Updated granny flat rules increase choice

The granny flat building consent exemption is expanding to support faster construction, more choice for homeowners, and a wider range of off-site building methods.

Changes to PIM requirements for off-site construction will be included in the upcoming Building Amendment Bill, which is expected to be introduced in the middle of 2026.

Notes:

• Under the National Environmental Standards for Detached Minor Residential Units (NES-DRMU), under the Resource Management Act 1991, homeowners can add a detached minor residential unit of up to 70 square metres without needing a resource consent, provided certain requirements are met such as floor area, building coverage, and setback distances. 

• The NES-DMRU complements the building consent exemption under the Building Act 2004, which remove the need for a building consent for these units if they meet specified criteria.

• Changes to PIM requirements for off-site construction will be included in the upcoming Building Amendment Bill, which is expected to be introduced in the middle of 2026.

• A PIM will continue to apply to granny flats before any onsite building work takes place. Homeowners can also choose to receive a PIM before any offsite building work takes place.

• PIMs are required to convey site‑specific information relevant to design and construction. This includes information on natural hazards and existing public utilities.