In most cases, installing a new gas appliance in a New Zealand home does not require a building consent — but that doesn't mean you can do it yourself. All gas installation work is restricted work under NZ law and must be carried out by a licensed gasfitter. Getting this wrong can be dangerous and may void your insurance.
What the NZ Building Code Says
The NZ Building Code sets out the minimum standards for all building work, including gas installations. Gas appliances must comply with G10 (piped gas) provisions, which cover the safe supply and use of gas in buildings. However, simply connecting or replacing a gas appliance is generally considered exempt building work under Schedule 1 of the Building Act 2004 — meaning no building consent is required for the installation itself.
That said, the exemption applies only when the work is carried out correctly and by the right person. Always confirm with your local council if you're unsure whether your specific project falls within Schedule 1 exemptions, as circumstances can vary.
When a Building Consent IS Required
While the appliance connection itself is usually exempt, a building consent may be required if your installation involves:
- New or extended gas pipework that forms part of the building's structure or penetrates fire-rated walls
- Installing a flue or chimney for a gas fire or range hood that requires structural work
- Converting a room or altering the building to accommodate a new appliance (e.g., adding a gas fireplace to a room that didn't have one)
- Commercial premises, where different rules often apply
- New LPG or natural gas supply connections that involve significant infrastructure changes
If your project involves any structural, drainage, or ventilation changes alongside the gas work, check with your local council before starting. The MBIE Building Performance website has detailed guidance on what requires consent and what doesn't.
All Gas Work Is Restricted — Here's Why That Matters
Regardless of whether a building consent is needed, all gas fitting work in NZ is restricted work under the Gas Act 1992. This means it must be performed by a gasfitter who is licensed and registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB).
This includes:
- Connecting any new gas appliance (cooktop, oven, heater, hot water system, BBQ point)
- Installing or modifying gas pipework
- Commissioning and testing gas systems
- Certifying that the work is safe
A licensed gasfitter will issue you a Certificate of Compliance (CoC) once the work is done. This document is important — keep it safe, as you may need it when selling your home or making an insurance claim.
What Can a Homeowner Do?
As a homeowner, you can:
- Choose and purchase your gas appliance
- Move furniture and prepare the space
- Discuss the layout and appliance placement with your gasfitter
You cannot legally connect, disconnect, or modify any gas fitting or pipework yourself, even if it looks straightforward. Attempting to do so is illegal and extremely dangerous.
Safety First — Don't Cut Corners
Improper gas installations can cause gas leaks, fires, explosions, and carbon monoxide poisoning. Carbon monoxide is odourless and colourless — it can be fatal before you even realise there's a problem. WorkSafe NZ takes gas safety seriously, and unlicensed gas work can result in significant fines.
Always:
- Use a PGDB-registered gasfitter (you can verify their licence on the PGDB website)
- Ensure you receive a Certificate of Compliance after the job
- Install a carbon monoxide detector near gas appliances, especially in sleeping areas
- Have your gas appliances serviced regularly
Natural Gas vs LPG — Does It Make a Difference?
The rules are the same whether you're on natural gas (reticulated mains supply) or LPG (bottled gas). Both require a licensed gasfitter for any connection or installation work. If you're switching from LPG to natural gas or vice versa, your gasfitter will also need to ensure your appliances are correctly configured for the fuel type, as burner jets and regulators differ between the two.
Replacing an Existing Appliance
Swapping a like-for-like appliance — for example, replacing an old gas hob with a new one in the same location — is typically straightforward and unlikely to need a building consent. However, it still must be done by a licensed gasfitter. Never assume a plumber or electrician can do gas work unless they also hold a gasfitting licence.
When to Call a Professional
You should always call a licensed gasfitter for any gas appliance installation, replacement, or modification. If your project also involves structural changes, new flues, or alterations to the building, contact your local council to check whether a building consent is needed before work begins. A good gasfitter will often be able to advise you on this as well.
You can find qualified, local gasfitters in your area right here on tradedirectory.co.nz.
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