Short answer: In Australia, you must not replace your own gas cooktop. Any work that connects, disconnects, installs or alters a gas appliance is gasfitting work and must be done by a licensed gasfitter. Doing it yourself is illegal and unsafe, and in Victoria, it also triggers compliance-certificate rules for many jobs.
Why the answer is ‘no’ – the rules in plain English
Under Victorian regulations, gasfitting covers construction, installation, replacement, repair, alteration, testing and commissioning of any gas pipe, fitting or appliance downstream of the meter. That includes swapping a cooktop. Only registered or licensed gasfitters are allowed to do this work.
Those licensed gasfitters must follow the national installation standard AS/NZS 5601 to ensure the cooktop is installed and ventilated correctly. This standard covers things like clearances to combustibles, flame-failure requirements, and correct connection methods.
For many Victorian jobs, a plumbing compliance certificate is required when the value of work is $750 or more or for certain classes of gasfitting. Your gasfitter issues this within five business days. It’s your proof that the work was done legally and to standard, and it protects you if something fails later.
What can go wrong if you DIY?
Replacing a gas cooktop isn’t just dropping a new unit in the hole. It involves gas-tight connections, pressure checks, ventilation checks, ignition safety and leak testing. Getting any of that wrong can mean:
- Gas leaks: fire or explosion risk, and usually no insurance cover if it was DIY.
- Carbon monoxide hazards: poor combustion or wrong jets can create invisible, odourless CO.
- Non-compliance: fines for illegal gas work and potential problems with future building or insurance claims.
Australian regulators are clear: don’t do your own gasfitting. Only a licensed gasfitter can legally and safely complete the job.
What you can do yourself vs what a pro must do
| Task | You (homeowner) | Licensed gasfitter |
|---|---|---|
| Measure the benchtop cut-out, choose a like-for-like cooktop | ✅ | — |
| Remove drawers or nearby items for access, clean the cavity | ✅ | — |
| Disconnect old cooktop from gas, cap pipework | ❌ | ✅ |
| Fit new isolation valve or regulator (if required) | ❌ | ✅ |
| Connect, leak-test and commission the new unit | ❌ | ✅ |
| Verify clearances, ventilation and flame-failure safety | ❌ | ✅ |
| Issue compliance certificate (where required in VIC) | ❌ | ✅ |
If your benchtop needs alterations or you are moving the appliance location, you may also need a cabinetmaker. For any electrical outlet work, you will need a licensed electrician. Your gasfitter can advise and coordinate.
How a proper replacement is done
A good cooktop swap is quick and tidy when you’ve got the right licence, tools and parts on hand. Here’s the typical process Heat & Cool follows for a straight replacement:
- Pre-check: confirm model, gas type (natural or LPG), cut-out size, ventilation and compliance items.
- Isolate and disconnect: shut off gas, disconnect old unit, check the condition of the valve and pipework.
- Fit and secure: seat the new cooktop level, secure brackets, confirm clearances to splashbacks and cabinetry.
- Connect and seal: connect using approved fittings and thread sealant, then pressure-test and leak-test.
- Commission: check ignition, flame stability, simmer control and flame-failure shut-off. Convert jets if required.
- Final paperwork: provide a compliance certificate where applicable and note any usage or care tips.
The result you feel at home is simple: burners light first time, flames are even and blue, simmer is stable, and the kitchen smells like dinner, not gas.
Signs you should replace, not just repair
Sometimes repairing the old unit makes sense; other times, a swap is smarter. Consider replacing if:
- The glass is cracked or the chassis is heat-warped.
- Ignition modules, valves and burners are failing repeatedly.
- Spare parts are obsolete, or quotes are approaching half the price of a new unit.
- You’re changing fuel type or upgrading to flame-failure safety across all burners.
Not sure? We’ll price both repair and replacement so you can choose with confidence.
Safety, insurance and resale: why the paperwork matters
That compliance certificate isn’t just a formality. It tells future buyers, property managers and insurers that the appliance was installed legally and to standard. It also creates accountability; the licensed gasfitter’s details are on the record with the regulator.
Skipping this can create headaches at sale time or when making an insurance claim after a kitchen incident.
Costs and timing, what to expect
- Standard like-for-like swap: usually a short site visit when access is good and the cut-out matches.
- Extra time: allow for jet conversion (natural gas to LPG or vice versa), damaged valves, or cabinetry adjustments.
- Upfront quote: we confirm the scope before work starts and flag any compliance items that add cost, for example, replacing a non-compliant flex hose or adding an isolation valve to meet current standards.
Trust the professionals. Contact Heat and Cool today.
Replacing a gas cooktop yourself might look straightforward, but the legal, safety and insurance risks are not.
If your old cooktop is playing up, slow ignition, uneven flames, a faint gas smell, don’t risk it. Book a licensed replacement or repair with Heat & Cool and get a safe, compliant install backed by the right paperwork. Dinner will be back on track.
Frequently Asked Questions
Can I disconnect my old cooktop to save money?
No. Disconnecting is gasfitting work and must be done by a licensed gasfitter. DIY gas work is illegal and unsafe.
Do I really need a compliance certificate in Victoria?
For many jobs you do. When the value is $750 or more or for specified gasfitting classes, your plumber must issue a compliance certificate within five business days. Keep it with your home records.
Is there a national rule the installer follows?
Yes. Installers work to AS/NZS 5601 for gas installations, which sets out the safety rules for installing and commissioning appliances like cooktops.
Can I at least cut a bigger hole in the bench for a new gas cooktop?
You can do cabinetry prep, but any change that affects clearances to combustibles or ventilation still has to be checked by the gasfitter before connection. They are responsible for compliance at handover.
How do I check a gasfitter is properly licensed?
In Victoria, gasfitters are registered or licensed via the VBA. Ask to see the card or search the VBA register. Energy Safe Victoria also links to licensing information.
