Quick Answer
In Auckland you can build one detached granny flat of up to 70m² on most residential, rural and mixed use sections without resource consent under the 2026 national standard. The Auckland Unitary Plan separately permits up to three dwellings per site in the Mixed Housing Suburban and Mixed Housing Urban zones, and subdivision is possible down to 400m² lots in Mixed Housing Suburban and 300m² in Mixed Housing Urban. Overlays such as volcanic viewshafts, heritage areas and flood plains can change the answer on any specific site, so screen the actual address.
A 70m² Granny Flat — the 2026 National Standard
From 15 January 2026 the national standard for detached minor residential units (SL 2025/315) applies in Auckland as everywhere in New Zealand: one detached unit of up to 70m² is a permitted activity on sites in residential, rural, mixed use and Māori purpose zones that already have a main house — no resource consent needed if the standards are met. A companion Building Act exemption removes building consent for a compliant single-storey unit.
The standards that matter: at least 2m from boundaries and from the main house in residential zones (10m front and 5m side and rear in rural zones), total building coverage at or under 50% of the site, and one minor unit per site. District plan hazard overlays and title covenants still apply.
Read the full granny flat rules guideTwo or Three Homes on One Section
Auckland remains the most enabled big city in the country for adding homes. Under the operative Unitary Plan (following the partial withdrawal of Plan Change 78 in October 2025), up to three dwellings per site are a permitted activity in the Mixed Housing Suburban (rule H4.4.1) and Mixed Housing Urban (H5.4.1) zones, subject to each zone's built-form standards.
In the Terrace Housing and Apartment Buildings zone the numbers get bigger but the pathway runs through a consent with design assessment, and in the Single House zone a second full dwelling generally is not permitted. Where you sit on that map is the single biggest fact about your property's development potential.
Subdividing an Auckland Section
The Unitary Plan sets vacant-lot minimum net site areas of 600m² in Single House, 400m² in Mixed Housing Suburban, 300m² in Mixed Housing Urban and 1,200m² in THAB (rule E38.8.2.1). A 900m² Mixed Housing Suburban section can therefore support a two-lot split on the numbers alone, but access, servicing and overlay rules decide the real answer.
What the Zoning Map Won’t Tell You
Our Auckland screening checks the parcel against the complete Unitary Plan overlay inventory, 31 overlay layers plus designations: volcanic viewshafts, heritage, notable trees, flood plains and flood-prone areas, coastal inundation and liquefaction among them. A named overlay hit is exactly the kind of thing that turns "looks fine on the zoning map" into a pre-purchase surprise.
Screen Your Auckland Address, Free
Everything above is the general picture. Your section's answer depends on its exact zone, parcel geometry, existing buildings, slope, tenure and overlays — which is what our feasibility screening computes live from LINZ parcel data and Auckland Council's own planning layers, with every rule cited to its source. Screening is free and unlimited across granny flats, multiple dwellings and subdivision.
Screen an Auckland section freeAuckland Development — Common Questions
See what your Auckland section could take
Free screening against the actual rules — your zone, your setbacks, your hazard overlays — computed for your address in under a minute, with every rule cited.