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Minor dwellings in Auckland (2026): the planning and building rules

Since 15 January 2026, a national standard lets you add one detached granny flat of up to 70 m² to a site with a principal home, without resource consent, in residential, rural, mixed use and Māori purpose zones, if its standards are met. Here is how it sits with the Auckland Unitary Plan's own minor dwelling rules, what the plan still controls, and what it means for a Yard 37 or a Yard 57.

Granny flat, minor dwelling, DMRU: what is the difference?

Four terms cover overlapping ideas:

• Granny flat is the everyday name.
• Small stand-alone dwelling is the Building Act's term, in the building consent exemption.
• Detached minor residential unit (DMRU) is the national planning standard's term: a self-contained residential unit, ancillary to the principal residential unit and held in common ownership with it on the same site, and completely detached from it.
• Minor dwelling is the Auckland Unitary Plan's term, for a dwelling that is secondary to the principal dwelling on the site.

Two separate sets of rules apply. Planning rules, under the Resource Management Act, decide whether you need a resource consent; building rules, under the Building Act, decide whether you need a building consent. MBIE notes that the planning standard and the building consent exemption can operate independently: a granny flat can meet one and not the other.

The national planning standard: what it allows

The Resource Management (National Environmental Standards for Detached Minor Residential Units) Regulations 2025 came into force on 15 January 2026. One DMRU per site is a permitted activity in residential, rural, mixed use and Māori purpose zones, if it meets these standards and the plan rules that still apply, listed further down:

Since 11 September 2026, the regulations state that these distances are measured to the exterior face of the unit's external wall, as for the building consent exemption. The unit must be ancillary to a principal home on the same site, so the standard does not apply to a vacant section.

Auckland's Unitary Plan uses its own zone names, such as the Single House Zone or the Mixed Housing Suburban Zone, rather than the national ones. The official guidance on the standard says that where a council has not yet implemented the National Planning Standards, the standard applies in the equivalent zones of its plan. Ask Auckland Council to confirm how it applies to your zone.

What Auckland's district plan still controls

Even when the national standard applies, the unit must meet the district plan's rules on:

• subdivision;
• matters of national importance under section 6 of the Resource Management Act, such as outstanding natural features, heritage sites and sites of cultural significance;
• any use other than residential activities;
• papakāinga;
• earthworks;
• the rules for the principal home that manage health and safety: natural hazards (for example minimum floor levels against flooding), reverse sensitivity, which protects existing activities such as networks, industry and farming, and site-specific infrastructure for drinking water, wastewater and stormwater.

Regional plan rules also apply in full, and so do more stringent bylaws and any covenant on your title. If the unit breaches one of these rules, a resource consent is needed for that rule only, and the national standard still applies to the rest.

What the plan can no longer require

For a unit that meets the national standard, no other district plan rule applies. In particular, the plan cannot apply rules on amenity values, such as special character or design guides, or minimum requirements for outdoor living space, privacy, sunlight, glazing or parking. The official guidance adds that the standard also overrides minimum site sizes for adding a unit.

The plan can be more generous than the national standard, for example with a larger floor area. But a unit above 70 m², or closer than 2 m to a boundary or to the house, no longer fits the building consent exemption, and needs a building consent.

The Unitary Plan's own minor dwelling rules

Where the national standard does not apply, for example for an attached unit or a second unit on the site, or if you rely on a more generous plan rule, the Auckland Unitary Plan decides. In the version on the plan's website on 3 November 2026, the zones we read for this guide treat a minor dwelling as follows:

The plan marks those deletions "S 104(1A)": they follow the new section 104(1A) of the Resource Management Act, in force since 30 October 2026, which tells a consent authority to disregard the size of a residential unit and the outdoor living space, among other matters, for residential activities. Our guide to the Single House Zone in Auckland sets out what that zone allows, its standards and its subdivision rules.

Parts of the Single House, Mixed Housing and Terrace Housing and Apartment Buildings zone chapters are marked as modified by Plan Change 120 (Housing Intensification and Resilience), which is still going through its process: submissions on its latest proposed amendments closed on 24 September 2026. Check the current text for your site. We have not read the rules of the other Auckland zones, such as the Future Urban Zone or the business zones, for this guide.

Building consent or exemption: the other half of the rules

Planning is only half of it. Building work needs a building consent unless it fits the granny flat exemption in the Building Act, with its own conditions: new, stand-alone, single storey, 70 m² or less inside the walls, at least 2 m from boundaries and other homes, designed and built by licensed people, and a PIM from the council before any building work. Our guide to the 2026 granny flat rules lists them all.

The PIM tells you about hazards, services and bylaws for your section, and can include information from the district and regional plans. It is information, not an approval: for an exempt granny flat, the council does not issue the certificate it attaches when a resource consent is needed. If you plan more than one granny flat, each needs its own PIM, and a resource consent may also be needed.

Council charges for a minor dwelling

A granny flat can attract development contributions and, where the district plan has a rule for them, financial contributions. Auckland Council assesses granny flats for development contributions, notified with the PIM, and Watercare charges its growth charge for a new residential unit that connects to its networks. Our guide to granny flat costs in Auckland gives the current amounts and what they depend on.

What this means for a Yard 37 or a Yard 57

• Floor area: 35.2 m² inside the walls for the Yard 37 and about 54.3 m² for the Yard 57, under the 70 m² of the national standard and of the building consent exemption. They measure 37.2 m² overall and 56.7 m² overall.
• Detached and single storey: both are stand-alone units, so either can be the one DMRU on a site that qualifies.
• Distances: plan at least 2 m between the expanded unit and the house, and between the unit and each boundary, measured to the outside face of its walls.
• Building coverage: in a residential zone, building coverage for the whole site, house included, must stay at 50% or less under the national standard.
• Access: the unit arrives by truck and is set on its foundations by crane, so check access to the place where it will stand.
• Building rules: two questions about our units have been open with MBIE since 23 October 2026, on homes built overseas and on our bolted steel frame. Until MBIE answers in writing, we take no deposit for a project that relies on the exemption. Our guide to expandable granny flats in New Zealand explains both questions.

Checklist for your section

1. Your zone and any overlays on the Unitary Plan maps, and whether Plan Change 120 changes them.
2. A principal home on the site, and no other detached minor unit already there.
3. Room for the unit with 2 m clearances, and building coverage of 50% or less in a residential zone.
4. Natural hazards, heritage and earthworks: the rules that still apply.
5. Covenants on your title, and any bylaw that applies.
6. Services: water, wastewater and stormwater connections, and the electricity supply.
7. Your PIM, the development contributions and Watercare's growth charge.
8. Truck and crane access.

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