Smell Gas? Do This Immediately.
- Leave the building now — do not use any electrical switches or open flames
- Call 911 and your gas company from outside — they shut off service at the meter
- Do not re-enter until the gas company clears the building
- Call a licensed plumber for the repair — after the gas company confirms it is safe
Gas Line Repair Costs in Seattle (2026)
| Service | Cost Range |
|---|---|
| Gas leak detection / inspection | $150–$425 |
| Gas line repair (minor) | $200–$550 |
| Gas line repair (major) | $700–$2800 |
| New gas line installation | $700–$2800 |
| Gas line relocation | $700–$2100 |
| Whole-house gas repiping | $4200–$11200 |
All gas line work in Washington requires a licensed plumber and a permit. Prices as of 2026 for Seattle.
License required: In Washington, all gas line work must be performed by a licensed plumber with gas certification. Verify any contractor at https://lni.wa.gov/licensing-permits/plumber/ before work begins. Never allow unlicensed gas work.
What to Expect During Gas Line Work in Seattle
1
Licensed plumber pulls a permit
Gas work in Seattle requires a permit from King County. The plumber pulls this — not you.
2
Pressure test before and after
The line is pressure-tested to confirm there are no leaks before gas service is restored.
3
Gas company reconnects service
After repair and inspection, your gas utility restores service — the plumber cannot do this step.
4
Inspection sign-off
A city inspector signs off on the permitted work before use. This protects you and satisfies your insurance.
Common Plumbing Issues in Seattle
Very soft acidic water corrodes copper pipes
Aging 1940s–1970s copper with pinhole leaks
Highest Pacific NW labor rates
Clay hills create complex sewer grades
Frequently Asked Questions
How much does gas line repair cost in Seattle?
Minor gas line repairs in Seattle run $200–$550. Major repairs and new line installation cost $700–$2800. Whole-house gas repiping ranges from $4200–$11200. All gas line work requires a licensed plumber and a permit in Washington.
Is a gas leak an emergency?
YES — immediately. Leave the building, do not operate any electrical switches or open flames, call 911 and your gas company first to shut off service, then call a licensed plumber. Do NOT attempt to find or fix the leak yourself. Do not re-enter until the gas company has cleared the building.
Can I repair a gas line myself in Seattle?
NO. Gas line work requires a licensed plumber and a permit in Washington. DIY gas line work is illegal and extremely dangerous — even a minor mistake can result in explosion, fire, or carbon monoxide poisoning. Always verify your plumber's license at https://lni.wa.gov/licensing-permits/plumber/ before gas work begins.
How do I find a licensed gas line plumber in Seattle?
Use RateYourPlumber.com to find licensed, reviewed plumbers in Seattle who handle gas line work. Verify any plumber's license at https://lni.wa.gov/licensing-permits/plumber/ — confirm the license specifically covers gas work. Get a written permit number before work starts.
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