Granny flats and small homes in Chatham Islands.
The Chatham Islands have one council and are about 800 km east of Christchurch. Family and worker accommodation may be reasons to consider a small home. Wind, salt exposure, ground conditions and transport require careful planning. Seventy supplies architectural plans adapted to your property; you appoint a licensed builder. The builder’s quote and programme need to include shipping, travel, accommodation and the relevant local requirements.
Building consent and resource consent requirements
Both national reforms apply in Chatham Islands. Building consent and resource consent are separate requirements. Your project must meet all the relevant conditions to proceed without either.
Schedule 1A, under the Building Act 2004
Building consent, if all Schedule 1A conditions are met
A new, detached, single-storey home up to 70 m² may be built without a building consent if every exemption condition is met. Licensed professionals, Building Code compliance, a Project Information Memorandum and council notifications are still required.
NES-DMRU, under the Resource Management Act 1991
Resource consent, if all relevant requirements are met
The national planning standard can permit one detached minor dwelling without resource consent when its standards and other relevant requirements are met. Some district and regional rules remain, including those for hazards, infrastructure and earthworks.
Both took effect on 15 January 2026. They do not retrospectively approve existing dwellings.
National planning standards
The NES-DMRU sets these measurements for qualifying detached minor dwellings in Chatham Islands. District plans can allow more generous measurements. Other relevant site restrictions still apply.
| Standard | Residential zone | Rural zone |
|---|---|---|
| Maximum internal floor areaMeasured to the internal face of the external walls. An attached or internally accessed garage counts inside it. | 70 m² | 70 m² |
| Maximum area of the site covered by buildingsThe 50% standard overrides any district plan coverage standard below 50% in a residential zone. | 50% | As required by the zone |
| Minimum distance from the main homeDistances are measured from the outside face of the wall cladding. | 2 m | 2 m |
| Minimum distance from the front boundary | 2 m | 10 m |
| Minimum distance from side and rear boundaries | 2 m | 5 m |
The permitted activity rule: One detached minor residential unit per site. It applies in residential, rural, mixed use and Māori purpose zones, as defined in the National Planning Standards, or the equivalent zones where a council has not implemented them yet.
- Special character, design guides and visual amenity
- Screening for rubbish and recycling storage
- Wall and roof colour, reflectivity and external finishes
- Minimum outdoor open space, privacy or sunlight access
- Minimum window area
- Parking
- Minimum site size
- A design that satisfies a local character guide
- A minimum private outdoor space around the unit
- A sunlight or privacy assessment for the neighbours
- An on-site car park
- A minimum site area under the district plan
- Neighbour notification for a permitted activity
Other requirements to check
Natural hazards, services, title restrictions and other site requirements can affect your project. Confirm which apply to your address.
Flooding, coastal hazards, fault lines and land stability can affect the building location, floor level and need for consent. Check the council information and obtain site advice where needed.
Check connection requirements and capacity. Relevant regional plan rules still apply, including requirements for an on-site wastewater system.
Buildings near electricity lines and other significant infrastructure must meet the relevant safe-distance and planning requirements.
Rules can apply near airports, ports, industry and farming operations, or on contaminated land. They may affect where a home can be built and what design measures are needed.
Earthworks may need resource consent even when the dwelling does not. Subdivision requirements are separate and remain in place.
Relevant protections for heritage, cultural sites and outstanding natural features still apply.
Check covenants and easements on your property title. The national planning standard does not override private covenants, and more stringent council bylaws can still apply.
Development and financial contributions may be payable. Ask your council to confirm which charges apply to your project.
A district plan may allow a larger home or a smaller boundary setback. That does not change the separate Schedule 1A requirements. For example, an 80 m² dwelling or a 1 m setback would not meet the 70 m² and 2 m conditions for this building consent exemption.
Check the main eligibility conditions
Check these conditions with your designer and council. They are a starting point; all relevant exemption requirements must be met.
The minor dwelling must be physically separate from the principal home. An attached extension is assessed under different requirements.
The NES-DMRU planning standard requires a minor dwelling to be secondary to a principal home on the same site and in the same ownership. If both are proposed together, confirm the construction order and requirements with the council.
The NES-DMRU allows one detached minor dwelling per site. For a cross-lease, the site includes all the land under the cross-lease. A district plan may allow more, subject to its requirements.
The building consent exemption applies to new dwellings. A building conversion may meet the planning standard, but it is not covered by this building consent exemption.
Ground conditions and foundations
Peat, limestone and coastal sand require property-specific foundation advice. Wind and salt exposure also affect bracing, fixings, flashings and cladding. The designer should confirm the requirements for the address, and the builder should use that specification when planning materials and transport.
