Gas leak repair and gas lines in San Rafael and Marin County
We find and repair gas leaks, replace failing valves and fittings, and run new gas lines for generators, fire pits and barbecues across Marin County and southern Sonoma County. Every line we work on gets pressure tested before we leave. Every job is flat rate and quoted before we start, and the diagnostic visit is $69. California C36 license #1090862.
- Plumbing in Marin County since 2017
- California C36 plumbing license #1090862
- 5.0 stars from 89 reviews, as of October 2026
What's included
Included in every gas repair
- Locating the leak, not just guessing at it
- Repair or replacement of the failing fitting, valve or connector
- A shutoff valve at the appliance where one is missing
- A pressure test of the line before we turn anything back on
- A clear explanation of what failed and why
Priced separately
- New gas lines for generators, fire pits, barbecues or appliances, quoted by length and route
- Permits where the city requires them
- Water heater gas control valves, see water heater services
- Larger sections of corroded gas pipe, quoted and approved before we start
Price guide
| Job | Price |
|---|---|
| Diagnostic visit, inspection and quote | $69 |
| After hours and holidays, for real emergencies | Quoted when you call |
| Leak repair at a fitting, valve or connector | Flat rate, quoted on site |
| New appliance shutoff valve and flex connector | Flat rate, quoted on site |
| New gas line for a generator, fire pit or barbecue | Quoted by length and route |
What moves the price: how far the line has to run from the meter, whether it goes underground or along the house, and how many fixtures it feeds. Every price is flat rate, so the number we quote is the number you pay.
How it works
-
Smell gas? Get out first
Leave the house, don't flip switches, and call PG&E or 911 from outside. Once it's safe, call us.
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We come out
A suspected leak gets a response any time. A new gas line gets scheduled like any other job.
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We find it and fix it
We locate the leak, repair or replace what failed, and add a shutoff where one is missing.
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We pressure test
The line gets tested before anything is turned back on, and we walk you through what we did.
What our job records show
16
Gas line jobs since November 2025, not counting water heaters.
Those include leak repairs, valve replacements and brand new lines. In Santa Rosa this September we ran a new 30 foot galvanized gas line with a shutoff valve from the meter to a generator on the deck, then pressure tested it before it went into service.
Aging fittings, corroded connections and shifting soil all wear on gas piping over time. Most leaks we find are at a fitting or a connector, not in the middle of a pipe.
Who does the work
Glenn Lopes
Owner and C36 license holder. Started Big Island Plumbing in 2017 after five years as a carpenter and a six month UPC code course. Every gas line gets a pressure test before we leave. No exceptions.
Recent gas line reviews
Read all our reviews on GoogleWhere we repair gas leaks and run gas lines
Mill Valley
Santa Rosa
Larkspur
Fairfax
San Anselmo
Corte Madera
Woodacre
San Geronimo
Ross
Tiburon
Sausalito
We also do gas work in Greenbrae, Kentfield and the rest of Marin and southern Sonoma County. See all service areas
Questions we get asked
What should I do if I smell gas?
Get everyone out of the house. Don't turn lights or appliances on or off, and don't use your phone until you're outside. Call PG&E or 911 from outside, then call us once they've made it safe.
How much does gas leak repair cost?
It's flat rate. We charge $69 to come out and find the problem, then give you one price for the repair before we start. A leak at a fitting costs a lot less than replacing a run of corroded pipe.
Can you run a gas line for a generator, fire pit or barbecue?
Yes. We run dedicated lines from the meter with their own shutoff, routed and supported along the house or underground, and pressure test them before they go into service.
How do you know the repair worked?
We pressure test the line after every repair or new install. If it doesn't hold, it doesn't get turned back on.
Are you licensed?
Yes. Big Island Plumbing holds California C36 plumbing contractor license #1090862. You can verify it on the Contractors State License Board site.
Related services
Need gas work done? Call (415) 209-8142
If you smell gas right now, get outside and call PG&E or 911 first.