Quick Answer
From 15 January 2026, you can build one detached granny flat of up to 70m² on most residential, rural, mixed use and Māori purpose zoned sections in New Zealand without resource consent, under the national environmental standard for detached minor residential units (SL 2025/315). A companion Building Act exemption removes building consent for a compliant single-storey unit. The section must already have a main house, the unit must sit at least 2m from boundaries and the main house (residential zones), total building coverage must stay at or under 50%, and district plan hazard rules, covenants, and cross-lease or unit title arrangements can still require professional input.
What Changed in January 2026?
New Zealand used to leave granny flats entirely to each district plan — the same unit could be a permitted activity in one city and need full resource consent one street over the council boundary. Two national rule changes replaced that patchwork.
First, the Resource Management (National Environmental Standards for Detached Minor Residential Units) Regulations 2025 (SL 2025/315, in force 15 January 2026) make a compliant granny flat a permitted activity nationwide in eligible zones. If the standards are met, no resource consent is needed and the council cannot require one.
Second, a companion Building Act exemption removes the need for building consent for a compliant single-storey unit — the part of the process that used to add months and thousands of dollars before a spade hit the ground.
The RMA standard (resource consent) and the Building Act exemption (building consent) are separate. The 70m² cap and the setbacks come from the RMA standard. The single-storey, 4m height and 1m floor-level limits come from the Building Act exemption. A unit can pass one and fail the other — a two-storey 65m² unit needs no resource consent in an eligible zone, but it does need building consent.
The Size and Placement Standards
These are the actual standards, drawn from the legislation itself. Meet all of them and the unit is a permitted activity in an eligible zone.
On a typical 450–600m² urban section with an existing house, garage and sleepout, total building coverage is often already near 40–45%. Adding 70m² can push past the 50% limit even though the unit itself complies. This is the single most common reason an otherwise-eligible section fails screening in our data.
Which Zones Qualify?
The standard applies in four zone categories, mapped from each district plan to the national planning framework:
- Residential zones — the main case: single house, mixed housing, medium and high density zones
- Rural zones — with the larger 10m/5m setbacks
- Mixed use zones — using the district plan’s own setbacks and coverage
- Māori purpose zones — using the district plan’s own setbacks and coverage
It does not apply in:
- Business, commercial, industrial, town centre and city centre zones
- Open space, conservation and special purpose zones
Where a district plan is proposed, under appeal, or mid plan-change, the zone’s status matters — a site whose zoning is not yet operative deserves a planner’s eyes before you rely on the standard. Our screening checks the plan’s version status for exactly this reason.
What Can Still Stop You
The headline rule is generous, but regulation 7 of the standard preserves the district plan’s rules on hazards and a handful of other matters. In practice these are what catch real sections:
- Natural hazard overlays. Flood plains, coastal inundation, liquefaction and slope-instability layers still apply. In Christchurch and Tauranga, liquefaction management zones cover much of the city — an honest screening there often says “get a geotech report”, because that is genuinely the right answer.
- Heritage, character and special overlays. Viewshafts, heritage areas, notable trees and character precincts carry their own rules that the standard does not override.
- Title covenants. A registered covenant — a no-further-building or single-dwelling covenant is common in newer subdivisions — can prevent the build regardless of zoning. Covenants sit on the title, not in the district plan, so zoning maps will not warn you.
- Cross-lease and unit titles. The standard is written for the straightforward fee simple case. On a cross-lease you generally need the other lessees’ consent and possibly a flats plan update; on a unit title, body corporate rules apply.
- Steep sites. A sloping section brings earthworks and foundation questions the exemption does not cover. We flag anything over 15° for geotechnical review.
- Services and infrastructure. Wastewater and stormwater capacity, and the cost of new connections, are practical constraints the planning rules leave to you and your council.
Even when no consent is needed, councils can charge development contributions on a new dwelling unit under the Local Government Act. Depending on the council this can run to five figures. Check the council’s development contributions policy before you budget the project.
Check Your Own Address, Free
Reading the rules tells you what’s possible in general. Whether your section qualifies depends on its zone, its exact parcel geometry, what’s already built on it, its slope, its tenure, and every overlay that touches it. That is precisely what our feasibility screening computes — live against LINZ parcel data and each council’s own planning layers, with every rule cited to its source.
Screening is free and unlimited, and covers granny flats, adding multiple dwellings, and subdivision. It currently runs in nine councils:
Unitary Plan + 31 overlays Christchurch
District Plan + hazard layers Wellington
2024 District Plan Hamilton
Plan Change 12 zones Tauranga
City Plan + BOPRC hazards Dunedin
2GP zones Napier
District Plan New Plymouth
District Plan Palmerston North
District Plan
Granny Flat Rules — Common Questions
See what your section could take
Free screening against the actual rules — the 70m² standard, your zone, your setbacks, your hazard overlays — computed for your address in under a minute, with every rule cited.