Rules
Granny Flat Rules in New Zealand
Granny-flat projects sit across national building rules, national planning standards and property-specific council information. Keeping those layers separate makes the process far easier to understand.
Regulatory information reviewed: 4 September 2026
Planning rules — national standards plus local information
Since 15 January 2026, the National Environmental Standards for Detached Minor Residential Units (NES-DMRU) provide a nationwide permitted-activity pathway for qualifying detached minor residential units of up to 70m² when the specified standards are met. You still need to check your council's current plan information, overlays, hazards and any rules or matters that remain relevant to the property.
Common property-level checks include:
- Site coverage — how much of the section may be built on
- Setbacks and height in relation to boundary
- Outdoor living space for each dwelling
- Minimum net site area or density provisions
- Parking and access requirements
- Overlays for hazards, character, heritage or infrastructure
If a proposal does not qualify as permitted under the applicable planning framework, resource consent may be required. That does not necessarily make the project impossible; it changes the approval pathway and should be identified before detailed design is committed to.
Building rules — set nationally
The Building Code applies whether or not a building consent is required. Since 15 January 2026, eligible new standalone, single-storey, self-contained dwellings up to 70m² can use the granny-flat building-consent exemption if every condition is met. A PIM is still required before work begins, and licensed professionals must carry out or supervise the relevant work. See our 70m² guide.
Servicing and infrastructure
Councils confirm whether the network can accept an additional connection, and development contributions may apply. Unserviced properties need designed water supply and on-site wastewater treatment and disposal.
If you intend to rent it out
The dwelling must be lawfully established for residential use, and standard tenancy obligations apply — including healthy homes standards for heating, insulation, ventilation, moisture and draught stopping. Build these in rather than retrofitting later.
The practical sequence
- Check the property and identify the responsible council
- Check the NES-DMRU standards and the council information that applies to the site
- Test the concept against usable site area and access
- Resolve servicing early
- Confirm the consenting pathway before committing to a design
Start with a property check or read can I build a granny flat.
Property and planning information is preliminary only. Eligibility depends on current planning rules, site conditions, servicing, design and professional assessment.
Common questions
- Is a granny flat the same as a minor dwelling?
- In everyday use they mean the same thing: a smaller, self-contained dwelling on the same site as an existing house. District plans use their own defined terms, which is what governs the rules for your property.
- Can a granny flat be rented out?
- A compliant, self-contained dwelling can generally be tenanted, but the dwelling must be lawfully established for residential use and meet residential tenancy obligations, including healthy homes requirements.
- Does a granny flat need its own parking?
- Parking requirements vary between district plans and zones. Some require none, others do. It should be confirmed for your property.
- Can a granny flat be subdivided off later?
- Not automatically. Subdivision is a separate process with its own rules and is often not possible. Do not assume it as part of the project's value.
Start with your address
A property check takes less than a minute and gives a specialist something useful to work with.