In most cases, installing a standard residential heat pump in New Zealand does not require a building consent. The work typically falls under a Schedule 1 exemption in the Building Act 2004 — but there are conditions, and the electrical work involved is always restricted to a licensed professional. Here's what every homeowner needs to know.
The Schedule 1 Exemption Explained
New Zealand's Building Act 2004 includes a list of building work that is exempt from requiring a building consent, known as Schedule 1. Installing a heat pump (such as a wall-mounted split system) generally qualifies as exempt work, provided it meets certain criteria:
- The unit is a standard residential heat pump (not a large commercial system)
- The installation does not involve significant structural work (e.g. cutting large holes in load-bearing walls or roof structures)
- The work complies with the NZ Building Code, including relevant clauses such as E2 (External Moisture) if penetrations are made through the building envelope
- The installation follows the manufacturer's specifications
Because exemptions can depend on your specific situation, MBIE Building Performance recommends always confirming with your local council before starting work. Councils can interpret Schedule 1 differently, and some may have additional requirements.
When a Building Consent May Be Required
While most heat pump installs are exempt, there are situations where you will need a building consent:
- Ducted heat pump systems that involve significant work inside ceiling cavities or walls
- Installations requiring structural modifications, such as cutting into a load-bearing wall or altering roof framing
- Commercial or multi-unit residential buildings, where different rules may apply
- Any work that affects weathertightness in a way that goes beyond a simple pipe penetration
- Some ground-source (geothermal) heat pump installations, which can involve significant earthworks
If you're unsure, your heat pump installer or a Licensed Building Practitioner can advise you before work begins.
The Electrical Work Is Always Restricted
Regardless of whether a building consent is needed, the electrical connection of a heat pump is restricted electrical work under the Electricity Act 1992. This means it must be carried out by a registered electrician — it is illegal for a homeowner to do this themselves.
Your installer must:
- Be registered with the Electrical Workers Registration Board (EWRB)
- Issue you a Certificate of Compliance (CoC) for the electrical work once complete
- Ensure the installation meets the requirements of AS/NZS 3000 (the wiring rules)
Always ask your installer for their CoC — it's your proof the work was done legally and safely.
What About the Refrigerant Pipework?
The refrigerant pipework connecting the indoor and outdoor units also requires a certified refrigeration technician who holds the appropriate refrigerant handling licence. This is a separate requirement from the electrical work. A reputable heat pump installer will hold both qualifications or work as part of a team that does.
Building Code Compliance Still Applies
Even when no building consent is required, the installation must still comply with the NZ Building Code. Key clauses to be aware of include:
| Building Code Clause | Relevance to Heat Pump Installation |
|---|---|
| E2 – External Moisture | Pipe penetrations through exterior walls must be properly flashed and sealed |
| G4 – Ventilation | Adequate ventilation in the space being conditioned |
| H1 – Energy Efficiency | Insulation and energy performance of the building envelope |
A good installer will ensure all penetrations are properly sealed and weatherproofed to prevent moisture ingress — a common issue in NZ homes, particularly in wetter regions like the West Coast or Northland.
Healthy Homes Standards and Rental Properties
If you're a landlord installing a heat pump to meet the Healthy Homes Standards, the unit must meet specific heating capacity requirements. Tenancy Services provides detailed guidance on what's required, including minimum kilowatt output based on the size of the main living area. Compliance deadlines have applied to most rental properties, so check the current requirements if you're a landlord.
Placement and Noise Considerations
The outdoor unit of a heat pump can sometimes be subject to district plan rules around noise and proximity to boundaries. In some cases, resource consent (not building consent) could be required if the unit is very close to a neighbour's boundary. Check with your local council or refer to MBIE Building Performance for guidance.
When to Call a Professional
For virtually every heat pump installation, you should be engaging a qualified heat pump installer — someone who is a registered electrician with refrigerant handling certification. DIY heat pump installation is not legal in New Zealand due to the restricted electrical and refrigerant work involved.
A professional installer will:
- Assess the right size and type of unit for your home
- Ensure the installation is Building Code compliant
- Handle all electrical and refrigerant work legally
- Provide the required Certificate of Compliance
- Advise you on whether a building consent is needed for your specific situation
You can find qualified heat pump installers in your area on tradedirectory.co.nz.
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