Gas is one of the most tightly regulated trades in New Zealand — and for good reason. A mistake with gas pipework or appliances can cause fires, explosions, or carbon monoxide poisoning. Before you pick up a spanner, it's essential to understand exactly where the legal line sits between DIY and restricted work.
Why Gas Work Is So Strictly Regulated
In New Zealand, gas work is governed by the Gas Act 1992 and the Gas (Safety and Measurement) Regulations 2010. These laws exist to protect you, your family, and your neighbours. The Plumbers, Gasfitters and Drainlayers Board (PGDB) is the licensing authority responsible for setting and enforcing the rules around who can legally carry out gas work.
Unlicensed gas work is not just dangerous — it's illegal and can void your home insurance. If something goes wrong and an unlicensed person did the work, you may face serious legal and financial consequences.
What Is Considered Restricted Gas Work?
Restricted work means any work on gas installations, fittings, or appliances that must be carried out by a licensed gasfitter. This covers a very wide range of tasks, including:
- Installing, altering, repairing, or replacing any gas pipework (including flexible hoses connected to the fixed supply)
- Connecting or disconnecting gas appliances to the fixed gas supply
- Installing or replacing gas meters, regulators, or valves
- Installing or servicing gas water heaters, heaters, cooktops, or ovens
- Any work on LPG cylinder connections beyond swapping a standard snap-on fitting
- Commissioning or testing gas installations
- Any work on flues, venting, or combustion air systems for gas appliances
If in doubt, the safest rule is: if it involves gas pipework or a fixed connection, it's restricted work.
What Can a Homeowner Legally Do?
The good news is there are a small number of tasks homeowners can do themselves without a licence:
- Swapping an LPG cylinder on a barbecue or portable appliance using a standard snap-on (POL or quick-connect) fitting — no tools or pipe connections required
- Moving a freestanding gas appliance (such as a portable gas heater) that uses a flexible hose with a bayonet or snap-on fitting, as long as you are not modifying any pipework
- Cleaning or replacing burner caps on a gas cooktop (maintenance only, no gas connections involved)
- Reporting a gas leak — call your gas retailer or WorkSafe NZ emergency line immediately and evacuate
That's essentially it. The list of legal DIY gas tasks is deliberately short.
Natural Gas vs LPG: Does It Make a Difference?
The same restrictions apply to both natural gas (reticulated) and LPG (bottled). Many homeowners assume LPG is less regulated because the cylinders are portable, but the law treats both fuel types the same when it comes to fixed installations and connections.
| Task | Natural Gas | LPG |
|---|---|---|
| Swap BBQ cylinder (snap-on) | N/A | ✅ Homeowner OK |
| Connect appliance to fixed supply | ❌ Licensed only | ❌ Licensed only |
| Replace flexible hose on fixed fitting | ❌ Licensed only | ❌ Licensed only |
| Install new gas line | ❌ Licensed only | ❌ Licensed only |
| Service gas water heater | ❌ Licensed only | ❌ Licensed only |
Certificates of Compliance
Whenever a licensed gasfitter completes restricted work, they are legally required to issue you a Certificate of Compliance (CoC). This document confirms the work meets the NZ Building Code and relevant standards. Always ask for your CoC and keep it with your home records — you'll need it if you sell your home or make an insurance claim.
Carbon Monoxide: The Hidden Danger
Carbon monoxide (CO) is an odourless, colourless gas produced by faulty or poorly ventilated gas appliances. It can be fatal. This is one of the key reasons gas appliance installation and servicing must be done by a professional. Consider installing a CO alarm near any gas appliances in your home — it's a simple, affordable safety measure that could save lives. BRANZ provides useful guidance on ventilation and indoor air quality for NZ homes.
When to Call a Professional
You should always call a licensed gasfitter for:
- Any new gas installation or extension of existing pipework
- Replacing or installing a gas appliance (heater, cooktop, oven, hot water cylinder)
- Suspected gas leaks or appliance faults
- Annual servicing of gas appliances — especially flued heaters and water heaters
- Any work required before a property sale or rental compliance check under the Healthy Homes Standards
To find a qualified, local gasfitter you can trust, search the trade directory at tradedirectory.co.nz. Always check that your gasfitter holds a current licence — you can verify this on the PGDB licence register.
Safety First: If You Smell Gas
- Do not operate any switches, appliances, or open flames
- Open windows and doors
- Evacuate the building
- Call your gas supplier or 111 from outside
- Do not re-enter until cleared by a professional
Sources & Further Reading
- Plumbers, Gasfitters and Drainlayers Board (PGDB) — licence verification and regulations
- WorkSafe NZ — Gas Safety — workplace and home gas safety guidance
- MBIE Building Performance — NZ Building Code and compliance information
- BRANZ — research and guidance on safe building practices
- Tenancy Services — Healthy Homes — heating and ventilation standards for rental properties