The short answer
If you’re installing a heat pump in New Zealand, you usually need licensed or authorised tradespeople for the parts of the job that involve electrical connections and refrigerant handling. Some preparation and minor finishing tasks can be DIY, but the actual installation is not a simple “plug it in yourself” job.
The law matters here because a heat pump is not just a box on the wall. Most systems involve mains power, a refrigerant circuit, condensate drainage, wall penetration, and sometimes building or consent-related work depending on the location and type of installation. Getting the wrong person for the job can create safety issues, void warranties, and make life difficult when you sell the house or claim on insurance.
What “licensed” means for heat pump work in NZ
In New Zealand, there isn’t one single “heat pump licence” that covers every part of every installation. Instead, different parts of the work are regulated by different rules:
- Electrical work is regulated under the Electricity (Safety) Regulations and generally must be done by a registered electrician, or by someone legally allowed to do prescribed electrical work under supervision.
- Refrigerant handling is not something a homeowner should do. The person working on the gas side of the heat pump should be appropriately trained and, where relevant, authorised to work with refrigerants and follow environmental and safety requirements.
- Building work such as structural modifications, major wall changes, or external alterations may need a building consent from your local council.
- Plumbing/drainage work can come into play if condensate disposal involves alterations to plumbing or drainage systems.
In practical terms, if a contractor says they can do the whole install, ask exactly who is doing the electrical connection, who is handling the refrigerant side, and whether that work is being done by qualified people with the right registrations.
What parts of a heat pump install are DIY-legal?
Some prep and finishing tasks are usually fine for homeowners, provided you do not cross into regulated work. Typical DIY-friendly tasks can include:
- choosing the room and preferred indoor location
- clearing access to the install area
- removing furniture and wall hangings
- basic painting or patching after the job is finished
- minor cleaning and tidying around the unit
- sometimes simple mounting preparation if the installer specifically asks for it and it does not involve electrical or structural work
However, you should not assume DIY is legal for:
- connecting the unit to mains power
- running or altering fixed wiring
- opening refrigerant lines or handling refrigerant gas
- making structural changes to walls or framing without checking consent requirements
- modifying drainage in a way that falls under regulated plumbing/drainlaying work
If you are buying a DIY heat pump kit, be very careful. The kit itself might be sold legally, but that does not mean the installation can be completed safely or lawfully by an unqualified person.
What work must be done by the right tradespeople?
The table below gives a practical guide for common heat pump installation tasks.
| Task | Can a homeowner do it? | Who usually needs to do it? | Notes |
|---|---|---|---|
| Choosing a unit and comparing quotes | Yes | Homeowner | Get multiple written quotes and compare capacity, warranties, and running costs. |
| Wall mounting indoor/outdoor units | Sometimes, but usually not recommended | Installer | Needs safe fixing, correct spacing, and careful alignment. |
| Electrical connection to fixed wiring | No | Registered electrician | This is the area most likely to require licensing/authorisation. |
| Refrigerant pipework and gas handling | No | Qualified/authorised technician | Incorrect handling can be dangerous and may breach warranty conditions. |
| Condensate drainage | Limited DIY only | Installer/plumber/drainlayer if required | Depends on how the system is drained and whether existing plumbing is altered. |
| Core drilling or wall penetrations | Sometimes, with care | Installer or builder | May affect structure, weather-tightness, or insulation. |
| Exterior unit pad or bracket installation | Sometimes | Installer/builder | Must be secure, level, and suitable for NZ wind and weather exposure. |
| Final testing and commissioning | No | Installer | A proper handover should include testing and documentation. |
The key point is that a heat pump installation is often a combined job. Even if one part looks simple, the overall installation usually still requires professionals.
Why unlicensed work is risky
The risks of using an unqualified installer are not just theoretical. In New Zealand, they can show up in very practical ways.
1) Safety risks
A poorly installed heat pump can cause:
- electric shock or fire risk if wiring is incorrect
- refrigerant leaks
- poor drainage leading to mould or water damage
- unit failure during a cold snap or heatwave
- unsafe outdoor mounting, especially in high-wind areas
This matters in winter because homeowners often rush to replace failing heating when temperatures drop. But fast decisions can be expensive if the job has to be redone.
