How we fix it
About this service in Sydney
Of all the emergency calls a Sydney plumbing company gets, gas leaks sit at the top of the urgency list. The maths is simple: water damage is expensive but recoverable. A gas leak that finds an ignition source is catastrophic. Treat every gas smell as serious until a licensed gasfitter has confirmed otherwise.
The good news is that most domestic gas leaks across Sydney are at fittings, regulators, or appliance connections — small, localised, and fixable inside an hour once the supply is safe and the source is identified. The hard part is the first 10 minutes, before anyone with the right tools has arrived.
What to do in the first 10 minutes
If you’ve just noticed the smell, work through this sequence in order. Our detailed gas leak emergency guide has the full six-step response — read it now so you’re prepared.
Don’t operate any electrical switches. This includes light switches, ceiling fans, exhaust fans, electric ovens, the doorbell, and your mobile phone (if you can avoid it). Switches generate small sparks that can ignite gas-air mixtures at the right concentration.
Open doors and windows. Cross-ventilation reduces the gas concentration below the lower flammability limit (around 5% for natural gas). Get every external door open if you can do it without operating a powered door.
Get everyone outside. Children, pets, anyone unwell. To the front yard or footpath, well clear of the building. Neighbours too if the smell extends to shared walls or boundaries.
Ring 131 909 from outside. That is the Jemena Gas Networks emergency line for Sydney. They dispatch a network emergency crew who can isolate supply at the street if needed. This is free; it’s their service obligation as the gas distributor.
If anyone feels unwell, ring 000. Headache, dizziness, nausea, shortness of breath — possible signs of gas exposure. Don’t assume it’ll pass.
Then ring us. Once the area is safe and the network has done their part, you still need a licensed gasfitter to find the source, make the repair, pressure-test, and issue the compliance certificate. That’s where we come in.
Why gasfitting is its own licence in NSW
Under the Gas and Electricity (Consumer Safety) Act 2017, gasfitting work in NSW requires a separate licence to general plumbing. The logic is straightforward: water leaks cause damage; gas leaks cause explosions and asphyxiation. The regulatory framework reflects the risk.
Practical implications for you as a homeowner:
- A plumber without a current gasfitter’s licence cannot legally touch any gas pipework or fittings, even if they’re qualified to work on the water side of the same hot water unit
- Insurance claims involving gas work require evidence the work was completed by a licensed gasfitter — usually via a Certificate of Compliance
- Manufacturer warranties on gas appliances are voided by unlicensed work
- Selling your home: building inspections by buyers often check for compliance certificates on recent gas work
Our gasfitters hold both plumbing and gasfitting licences, which means a single tradesperson can complete both sides of work involving water and gas (hot water unit replacement, for example) without needing to coordinate two separate trades.
Common Sydney gas leak scenarios
A few patterns we see repeatedly across the metro area.
Corroded outdoor fittings — Eastern Suburbs and Northern Beaches, salt-air zones. Gas regulators, BBQ line connections, and exposed metering fittings corrode within 8-15 years even when properly installed. Symptom: faint outdoor gas smell near the meter or external regulator. Fix: replace the affected fittings with marine- grade equivalents.
Aged regulators on heritage homes — Inner West, Eastern Suburbs heritage zones. Gas regulators in homes that haven’t been renovated since the 1970s often pre-date current safety standards. They fail gradually, with intermittent low-pressure issues at appliances preceding actual leakage. Symptom: appliances starving for gas, pilot lights dropping. Fix: regulator replacement, often combined with a full system pressure test.
Buried line damage from landscaping — across all suburbs. Excavation work for new pools, retaining walls, garden beds, or irrigation often catches the buried gas supply line between the meter and the house. Symptom: gas smell developing days after landscaping work, often near the building. Fix: excavate, replace the damaged section, pressure-test.
Failed appliance connections — across all suburbs. Cooktop flexible gas connectors degrade over 10-15 years (particularly the cheap rubber ones used in 1990s installs). Hot water unit gas valves and pilot assemblies fail with age. Symptoms: smell near the appliance, intermittent failure to ignite. Fix: replace the specific component to manufacturer spec.
Ground subsidence — Western Sydney and parts of the Hills District where reactive clay soils have shifted underground gas lines. Less common than water-line damage from the same cause but more dangerous when it occurs. Symptom: gas smell outdoors with no obvious source above ground. Fix: locate via line tracer, excavate, replace, re-bury to current standard.
Our diagnostic process
Every gas leak call follows the same sequence on arrival:
- Confirm the leak with a calibrated electronic gas detector. We carry combustible gas analysers that detect concentrations from 100 ppm. Localises the source to within centimetres.
- Isolate the supply at the closest valve — usually the appliance isolation valve or the meter shut-off. Stops the leak while we diagnose.
- Pressure-test the whole system to AS/NZS 5601 standard. Reveals any secondary leaks beyond the obvious one.
- Quote the repair in writing with parts and labour breakdown. Even at 3am. You approve before any work starts.
- Complete the repair using certified materials and joint compound. Torque-tested to manufacturer specification.
- Re-pressure-test the affected section. Hold pressure for at least 5 minutes; verify with electronic detector at every fitting.
- Issue the Certificate of Compliance documenting the work, materials used, and test results. Hand over before turning supply back on.
- Re-light pilot lights on connected appliances; verify each appliance is operating normally before we leave.
Working with Jemena Gas Networks
Jemena owns and operates the natural gas distribution network across most of Sydney. Practical implications when an emergency happens:
- The supply line before your meter is Jemena’s responsibility
- The supply line after your meter is your responsibility
- Their emergency response is free and obligatory
- They will not perform any work after the meter — that’s licensed gasfitter territory
In about 15% of emergency gas calls we attend, the leak turns out to be on the network side (street main, supply-line corrosion, regulator on the meter itself). When that happens, we coordinate the handover — Jemena’s crew handles the network repair, we handle any consequent work on your side of the meter, and the compliance documentation is combined.
Annual gas safety inspections
Worth flagging because most Sydney homeowners don’t realise it’s recommended: an annual gas safety inspection by a licensed gasfitter is the single best preventative measure against emergency calls.
Costs about $180-280 for a full inspection covering:
- Meter and regulator condition
- Visible pipework integrity (above-ground sections)
- Appliance connections and isolation valves
- Combustion analysis on hot water units and gas heaters
- Pressure-hold test on the whole system
Most failed regulators and corroded fittings we end up replacing on emergency calls were already showing signs of impending failure 12-18 months earlier. Annual inspection catches them before the smell-of-gas moment.
Strata buildings in Sydney are increasingly mandating annual gas inspections through their bylaws — particularly newer high-rises in Pyrmont, Surry Hills, and Bondi Junction. Worth checking your strata schedule if you’re in an apartment.
To understand licensing requirements before you call, read our guide on how to verify a NSW plumber’s licence. For cost estimates, see our emergency plumber pricing guide.