Is that strange smell in your kitchen more than just last night’s leftovers?
You could be dealing with something far more serious—a gas leak.
Gas leaks aren’t just inconvenient—they’re dangerous. Whether it’s a faint whiff of rotten eggs or a sharp hissing sound behind the wall, these are signs you should never ignore. For homeowners juggling work, family life, and renovations, knowing the basics of gas leak repair could mean the difference between a quick fix and a costly emergency.
In this guide, we’ll walk you through how to spot a gas leak, what to do if it happens, and why hiring a licensed gas plumber is absolutely non-negotiable. We’ll also explore preventive tips and how to choose trustworthy professionals—because safety at home should never be left to chance.
Let’s get into it—because when it comes to natural gas safety, it pays to stay informed.
What Every Homeowner Should Know About Gas Leaks
Gas leaks don’t just happen in older homes. Even recently renovated properties in suburbs like Newtown or Randwick can face these risks—especially after a kitchen or bathroom overhaul.
Natural gas is a popular energy source in Australia. It’s efficient, affordable, and widely used for cooking, heating, and hot water. But a leak? That’s a ticking time bomb.
A gas leak occurs when gas escapes from pipelines, appliances, or fittings. Because natural gas is highly flammable, even a tiny leak can be dangerous if left unchecked. Luckily, gas suppliers add a strong, sulphur-like smell to help with gas leak detection. It smells like rotten eggs—and that’s your first red flag.
Why do leaks happen?
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Worn or corroded pipes
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Poor appliance installation
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Damage from home renovations
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Old or cracked seals and joints
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Faulty flexible gas hoses under stoves
Think about that time you drilled into a wall to hang shelves or moved a gas heater slightly—small moves like these can unknowingly damage gas lines. That’s why any sign of a leak, no matter how minor it seems, deserves serious attention.
What Is a Gas Leak?
A gas leak is the unintentional release of gas from a pipe, appliance, or connection. It might sound harmless, but when natural gas mixes with air, it creates a highly flammable environment.
Unlike carbon monoxide, natural gas isn’t poisonous—but it can displace oxygen in the air, making it difficult to breathe. It can also lead to explosions when exposed to a spark. And that’s where the real danger lies.
It’s worth noting that natural gas is odourless in its pure form. That’s why gas providers add mercaptan—a harmless chemical that smells like rotten eggs—to alert you to leaks. That scent is your best friend in keeping your home safe.
What Causes Gas Leaks in Australian Homes?
Gas leaks often catch homeowners off guard—but they rarely happen without a cause. In Australia, the most common triggers include:
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Aging infrastructure – Pipes and joints naturally deteriorate over time, especially in older homes.
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DIY renovations – Unlicensed work on kitchens or outdoor BBQ areas can lead to damaged lines.
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Faulty appliances – Ovens, heaters, and water systems can develop leaks if not properly maintained.
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Weather impact – Temperature shifts and soil movement can crack underground lines.
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Rodents – In rare cases, critters chew through flexible gas connectors under stoves or BBQs.
If your home is more than a decade old or you've done recent remodelling, it's smart to book a gas leak detection inspection, especially before winter kicks in.
How to Spot the Warning Signs of a Gas Leak
When it comes to gas leak signs, your senses are your biggest allies. Here's how to stay alert and stay safe.
Smell Something Funky? It Might Be Rotten Eggs
The smell of sulphur or rotten eggs is the first and most obvious giveaway. It’s caused by mercaptan, the safety chemical added to gas.
If you smell it near your stove, water heater, or gas meter—don’t ignore it. Even if it comes and goes, it’s still a potential leak.
Hearing a Hiss? That’s a Clue
Gas escaping under pressure often makes a soft hissing or whistling noise, especially from behind appliances or under floorboards. It may be subtle, but if you hear it near any gas outlet, turn off the gas at the meter immediately and get outside.
See Dust or Dead Patches? Don’t Dismiss It
Leaking underground gas can disturb the soil and kill nearby plants. If you notice unexpected dust clouds, dying lawn patches, or bubbling water in the garden—this could be gas seeping from an underground pipe.
