Gas fitting licence in Australia: state regulators, AS/NZS 5601 and compliance

What it is

A gas fitting licence is the legal authority to install, alter, repair or connect a gas appliance or gas piping system. In Australia gas fitting is regulated state by state, not federally. Every jurisdiction has its own gas safety Act, its own technical regulator and its own licence form, but they all sit on top of the same technical standard: AS/NZS 5601 Gas installations. Unlicensed gas work is illegal in every state and territory.

The technical standard that sits across the country

AS/NZS 5601.1 covers general gas installations and AS/NZS 5601.2 covers LP Gas installations in caravans, boats and similar mobile work. Both are issued by Standards Australia. They are picked up by reference in the gas safety regulations of every state, so the standard is enforceable as if it were the law itself.

The standard sets out pipe sizing, ventilation, appliance clearances, flueing and pressure testing. A residential plumber doing a hot water unit swap is working under the same standard as a commercial gas fitter on a high-rise. Scale changes; the rules do not.

Who issues licences in each state

Gas fitting licences sit with the building or energy safety regulator in each state, not always with the same body that licenses plumbing. The general split:

New South Wales

NSW Fair Trading issues a gasfitting endorsement on a plumbing licence. The Plumbing and Drainage Act 2011 (NSW) and the Gas and Electricity (Consumer Safety) Act 2017 (NSW) both apply.

Victoria

The Victorian Building Authority issues the gasfitting class of plumber's licence. Gas safety incidents are notified to Energy Safe Victoria, which sits under the Gas Safety Act 1997 (Vic).

Queensland

The QBCC handles plumbing, but gas work is licensed under the Petroleum and Gas (Production and Safety) Act 2004 (Qld). A residential plumber needs both a QBCC plumbing licence and a Gas Work Authority for gas work.

Western Australia

The Building Commission within the Department of Energy, Mines, Industry Regulation and Safety issues gas fitting permits and licences under the Gas Standards Act 1972 (WA).

South Australia, Tasmania, ACT, NT

Each has its own technical regulator, but the licensing follows the same pattern of a separate gas endorsement on a plumbing-style licence.

LPG versus natural gas

The two fuels are treated differently in three places that matter on a residential job. First, appliances are approved separately. An appliance approved for natural gas may not be safe on LPG without an internal conversion kit. Second, the pressure ranges differ, so the pipe sizing and regulator selection in AS/NZS 5601.1 give different answers. Third, leak detection and ventilation rules respond to the fact that LPG is heavier than air and natural gas is lighter, which changes how a vented cavity must be designed.

A licensed gas fitter is trained on both, but the licence may carry restrictions. Always check the wording on the licence before assuming the trade can do an LPG conversion on a cooktop.

Pressure testing and compliance

Every gas installation must be pressure tested before it is put into service. AS/NZS 5601.1 sets the test pressures and the hold times by pipe diameter and material. The fitter records the test result and includes it on the gas compliance form lodged with the state regulator and given to the owner.

The compliance form is the equivalent of a plumbing Certificate of Compliance for gas work. Without it, the work is not lawfully complete. Insurers and conveyancers will ask for it on transfer of the property, sometimes years later.

What a builder must check

Three things matter on every residential gas job:

The fitter holds a current gas work licence or endorsement issued by the regulator in the state where the work is being done. An interstate licence does not transfer automatically.

The appliance is approved for the fuel type being supplied. The Australian Gas Association approval mark or the equivalent regulator approval is on the data plate.

The pressure test and the gas compliance form are completed before commissioning, and a copy of the form ends up in the project file. No form, no final inspection.

When the rules change

Gas safety is one of the more actively amended areas of building regulation. AS/NZS 5601 is reissued every few years and state regulations are updated to pick up the new edition. Always work from the current standard, not the one bookmarked five years ago.