doesn’t meet the rules?
Just trying to understand what’s actually allowed before I start.
Short answer: Not exactly — “consent exempt” doesn’t mean “build whatever you want.”
This is probably the most misunderstood rule in NZ right now.
What’s actually happening
The government (via MBIE) has proposed changes to make it easier to build small standalone dwellings (often referred to as granny flats up to 70m²).
But here’s the key point:
👉 Even if building consent is not required, the building must still comply with the NZ Building Code
What most people miss
We see this a lot:
“No consent = no rules”
Unfortunately… that’s where people get into trouble.
Even for a consent-exempt granny flat, you still need:
- Proper structural design (wind + seismic loads)
- Moisture and durability compliance
- Fire separation (depending on location)
Real-world risk
We’ve seen cases where:
- Owners built a “consent-free” granny flat
- Then failed a property sale or inspection
- Ended up needing a Certificate of Acceptance (CoA)
👉 Which is slower, more expensive, and not guaranteed
Trusted reference
You can read the official guidance here:
👉 https://www.building.govt.nz/projects-and-consents/planning-a-successful-build/scope-and-design/check-if-you-need-consents/building-work-that-doesnt-need-a-building-consent/granny-flats-exemption-guidance-and-resources
(This is MBIE — the authority behind NZ building rules)
😄 Quick reality check
If building without consent sounds too easy…
it usually is 😅
🎯 When to get help
You should get professional input if:
- Your site has slope or tricky ground
- You’re in a high wind zone
- It’s close to a boundary
- You plan to add plumbing later
⚠️ General information only — always confirm with your local council or a qualified professional.