Feeling Nauseous, Dizzy, or Headachy Indoors?
Low-level exposure to gas can affect your health. If multiple people in your household are suddenly dizzy, tired, or nauseous—especially in the same room—it’s a sign to evacuate and seek help.
What to Do Immediately If You Suspect a Leak
Evacuate Immediately, Don’t Risk It
The first thing? Get everyone—including pets—outside. Open doors and windows as you leave, but don’t linger inside. Gas builds up quickly, and inhaling it is unsafe.
Leave your car in the garage if it’s indoors. You can return later with help.
Avoid Using Anything That Creates a Spark
Don’t turn on lights. Don’t use the stove. Don’t even flick on your phone torch.
Anything that sparks—even static electricity—can ignite a gas-filled room. Wait until you’re outside to call for help.
Call the Pros: Emergency Services and Gas Provider
Once safe, call 000 and your gas provider's emergency number. For most Sydney homes, that’s Jemena Gas Network on 131 909.
Then, contact a licensed gas plumber to perform repairs. Only a certified technician can legally carry out gas leak repair work.
What Happens During Professional Gas Leak Repair?
Step 1: Pinpointing the Leak with Special Tools
A qualified plumber will begin with a gas leak detection test, using tools like electronic sniffers and pressure gauges. They’ll check pipes, appliances, and connections—especially in spots hidden behind cabinetry or walls.
They might apply a soapy solution to suspect areas—if it bubbles, there’s a leak.
Step 2: Replacing or Repairing the Fault
Depending on the severity, the plumber might tighten fittings, replace a section of pipe, or shut down faulty appliances. For underground leaks, they may dig up a portion of the yard to access damaged lines.
Only a licensed gas plumber can legally carry out this work.
Step 3: Safety Testing and Clearance
Before giving the all-clear, your plumber will retest everything. They’ll ensure pressure levels are stable and there are no lingering leaks.
In some cases, they’ll also issue a gas compliance certificate, which can be useful for insurance and peace of mind.
How to Prevent Gas Leaks in the Future
Book Regular Safety Checks
Get a professional inspection every 1–2 years—especially if your home is more than 10 years old or you use gas for cooking and hot water.
A licensed technician will test joints, regulators, hoses, and valves for early signs of trouble.
Install a Gas Detector for Peace of Mind
These devices work like smoke alarms, detecting gas in the air before you notice a smell. They’re inexpensive and can be installed in kitchens, laundry rooms, or near heaters.
Some even connect to your phone for real-time alerts—perfect for busy households.
Always Use a Licensed Gas Plumber
Whether you're installing a new oven or shifting a heater, never cut corners. Unlicensed work is illegal and voids insurance.
Perform A Search to verify credentials.
Choosing the Right Gas Leak Repair Professional
Check Their Licence First
In NSW, gas plumbers must hold a specific gasfitting licence. Don’t just ask—verify it online through Service NSW.
A professional will always be happy to show credentials and discuss previous jobs.
Read Real Reviews from Real Locals
Jump on Facebook groups, Google reviews, or Maintainmyhouse to find rated professionals in your area. Look for consistent feedback about reliability, punctuality, and fair pricing.
A five-star review from a family in Parramatta can be more reassuring than any sales pitch.
Get Multiple Quotes to Compare
Don’t just go with the first plumber you call. Get 2–3 quotes with written scopes of work. Ask whether pricing includes parts, labour, testing, and post-repair certification.
This helps avoid surprise costs—and gives you leverage to negotiate.
Final Thoughts: Don’t Wait, Act Early
Gas leaks are nothing to mess around with. They’re dangerous, silent, and easy to overlook—especially in a busy home.
Whether it’s that strange smell near your cooktop or an odd hissing behind the wall, it’s better to be safe than sorry. Knowing the signs, taking quick action, and relying on licensed gas plumbers ensures your family stays protected.
From quick gas leak detection to full gas leak repair, trust the professionals. Your safety—and your home—are worth it.