Granny flats in Auckland: the 70m² national rule explained
Updated 10 November 2026 · Auckland Unitary Plan
Since 15 January 2026, the National Environmental Standards for Detached Minor Residential Units let you build one small detached home on a site with a main house, without resource consent, if it meets the standards.
The headline rule
One detached minor unit per site, with a floor area of up to 70m². It has to meet the national standards, for example on its position, size and the site's coverage limits.
It's a separate small home: you can't use the rule for more than one unit on the same site.
What still applies
Building consent is still usually required. Overlays such as heritage or flood areas, and services like stormwater and wastewater connections, can add requirements. Check with the council or a planner for your site.
See it for your own site
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Check an address →Common questions
How big can a granny flat be in Auckland?+
Under the national rules, up to 70m² of floor area for one detached minor unit, if it meets the standards.
Can I rent out a granny flat?+
The rules are about building it. Renting it out has its own obligations, such as the Healthy Homes standards; check them separately.
More guides
- Auckland residential zones explained
- How many houses can I build?
- Height in relation to boundary explained
- Cross leases explained
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General information only — not planning, legal or valuation advice. Rules change; check the Auckland Unitary Plan or ask a planner for your site.