If you smell rotten eggs, hear hissing near a gas line, or notice dead patches of grass above underground pipes, treat it as a potential gas leak and act immediately — leave the area, avoid using anything electrical, and call your gas distributor's emergency line or 000. An emergency plumber who is licensed to work on gas fitting can assess and repair the problem once the scene has been made safe by emergency services.
What a gas leak actually looks, smells, and sounds like
Natural gas is colourless and largely odourless in its raw form, which is why Australian gas distributors add a chemical called mercaptan to give it the distinctive smell of rotten eggs or sulphur. That smell is your most reliable early warning signal indoors. Outdoors, the signs are less obvious and require closer attention.
Common indicators of a gas leak include:
- Smell: A persistent rotten-egg or sulphur odour that does not go away when you open windows. - Sound: A hissing, whistling, or roaring noise near a gas meter, appliance connection, or underground pipe. - Sight: Dead or discoloured patches of vegetation in a line across your yard, bubbling in standing water or wet soil, or a visible white mist or fog near a gas line. - Physical symptoms: Dizziness, nausea, headaches, or difficulty breathing when indoors. These symptoms can indicate carbon monoxide exposure from incomplete combustion, which is a related but distinct hazard.
If you notice any combination of these signs, do not try to diagnose the problem yourself. A suspected gas leak is always an emergency.
Immediate steps to take if you suspect a gas leak
Your response in the first few minutes matters enormously. Follow these steps in order:
1. Do not use any switches, appliances, or open flames. This includes light switches, mobile phones (if possible, move outside first), lighters, candles, and electric garage doors. Any spark can ignite accumulated gas. 2. Leave the building immediately. Leave doors open as you exit to allow ventilation. Do not stop to collect belongings. 3. Turn off the gas at the meter only if it is safe to do so on your way out and you know how. The isolation valve on a standard Australian gas meter is turned perpendicular to the pipe to shut off supply. 4. Move well away from the building before using your mobile phone or any electronic device. 5. Call 000 if you believe there is immediate danger to life, or if the leak is large and affecting neighbouring properties. 6. Call your gas distributor's 24-hour emergency number. This number is printed on your gas bill and on the meter itself. Do not re-enter the building until emergency services give the all-clear.
Do not attempt to locate or repair the leak yourself. Gas fitting work in Australia must be performed by a licensed gasfitter -- attempting it without a licence is illegal in every state and territory.
When to call an emergency plumber versus 000
Calling 000 is appropriate when there is an immediate risk to life: a large leak inside a building, an unconscious person, or fire. Emergency services will isolate the supply and ventilate the area.
Once the immediate danger has passed and the gas has been turned off, you will need a licensed emergency plumber with a gas fitting endorsement to inspect your system, identify the source of the leak, carry out repairs, and test the installation before gas is restored. Gas distributors will not restore supply until a licensed gasfitter has certified the installation is safe.
If you are searching for help, our guide to the best emergency plumbers in Sydney lists vetted practitioners who hold the appropriate licences. For a broader picture of what to expect to pay, the cost guide covers typical fee structures across Australia's capital cities.
Licensing requirements for gas fitters in Australia
Plumbing and gas fitting are regulated at the state and territory level, meaning licence requirements differ slightly depending on where you live. In every jurisdiction, however, a tradesperson must hold a specific gas fitting licence or endorsement in addition to any general plumbing licence before they are legally permitted to work on your gas installation.
- New South Wales: Licensed under NSW Fair Trading. Check a licence at NSW Fair Trading. - Victoria: Licensed and regulated by the Victorian Building Authority. Verify credentials at VBA. - Queensland: Licensed through the Queensland Building and Construction Commission at QBCC. - Other states and territories: Each has its own licensing body. Always ask to see a licence number and verify it online before work begins.
Always verify your tradesperson's licence before allowing them to work on your gas system. The ACCC consumer guarantees framework also entitles you to services that are carried out with due care and skill.
How to check your gas appliances and fittings regularly
Prevention is far more practical than dealing with an emergency. A few habits can significantly reduce your household's risk:
- Annual servicing: Have your gas heaters, cooktops, hot water systems, and other appliances serviced by a licensed gasfitter each year. Flexible gas hoses behind cooktops and ovens degrade over time and are a known failure point. - Flexible hose inspection: Look for any signs of cracking, corrosion, or kinking on visible hose connections. If a hose appears more than a decade old, ask a gasfitter to assess it. - Meter area: Keep the area around your gas meter clear of vegetation, stored items, and anything that could obstruct access or cause physical damage. - Carbon monoxide alarm: Install a carbon monoxide detector in rooms where gas appliances are used. These are available from hardware retailers and provide an additional layer of protection against incomplete combustion. - Know your isolation valve: Make sure every adult in the household knows where the gas meter is and how to turn off the supply in an emergency.
For information on minimum installation standards, the Australian Building Codes Board publishes the National Construction Code, which sets baseline requirements for gas installations in new and significantly renovated buildings.
Your rights as a consumer after a gas leak repair
Once repairs are complete, you are entitled to documentation of the work performed. A licensed gasfitter is required to issue a compliance certificate (sometimes called a certificate of compliance or a gas compliance certificate, depending on your state) confirming the installation meets the relevant standards. Keep this document with your property records.
If you believe work was performed poorly or without appropriate licensing, you have avenues for complaint. In New South Wales, contact NSW Fair Trading. In Victoria, contact the VBA. In Queensland, the QBCC handles complaints. Under the ACCC consumer guarantees, you may also have rights to have defective work remedied at no additional cost.
For guidance on evaluating tradesperson quality and our review methodology, see how we assess and list emergency plumbers.
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Frequently asked questions
Q: Can I stay in my home if I smell a faint gas odour but cannot locate the source? A: No. Even a faint smell of gas warrants immediate evacuation. Natural gas can accumulate quickly in enclosed spaces, and the concentration required to become flammable can be reached faster than you might expect. Leave, ventilate where possible, and call your gas distributor's emergency line. Q: How long will I have to wait before gas is restored after a leak? A: This depends on the extent of the damage and the availability of a licensed gasfitter. Once repairs are completed and a compliance certificate is issued, your distributor can restore supply. Waiting times vary by location and how quickly a licensed tradesperson can attend. An emergency plumber who offers after-hours service can often expedite the process. Q: Is a gas leak covered by home insurance? A: Coverage depends on your specific policy and insurer. Many home and contents policies include some provision for emergency repairs caused by sudden damage, but exclusions apply. Contact your insurer directly as soon as it is safe to do so, and keep all invoices and compliance documentation from your gasfitter. Q: Who pays for repairs to the gas supply line if the leak is outside my property boundary? A: The gas distribution network on the street side of the meter is typically the responsibility of your gas distributor, not you. The installation on your side of the meter -- including internal pipes and appliances -- is the homeowner's responsibility. Your distributor can clarify the boundary when they attend the emergency.---
Sources
- Energy Safe Victoria -- gas safety information - Victorian Building Authority (VBA) -- gasfitting licences - NSW Fair Trading -- plumbing and gas fitting licensing - QBCC -- Queensland gas fitting licensing - Australian Building Codes Board -- National Construction Code - ACCC -- consumer guarantees for services
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Information in this article is general only and not technical advice. Verify the details with the linked sources or an appropriately qualified Australian professional before relying on them.
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