The islands include peat, limestone and coastal sand, with very high or extra high wind exposure in some locations. Confirm the exact exposure and ground conditions at the address. Materials and fixings need to suit salt exposure, and construction timing must allow for freight and weather.
Site restrictions in Chatham Islands
Council maps help identify potential restrictions. Your designer and council can confirm how they affect the building location, floor level or need for additional reports.
Confirm the wind exposure and structural requirements for the specific location.
Check coastal erosion and sea-flooding information before choosing the building position.
Confirm corrosion protection for fixings, flashings and exterior materials exposed to salt air.
Check heritage and cultural-site requirements with the council and relevant authorities.
Local requirements to check
Review these local considerations when planning a project in Chatham Islands.
Agree shipping, storage and delivery arrangements with the builder before construction starts.
Include travel and accommodation for any visiting contractors in the quote and schedule.
Confirm wind and corrosion specifications for the address before materials are ordered.
National exemption conditions apply on the islands. Relevant local hazards, heritage and service requirements must also be checked.
Uses for a small home in Chatham Islands
A small home may provide family accommodation or housing for people working in fishing, farming, tourism and local services. Confirm the intended use and available services. Procurement, transport and contractor accommodation need to be planned in advance because replacement materials may take time to arrive.
No reliable island rental comparison is supplied here. Plan-set prices follow the published catalogue; construction is quoted separately for each project. Ask the builder to include shipping, travel, accommodation, services and site work. A mainland calculator estimate alone is not sufficient to budget for an island build.
Steps to plan your project
Review the title, planning requirements and services before construction. Your designer, builder and council can confirm what the project requires.
Check covenants and easements that could restrict a second home, its size, location or access.
Review council maps and relevant district and regional rules for natural hazards, infrastructure and other restrictions.
Identify the water, wastewater and stormwater connections and confirm capacity. Check any requirements for an on-site wastewater system.
Apply for and receive a Project Information Memorandum before construction starts. It records the council information relevant to the property and proposed work.
Your designer confirms the design requirements for the property and prepares the required plans and documentation. The Schedule 1A exemption requires appropriately licensed professionals.
Notify the council before construction and provide the required completion documents afterwards. Your designer and builder must supply the records and certificates required for their work.
The council in Chatham Islands.
Find your council guide for local natural-hazard information, services, contributions and the Project Information Memorandum process.
Plans anywhere in Chatham Islands.
Plan sets start at $4,900 and include a licence for one build. Seventy supplies the plans; you appoint your own licensed builder to quote for and construct the home.
Frequently asked questions
Does Seventy supply plans on the Chatham Islands?+
Seventy supplies architectural plans for properties on the Chatham Islands, including Waitangi. The plans are adapted to your address and include a licence for one build. You appoint and pay your own licensed builder to quote for and carry out construction.
Will I need consent for a small home on the Chatham Islands?+
A home up to 70 m² may qualify for the building consent exemption if all Schedule 1A conditions are met. Resource consent is a separate question. On the Chatham Islands, check the national planning standards and relevant local requirements, including hazards, services and the property title.
What ground conditions should I check on the Chatham Islands?+
Peat, limestone and coastal sand require property-specific foundation advice. Wind and salt exposure also affect bracing, fixings, flashings and cladding. The designer should confirm the requirements for the address, and the builder should use that specification when planning materials and transport.
Which local requirements need checking on the Chatham Islands?+
Confirm the wind exposure and structural requirements for the specific location. Agree shipping, storage and delivery arrangements with the builder before construction starts. Your designer and council can confirm the requirements for the specific address and proposed use. A general regional guide cannot establish whether an individual property is suitable for the design.
How should I budget for a small home on the Chatham Islands?+
No reliable island rental comparison is supplied here. Plan-set prices follow the published catalogue; construction is quoted separately for each project. Ask the builder to include shipping, travel, accommodation, services and site work. A mainland calculator estimate alone is not sufficient to budget for an island build.
How long could construction take on the Chatham Islands?+
A Chatham Islands construction schedule must be prepared for the individual project. Shipping, material availability, contractor travel, accommodation, weather and site work can affect timing. Ask your licensed builder for a programme that includes those arrangements and any required council processes before construction.
Official guidance
The links below explain the national rules and exemption conditions. Confirm local requirements with your council.
- NES-DMRU: Frequently Asked QuestionsMinistry for Cities, Environment, Regions and Transport, September 2026 (INFO 1387)
- National Environmental Standards for Detached Minor Residential UnitsMinistry for the Environment
- Granny flats exemption guidance and resourcesBuilding Performance, MBIE
- Changes to allow granny flats to be built without a building consentBuilding Performance, MBIE
Checked against these sources in September 2026. Confirm the current requirements for your property before construction.