Plumber vs. Gas Fitter: What's the Difference (and Why It Matters in Victoria)

If your hot water's out, a pipe's leaking, or you can smell gas, the trade you call first actually matters. In Victoria, plumbing and gasfitting are two separate licensed classes of work — holding one doesn't automatically qualify someone for the other. Call the wrong trade and the most likely outcome is a second call-out, a second invoice, or a delay you didn't need. Here's exactly what a plumber covers, what a gas fitter covers, where the two genuinely overlap, and how to know which one your job needs.

Key Takeaways

• Victoria recognises seven main classes of plumbing work — Drainage, Gasfitting, Irrigation, Mechanical Services, Roofing, Sanitary, and Water Supply — each requiring its own registration or licence under the Building and Plumbing Commission (BPC).
• A plumbing licence doesn't automatically include gasfitting authorisation, and a gasfitting licence doesn't automatically include general plumbing work — they're separate classes, not one bundled qualification.
• A plumber handles water supply, drainage, and sanitary work — taps, toilets, blocked drains, burst pipes, and the water side of a hot water system.
• A gas fitter handles the gas side: connecting gas lines, installing and servicing gas appliances, and diagnosing gas leaks.
• If you smell gas, that's a job for a licensed gas fitter (or, in an immediate emergency, Triple Zero) — not a wait-and-see situation.

Plumber vs. gas fitter, at a glance

What does a plumber actually do?

A plumber's licensed scope covers water supply, drainage, and sanitary plumbing — anything to do with water coming in, wastewater going out, and the fixtures in between. Day to day, that means jobs like:

• Fixing a leaking tap or running toilet — replacing washers, cartridges, or the whole fixture.
• Clearing a blocked drain or sewer — using drain snakes, jet blasting, or camera inspection to find and fix the blockage.
• Repairing a burst or broken pipe — locating the break, cutting out the damaged section, and rejoining or replacing it.
• Installing or servicing the water side of a hot water system — connecting the cold water inlet, the hot water outlet, and the pressure relief valve.

A plumbing licence alone does not authorise gas appliance or gas line work. That's a separate class entirely — which is exactly where a gas fitter comes in.

What does a gas fitter actually do?

A gas fitter's licensed scope covers the connection, installation, and servicing of gas lines and appliances — natural gas and LPG alike. In practice, that includes:

• Connecting a new gas line — running gas piping from the meter to a new appliance or outlet, and pressure-testing the line before it's signed off.
• Installing gas appliances — cooktops, gas heaters, and the gas-burner side of a gas hot water system.
• Diagnosing and repairing a gas leak — testing fittings and joints, and making the site safe before repair work starts.
• Servicing existing gas appliances — routine maintenance and fault-finding on equipment already installed.

Victoria's Gas Safety Act 1997 further splits gas appliances into two types. Type A covers typical household equipment — cooktops, room heaters, and most residential gas hot water systems. Type B covers larger, higher-input, or more complex systems, common in commercial settings. A gas fitter needs to be qualified for the specific appliance type they're working on, not just "gasfitting" as a blanket qualification.

Why the distinction matters in Victoria

This isn't just industry trivia — it's how the regulation is actually structured. Under theBuilding and Plumbing Commission (formerly the Victorian Building Authority), plumbing work in Victoria is organised into seven distinct main classes: Drainage, Water Supply, Sanitary, Roofing, Mechanical Services, Irrigation, and Gasfitting. A plumbing practitioner must hold current registration or a licence in each specific class of work they carry out. Being licensed in Drainage or Water Supply doesn't automatically extend to Gasfitting. The reverse is also true.

Practically, this means a plumber who isn't also a licensed gas fitter genuinely cannot lawfully connect your gas cooktop or diagnose a gas leak. It's not a matter of preference — it's what their licence actually covers. It's a completely reasonable question to ask directly before booking a job: "are you licensed for gasfitting as well as plumbing?" A properly licensed tradesperson will answer that immediately and without hesitation.

Not sure which one your job needs, or whether it's actually both?Get in touch and describe what's going on — we'll tell you straight which trade the job requires, no guesswork needed.

Where the line blurs: jobs that need both

The clearest overlap is a gas hot water system. Connecting the unit's cold water inlet and hot water outlet is plumbing work. Connecting the gas line to the burner, and commissioning the appliance, is gasfitting work. Both trades are genuinely required on a single job — which is exactly why many practitioners, including our own team, hold both licences rather than one.

Electric hot water systems sit slightly differently again. The water-side connection is still plumbing work, but the electrical element and wiring is licensed electrical work — a third trade, not a gas fitter.

Frequently asked questions

Does a plumber or an electrician install a hot water heater?

Depends on the fuel type. A gas hot water system needs a plumber for the water side and a gas fitter for the gas connection — often the same licensed person. An electric storage or heat pump system needs a plumber for the water side and a licensed electrician for the electrical connection.

Can I do any gas work myself?

No. Gas work in Victoria must be carried out by a registered or licensed gas fitter, full stop — this isn't a DIY-if-you're-careful situation. Unlicensed gas work is illegal, voids insurance, and carries genuine safety risks including leaks and carbon monoxide exposure.

Who do you call for a suspected gas leak?

If you smell gas strongly or hear hissing near a gas fitting, leave the property and avoid switches or naked flames. Call Triple Zero (000) if there's any immediate danger. Once the immediate safety risk is handled, a licensed gas fitter is who diagnoses and repairs the leak itself.