02/06/2025
The New Zealand government is proposing significant changes to simplify the construction of granny flats (also known as minor residential units or MRUs) up to 60 square metres in size. These reforms aim to address housing shortages by reducing regulatory barriers and are expected to come into effect by mid-2025.
MBIE
Key Aspects of the Proposed Changes
Size and Structure: Granny flats up to 60 square metres, limited to one storey, would be permitted. These dwellings must be detached from the main house and owned by the same person or group as the primary dwelling.
Building Consent Exemption: A new schedule in the Building Act 2004 would exempt these structures from requiring a building consent, provided they meet specific criteria and are constructed or supervised by Licensed Building Practitioners.
Resource Consent Exemption: A National Environmental Standard (NES) under the Resource Management Act would allow granny flats in rural and residential zones without the need for resource consent, subject to certain conditions.
Compliance Requirements: Despite the exemptions, all granny flats must still comply with the New Zealand Building Code to ensure safety, health, and durability.
Infrastructure Considerations: Homeowners should be aware of the impact on local infrastructure, such as water and wastewater systems, and may still need to comply with local council regulations regarding setbacks, site coverage, and permeable surface requirements.
Public Consultation and Feedback
The government conducted a public consultation from June to August 2024, receiving nearly 2,000 submissions—the highest number for a building and construction policy review in New Zealand. The majority of respondents supported the proposals, citing benefits such as increased housing supply and reduced construction costs. However, some concerns were raised about potential risks, including environmental impacts and the quality of construction without traditional oversight.