Gas Line Repair: What Every Homeowner Needs to Know
If you smell gas right now, stop reading. Get everyone out of the building. Do not switch lights on or off, use a landline phone, start a car, or do anything else that could create a spark. From outside, call Puget Sound Energy at 1-888-225-5773 or 911. Do not go back in until the utility or fire service says it is safe.
Most gas line problems do not start as emergencies. They start as a slightly weak burner flame, a gas bill that crept up, or a patch of dead grass over a buried line. Caught then, a repair is straightforward. Left alone, it becomes the situation described above.
By Ramin Shahbaziasl, Owner, Eastside Repipe & Plumbing · Last updated October 02, 2025
This guide covers the signs worth acting on, what repair actually involves, what drives the cost, and where the line sits between something to schedule and something to evacuate for.
What to Do If You Suspect a Leak
Worth reading before you need it.
Signs of an active leak:
The rotten egg odor utilities add to natural gas
Hissing or whistling near a line, meter, or appliance
Dead or dying vegetation in a patch over a buried line
Dirt or bubbles blowing up from the ground
Headache, dizziness, or nausea that eases when you leave the building
The sequence:
Leave. Everyone, including pets
Create no ignition source. No light switches, no phones indoors, no appliances, no vehicle ignition, no garage door opener
Call from outside. PSE at 1-888-225-5773 or 911
Stay out until it has been cleared
The utility comes before the contractor. PSE responds to gas emergencies and will shut the service down if needed. Once the situation is safe, a licensed contractor handles the repair.
On detectors: carbon monoxide detectors will not alert you to a natural gas leak. CO comes from incomplete combustion; a gas leak is unburned gas escaping. Both hazards produce headaches and nausea, which is exactly why people confuse them. Have a CO detector and a natural gas detector.
Signs You Need Repair, Not Evacuation
These warrant a scheduled call rather than an emergency one:
Visible corrosion or rust on exposed pipe or fittings
A gas bill that climbed with no change in usage
Yellow or orange burner flames instead of blue, which can indicate incomplete combustion
Soot marks around an appliance
Appliances that underperform, particularly when several run at once, which often means the line is undersized rather than damaged
A pilot light that will not stay lit
None of these are emergencies on their own. All of them are worth investigating, because the failure mode at the end of the road is the one at the top of this page.
What Repair Involves
Inspection. The system is assessed for corrosion, damage, pressure issues, and adequacy for the connected load. Underperforming appliances are frequently a sizing problem rather than a leak.
Locating the fault. Pressure testing and detection equipment isolate where the loss is occurring. This is not smell-based; it is instrumented.
Isolation. The line is shut down before anything is opened.
Repair or replacement. A damaged section may be replaced, or a run may be replaced entirely. Material is governed by code rather than preference: the Washington State Fuel Gas Code, which adopts the International Fuel Gas Code with state amendments under WAC 51-52, sets what is permitted, plus local amendments on top. Black steel and CSST cover most residential applications.
Pressure testing. The system is pressurised and held to confirm integrity before gas is reintroduced.
Inspection sign-off. Permitted work is inspected by the jurisdiction before the system goes back into service.
Why This Is Not a DIY Job
Gas piping is permitted work in Washington and must be performed by certified tradespeople employed by a licensed contractor. Beyond the legal position, the practical one: the failure modes are fire, explosion, and carbon monoxide, and none of them announce themselves before they happen.
Verify any contractor's license, bond, and insurance for free through the state Department of Labor and Industries before you book.
What Drives the Cost
Rather than quote ranges that vary wildly by situation, here is what actually moves a quote:
Extent of the problem. A single fitting is a different job from a corroded run
Location. Exposed interior pipe is straightforward. Buried, in a wall, or under a slab is not
Access. What has to be opened, and put back
Material and length required
Permit and inspection, which are part of the job rather than optional extras
Whether the line needs upsizing rather than just repairing, which is common when appliances have been added over the years
Ask for a written quote that separates labour, materials, permit, and testing. A quote noticeably below the others usually excludes the permit or the pressure test. Our plumber cost guide covers typical local rates across services.
Preventing the Next One
Annual inspection, and any time you add or replace a gas appliance. New appliances frequently exceed what an older line was sized to carry
Service your gas appliances. A poorly maintained appliance stresses the system and is the more common source of combustion problems. Our guide on water heater troubleshooting covers the signs on that side
Know where your gas shutoff is and keep a wrench near it
Note buried line locations before any digging or planting
Teach the household the protocol: smell gas, leave, call from outside
Test CO detectors monthly and replace on the manufacturer's schedule
PSE provides free safety checks on gas appliances, which is worth knowing if you have a non-urgent concern.
A whole home plumbing inspection covers gas appliance connections alongside the rest of the system.
Choosing Who Does the Work
Look for:
License, bond, and insurance you verify yourself
Permits pulled as part of the job
Pressure testing described without you having to ask
Itemized written quoting
A stated workmanship warranty
Availability that matches your situation
Walk away from:
Any suggestion a permit is unnecessary
A quote given without inspecting the system
No mention of testing
Pressure to decide immediately
Cash only, or a large up-front deposit
Our guide to choosing a gas piping contractor goes into the selection process in more detail.
Frequently Asked Questions
What should I do first if I smell gas?
Leave the building, create no ignition source, and call PSE at 1-888-225-5773 or 911 from outside. Do not try to find the leak yourself and do not go back in until it has been cleared.
Can I repair a gas line myself?
No. It is permitted work requiring certified tradespeople, prescribed materials, pressure testing, and inspection sign-off.
How often should gas lines be inspected?
Annually, and any time a gas appliance is added or replaced. More often for older homes with original piping.
How long does a repair take?
A straightforward section repair is often the same day. A longer run, buried line, or a job requiring upsizing takes longer, and permitted work has to wait for inspection before the system goes back into service.
Will a carbon monoxide detector warn me about a gas leak?
No. CO detectors sense carbon monoxide from incomplete combustion, not unburned natural gas. You need both types.
What if I cannot afford the repair right now?
If there is an active leak, this is not a decision you get to make — the utility will shut the service off, and that is the correct outcome. For non-urgent work such as corrosion found during an inspection, talk to us about timing and phasing. Do not defer anything involving a suspected leak.
Book a Gas Line Inspection
If you have noticed corrosion, an unexplained bill increase, yellow burner flames, or appliances that struggle when run together, an inspection is the sensible next step. We will assess the system, establish whether the issue is damage or sizing, and quote in writing, including permit and testing.
Book an inspection or call 425-331-2011. See our specialized plumbing services for the full scope of gas line work we handle.
We serve Bellevue, Kirkland, Redmond, Seattle, and the wider Eastside service area.
For an active gas leak, call PSE at 1-888-225-5773 or 911 first. Get it made safe before you call anyone else.
