New national rules for building granny flats came into effect on 15 January 2026.

These rules allow some small, detached homes up to 70m² to be built without a building consent when all exemption conditions are met.

The exemptions apply only to new, detached, singlestory dwellings (sometimes called Granny Flats).

To qualify, the design must fully meet the New Zealand Building Code, use lightweight construction materials and be carried out or supervised by Licensed Building Practitioners.

“These changes give homeowners new options,” says Chief Executive Nedine ThatcherSwann.

“But they also come with strict rules. Not every small dwelling will qualify. We urge people to talk to us early, check the standards and make informed decisions.”

Council also reminds residents that building consent exemptions and resource consent requirements are separate processes. Being exempt from one does not automatically mean exemption from the other.

Development contributions may still apply to eligible properties when a granny flat is added, depending on the location and services available.

Homeowners considering a granny flat are encouraged to read the information on our website before planning any work.

https://www.gdc.govt.nz/property/building-consent/granny-flats-exemption

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