No, you cannot legally install a gas bayonet fitting yourself in New Zealand. This type of work is classified as restricted gasfitting work under the Plumbers, Gasfitters, and Drainlayers Act 2006, meaning it must be carried out by — or under the direct supervision of — a licensed gasfitter. Attempting to do it yourself is not only illegal but potentially life-threatening.
What Is a Gas Bayonet Fitting?
A gas bayonet fitting (sometimes called a bayonet outlet or quick-connect fitting) is a wall or floor outlet that allows you to connect a portable gas appliance — such as a gas heater or cooktop — using a flexible hose with a push-and-twist connector. They're common in NZ homes and are a convenient way to use LPG or natural gas appliances without permanent pipework connections.
While the fitting itself looks simple, it connects directly to your home's gas supply pipework, which is why the installation is tightly regulated.
Why Is It Restricted Work?
Gas installations gone wrong can cause gas leaks, fires, explosions, and carbon monoxide poisoning — all of which can be fatal. Because of these serious risks, the NZ government classifies the installation, alteration, or connection of any gas fitting (including bayonet outlets) as restricted work under the Plumbers Gasfitters & Drainlayers Board (PGDB) framework.
Only the following people can legally carry out this work:
- A licensed gasfitter (certifying or craftsman level)
- A trainee gasfitter working under direct supervision of a licensed gasfitter
Once the work is complete, the licensed gasfitter must issue you a Certificate of Compliance (CoC), which is your legal proof that the work was done correctly and to the NZ Building Code.
What Can a Homeowner Do?
As a homeowner, there are a few things you can do yourself around gas bayonet fittings:
- Connect and disconnect a compliant flexible hose to an existing, already-installed bayonet fitting
- Move a portable gas appliance from one bayonet outlet to another
- Report a suspected gas leak — if you smell gas, leave the area, don't operate any switches, and call your gas supplier or 111 immediately
What you cannot do yourself includes:
- Installing a new bayonet outlet
- Relocating or extending the gas pipework to a new position
- Replacing or modifying an existing bayonet fitting in the wall or floor
- Connecting any fixed gas appliance
The Risks of DIY Gas Work
Beyond the legal consequences (which can include significant fines), DIY gas work carries serious safety risks:
- Gas leaks from poorly fitted connections can accumulate undetected and ignite
- Carbon monoxide is odourless and colourless — a faulty installation can allow it to build up indoors with deadly results
- Insurance issues — if a gas-related incident occurs and unlicensed work is discovered, your home insurance may be void
- Selling your home — uncertified gas work can complicate or delay a property sale, as LIM reports and building inspections may flag it
WorkSafe NZ provides guidance on gas safety obligations for homeowners and the serious consequences of non-compliant installations.
Does It Need a Building Consent?
In most cases, installing a gas bayonet fitting does not require a building consent — it typically falls under Schedule 1 of the Building Act 2004 as exempt work. However, this depends on the scope of work and your local council's interpretation. Always check with your local council before starting any work to confirm whether consent is needed in your specific situation.
Regardless of consent requirements, the gasfitting work itself still requires a licensed gasfitter and a Certificate of Compliance. You can find more information on building consent exemptions at MBIE Building Performance.
What to Expect When Hiring a Licensed Gasfitter
When you engage a licensed gasfitter to install a bayonet fitting, here's a general idea of what the process looks like:
| Step | What Happens |
|---|---|
| Assessment | Gasfitter checks existing pipework, gas type (LPG or natural gas), and suitable location |
| Installation | Fitting is installed and connected to the gas supply pipework |
| Pressure testing | The system is tested for leaks |
| Certificate of Compliance | Gasfitter issues a CoC — keep this document safe |
As a rough guide, a straightforward bayonet fitting installation by a licensed gasfitter may cost anywhere from a few hundred dollars upward, depending on the complexity, location, and travel time — but get quotes from local tradespeople for accurate pricing.
When to Call a Professional
You should call a licensed gasfitter any time you want to:
- Install a new gas bayonet outlet anywhere in your home
- Move or modify an existing outlet
- Add additional gas points for a new appliance
- Have your existing gas installation inspected or certified
You can find qualified, licensed gasfitters in your area right here on tradedirectory.co.nz. Always ask to see their PGDB licence before work begins — you can verify a gasfitter's licence on the PGDB website.