The Sydney Homeowner's Guide to Gas Leak Detection

How to detect gas leaks, what causes them, how dangerous they are, what repairs involve - and the urgent steps you must take to stay safe. A gas leak is one of the most serious plumbing emergencies you can face. Gas is highly flammable, fast-moving and potentially life-threatening if not handled immediately. Whether you live in a terrace in the Inner West, an apartment in the Eastern Suburbs, a home in the Northern Beaches, or a property in Western Sydney, gas leaks can occur unexpectedly - and you must act fast. Jayco Plumbing provides 24/7 gas leak detection and repairs across Greater Sydney. With more than 20 years’ experience, we’ve seen every type of gas fault imaginable - from appliance leaks to full underground line failures. If you suspect a leak, this guide will help you understand the risks and the right steps to take.

A gas leak occurs when natural gas or LPG escapes from your:

• Gas lines
• Appliance connections
• Fittings
• Regulators
• Heaters
• Hot water systems
• Cooktops
• Ovens
• Outdoor BBQ points
• Underground pipes

Natural gas is intentionally scented with mercaptan, a chemical that smells like rotten eggs - this is your main warning sign. Even a small leak can spread quickly and become dangerous.

Gas leaks can cause:

Fire or Explosion

Gas is extremely flammable. A spark can ignite it.

Carbon Monoxide Poisoning

Faulty appliances can release deadly CO gas - invisible and odourless.

Breathing Issues or Headaches

Early signs of indoor exposure.

Increased Gas Bills

A hidden leak wastes gas continuously.

Appliance Failure

Incorrect pressure affects performance. Gas leaks must be treated with urgency - every second matters.

Ageing Gas Lines

Older suburbs like Balmain, Leichhardt, Randwick, Mosman and Kogarah have gas lines that are decades old.

Poor or Illegal Installations

Unlicensed or DIY gas work is a major hazard. Wrong fittings, loose joints or incorrect pressure can create leaks.

Flexible Hose Failure

Common behind:

• Ovens
• Cooktops
• Heaters

Flexible hoses are one of Sydney’s most common gas leak sources.

Damaged Regulators

Faulty gas regulators can leak or fail to provide stable pressure.

Appliance Faults

Gas heaters, hot water systems and cooktops wear out over time.

Underground Gas Line Damage

Tree roots, soil movement or construction can impact pipes.

Incorrect LPG-to-Natural Gas Conversion

Wrong injectors = dangerous combustion. Sydney properties - especially older ones - are at high risk of gas faults.

Take these seriously.

Rotten Egg Smell

The strongest warning sign.

Hissing Sound Near a Pipe or Appliance

Gas escaping under pressure.

Dizziness, Headaches or Nausea

Potential CO exposure.

Weak Flame or Yellow Flame

Faulty combustion in cooktops and heaters.

Gas Bills Suddenly Increasing

Hidden leak in the system.

Dead Plants Near Gas Lines

Underground leak affecting soil.

Bubbles When Testing with Soapy Water

Indicates a leak in the tested area. If you notice ANY of these, act immediately.

Turn Off the Gas at the Meter

Usually located outside near the front boundary.

Open All Windows and Doors

Ventilate the area.

Do Not Use Any Electrical Switches

No lights. No appliances. No powerpoints.

Do Not Use Flames

No stoves. No lighters. No candles.

Evacuate If the Smell Is Strong

Call Jayco Plumbing Immediately

We send a licensed gas fitter to your location fast.

Jayco Plumbing uses professional-grade tools designed for precise diagnosis.

STEP 1 - System Isolation We isolate sections of the gas line to narrow down the leak location.

STEP 2 - Electronic Gas Detection We use:

• Gas sniffers
• Combustible gas detectors
• Pressure gauges

These detect even the smallest leak.

STEP 3 - Pressure Testing Confirms whether the system holds gas under normal operating pressure.

STEP 4 - Pinpoint Location We identify the exact point of failure - above ground, behind walls or underground.

STEP 5 - Repair We:

• Replace damaged pipe
• Tighten joints
• Replace fittings
• Install new regulators
• Repair appliance connections

STEP 6 - Final Safety Check & Certification Required by NSW law for any gas repair. No guesswork. No shortcuts. Just proper, licensed gas fitting.

Flexible Hose Replacement

These degrade and crack over time. Must be replaced every few years.

Appliance Connection Tightening or Replacement

Cooktops and heaters often loosen over time.

Regulator Replacement

Faulty regulators disrupt pressure and leak.

Pipe Joint Repair

Worn or corroded joints are common leak points.

Gas Line Replacement

For old or damaged lines.

Underground Gas Leak Repairs

May involve:

• Pipe tracing
• Excavation
• Section replacement

Incorrect LPG/NG Conversion Correction

Wrong jetting causes dangerous combustion. Every repair includes a Gas Compliance Certificate.

Costs vary depending on:

• Leak location
• Access difficulty
• Age of system
• Whether parts need replacement
• Type of appliance involved

Typical Sydney prices:

• Minor leak repair: $180–$350
• Hose replacement: $120–$280
• Regulator replacement: $180–$350
• Underground leak repair: $350–$1,200+
• Appliance service: $120–$240
• Full pressure testing: $150–$350

You’ll always receive upfront pricing before work begins.

Inner West (Leichhardt, Marrickville, Annandale)

Older homes with ageing pipework.

Eastern Suburbs (Bondi, Randwick, Coogee)

High salt exposure accelerates corrosion.

Northern Beaches (Manly, Balgowlah, Dee Why)

Salt and moisture increase pipe wear.

North Shore (Chatswood, Turramurra, Wahroonga)

Tree roots and older infrastructure.

Western Sydney (Parramatta, Blacktown, Penrith)

Ground movement + older systems.

Hills District (Castle Hill, Kellyville)

Fast-growing areas with mixed-quality installations.

St George (Hurstville, Kogarah)

Common flexible hose failures.

Sutherland Shire (Cronulla, Miranda)

Salt + soil movement + ageing metal pipes.

South West Sydney (Liverpool, Campbelltown)

Many older gas systems and cheaper DIY installations.

Canterbury–Bankstown (Bankstown, Greenacre)

Outdated regulators + older gas appliances. Gas leaks are not suburb-specific - they’re a risk everywhere.

Replace Flexible Hoses Every 5 Years

These fail more than any other gas component.

Annual Gas Safety Inspection

A small check prevents major risks.

Install Appliances Correctly

Use licensed gas fitters - not handymen.

Keep Outdoor Gas Systems Protected

Weather, insects and corrosion increase failure.

Correct LPG/NG Conversion

Never assume an appliance is correctly jetted.

Don’t Ignore Weak or Yellow Flames

This is your early warning sign.

Avoid DIY Gas Work

It’s illegal and extremely dangerous. Good maintenance = safe home.

Call immediately if:

• You smell gas
• You hear hissing
• Appliances burn yellow/orange
• You feel dizzy indoors
• Your gas bills have spiked
• Plants near gas lines are dying
• Pilot lights keep going out
• You suspect underground leaks

Gas leaks are not “wait until morning” issues.

• Licensed gas fitters with 20+ years’ experience
• Advanced leak detection equipment
• 24/7 emergency response
• Upfront pricing
• Natural gas & LPG specialists
• Certified, insured and compliant
• Thousands of gas repairs across Greater Sydney
• Fast dispatch + clean workmanship
• We fix the cause, not just the leak

Gas work is not something you leave to chance - you leave it to real experts.