2) Insurance problems
If unlicensed or non-compliant work contributes to damage, your insurer may ask:
- who did the work
- whether they were appropriately qualified
- whether the installation met manufacturer instructions and NZ requirements
- whether any required consent or compliance documentation exists
That does not automatically mean every claim will be declined, but incomplete or improper work can make a claim harder to prove and settle.
3) Resale and disclosure issues
When you sell a home, buyers and solicitors may ask for evidence that the work was done properly. If a heat pump was installed badly, you may be asked to provide:
- invoices
- electrical certificates or compliance documentation
- council consent records, if applicable
- warranty paperwork
Missing paperwork can reduce buyer confidence and, in some cases, affect the sale price or create last-minute negotiations.
4) Warranty and performance problems
Manufacturers often require installation by qualified people. If the installation was not done according to the manufacturer’s instructions, you could face:
- a voided warranty
- reduced efficiency
- more breakdowns
- louder operation
- shortened lifespan of the unit
5) Legal and compliance issues
If the job includes electrical work or work that should have had council approval, non-compliance can create ongoing liability. It is much cheaper to do the job right once than to rip it out and fix it later.
When might you need building consent or council input?
Not every heat pump installation needs a building consent, but some situations are more complicated than a straightforward replacement. Check with your local council if the job involves:
- significant changes to external walls or cladding
- structural modifications to support a heavy unit or bracket
- work in a heritage, apartment, or multi-unit building with body corporate rules
- major penetrations that could affect weather-tightness
- anything that changes the building envelope in a material way
If the installation is a like-for-like replacement in a simple location, consent may not be required. But “may not” is not the same as “definitely not”, so it is worth confirming before work starts.
How to check whether a heat pump installer is properly qualified
Before you book, ask for specifics rather than taking broad claims at face value.
Look for:
- a clear written quote itemising labour, materials, and any electrical or additional work
- the installer’s company details and GST number, if applicable
- evidence of the electrician’s registration, if electrical work is included
- confirmation of who is doing refrigerant-related work
- references from recent NZ installations
- warranty terms in writing
- confirmation of any expected council documentation or sign-off
You can also ask:
- Will you provide commissioning paperwork?
- Who handles the electrical connection?
- Is the outdoor unit mounted to a wall, stand, or pad?
- Do you expect any extra costs for access, drilling, or long pipe runs?
- Will I receive manuals and warranty documents on completion?
A good installer should answer these questions clearly and without evasion.
Getting quotes: what to compare beyond price
Heat pump prices in NZ can vary widely depending on the size of the unit, brand, access, and whether the job is a simple replacement or a new install. It’s sensible to get at least two or three written quotes.
Don’t just compare the bottom line. Check:
- unit capacity for the room size and use case
- whether the quote includes removal of the old unit
- electrical work and isolation switch requirements
- mounting method and weather protection
- condensate drainage solution
- travel, access, or after-hours charges
- warranty length and what it covers
A cheap quote can become expensive if it excludes the very work needed to make the system compliant and reliable.
Signs you should walk away
Be cautious if an installer:
- says electrical work is “no big deal” or suggests you can finish it yourself
- refuses to explain who is doing the licensed parts of the job
- won’t provide a written quote
- pressures you to pay cash only
- can’t explain warranty conditions
- dismisses consent or compliance questions as unnecessary without checking your specific situation
If the answers are vague before you pay, they are unlikely to become more helpful after the job goes wrong.
The bottom line for NZ homeowners
For most homes in New Zealand, you should expect a heat pump installation to involve licensed or properly qualified professionals for the electrical and refrigerant-related parts of the job. Minor prep or cosmetic work may be DIY-legal, but the core installation is not something to treat as a casual weekend project.
The safest approach is to get multiple written quotes, check who is actually doing each part of the work, and confirm whether any council approval is needed before installation starts. That gives you a better chance of a safe, efficient system that holds up for winter, passes scrutiny if you sell, and doesn’t create insurance headaches later.
ISO 9001
