If you smell gas, leave first and call from outside.
Southwest Gas emergency is (877) 860-6020. Everything else on this page can wait until you’re standing in the driveway, which is the correct place to read it from.
If you smell gas, leave the building first and call Southwest Gas emergency at (877) 860-6020 from outside: don’t touch light switches, appliances, or garage doors on your way out. New gas line work in the East Valley runs $800 to $3,500 depending on scope, must be done by a licensed contractor, and is pressure-tested and inspected under the Fuel Gas Code.
The safety part, said once and clearly
Natural gas is odorized specifically so you can detect a leak. If you smell it: get everyone out, don’t switch anything on or off including lights and garage door openers, don’t use a phone inside the building, and call Southwest Gas emergency at (877) 860-6020 once you’re outside and away. That number is worth putting in your phone before you need it. Southwest Gas responds to suspected leaks regardless of whether the problem turns out to be on their side or yours, and they don’t charge to come check.
Sizing is the whole engineering problem
The common assumption is that a gas line is priced by its length. Length matters, but diameter matters more, and diameter is determined by the total BTU demand of everything on the run plus the developed length back to the meter. Add a tankless water heater to a system already carrying a furnace, a range, a dryer, and a pool heater, and the existing pipe may be adequate for the old load and inadequate for the new one, which is why a tankless conversion so often carries a gas line upsize. We run the sizing calculation rather than estimating it, and anyone who can’t tell you the BTU total for your appliances hasn’t done it.
What the code requires
Every East Valley city builds to the International Fuel Gas Code, gas work is permitted and inspected everywhere, and we pressure-test a new line and hold it before it goes into service. The test is the point, not a formality. Arizona also requires an ROC-licensed contractor for this work, and the ROC’s recovery fund doesn’t cover work performed by unlicensed individuals. On gas, that’s not a paperwork detail.
The common jobs, and what moves the price
A short stub for a BBQ off an existing accessible line is the cheap end. Running a new line to a range where none existed, or to a fire pit across a yard, is trenching plus pipe plus a sleeve where it passes under hardscape. A pool heater or a tankless unit is the expensive end, because both draw heavily and frequently need larger pipe back toward the meter, and occasionally a conversation with Southwest Gas about meter capacity. What moves the number is diameter, developed length, how much of the run is buried, and whether anything has to be cut or bored through. Ask for the sizing calculation and the test results in writing. Both should exist.
Where this page cites a utility, permit or housing figure for a specific town, it’s that town’s published data. Your own city’s water report applies to your tap and your city’s building department sets your permit rules; ask us which apply to your address.
When to stop and call rather than investigate
Leave the building, touch no switches, and call Southwest Gas at (877) 860-6020 from outside. This isn’t a wait-and-see.
Audible escaping gas means a significant leak. Same procedure: out first, call from outside.
Sometimes a thermocouple, sometimes a gas supply or pressure problem. Worth diagnosing rather than relighting repeatedly.
An underground leak displaces oxygen at the roots. A patch of dead grass over a known gas run is a genuine signal.
Multiple gas appliances running weakly at once can indicate undersized supply or a pressure problem rather than four failing appliances.
A pool heater or tankless unit changes the whole system's load. Get the sizing done before buying the appliance.
What gas line work runs in the East Valley
Scope drives everything. Connecting an appliance to an adequate existing line is a short job. Adding a high-demand appliance that forces a larger run back toward the meter is a different order of work, and it’s all permitted and inspected.
Planning range, flagged honestly: the published Phoenix-metro sources checked on 2026-08-21 (plumbingpriceguide.com/phoenix-plumbing-cost, phoenixplumbingauthority.com, desertrainplumbing.com, plumbingphoenixpros.com) didn’t carry a specific local figure for this job, so this range is built from local labor rates plus the components involved. Individual Phoenix pages publish gas figures at very different scopes. One gives $200–$1,500 overall with a new appliance connection at $200–$500 and leak detection and repair adding $300–$800. Another gives $500–$1,500 for a longer new run and $1,500–$2,700-plus for difficult pool heater or tankless work. Once permitted, inspected, licensed work and a real minimum visit charge are included, the local planning band lands at $800–$3,500. Treat it as a sanity check rather than a benchmark, and not as a quote.
The diagnostic fee comes off the repair. We charge a service call to come out and diagnose the problem. If you approve the work, that fee is credited against it in full. You hear the fee on the phone before anyone drives, and it’s the same number at every location.
How we do a gas job properly
We calculate the load before we pick the pipe
Total BTU demand of every appliance on the run, plus the developed length back to the meter, sets the diameter. That’s arithmetic, not judgment.
We call Blue Stake before we dig
We call Arizona 811 before we trench an exterior run. Buried utilities share that yard, and the whole point isn’t to find them the hard way.
We run the pipe with a shutoff and a drip leg
Every appliance gets its own accessible shutoff. A drip leg at the appliance catches debris and condensate before it reaches the burner.
We pressure-test it, then present it for inspection
We pressurize the new line and hold it to confirm it doesn’t lose pressure, then present the work for inspection. Ask us for both results.
Gas work around the East Valley
Outdoor kitchens, fire pits, and pool heaters drive most of this work, which follows backyard projects rather than build era. Tankless conversions add the other half.
Answers, not a brochure.
What do I do if I smell gas in my home?
Leave the building immediately with everyone in it. Don’t operate any electrical switch on your way out (that includes light switches, appliances, and the garage door opener) and don’t use a phone inside. Once you’re outside and clear of the building, call Southwest Gas emergency at (877) 860-6020. They respond to suspected leaks whether the problem is on their equipment or yours, and there’s no charge to have them come check.
Do I need a permit for a gas line?
Yes. New gas line work is permitted and inspected in every East Valley city, and there is no exemption for it anywhere that we know of. We pull the permit, the fee goes on the written quote, and the pressure test and inspection result are yours to keep.
Can I install a gas line myself?
No, and this is the clearest case on the site. Arizona requires a licensed contractor for gas work, the installation is pressure-tested and inspected, and the Arizona ROC's consumer recovery fund doesn’t cover work performed by unlicensed individuals. Beyond the legal position, the sizing calculation and the pressure test are what make the installation safe, and neither is something to approximate. Gas is the one to leave alone.
Why does adding a tankless water heater need a bigger gas line?
Because a tankless unit produces hot water on demand rather than storing it, its instantaneous gas demand is typically two to four times that of the tank it replaced. Pipe diameter is determined by total BTU load across everything on the run plus the developed length back to the meter, so a line that was correctly sized for a furnace, range, dryer, and tank heater may be undersized once a tankless unit joins them. Get the sizing calculation done before you buy the appliance.
How much does it cost to run a gas line to a BBQ or fire pit?
A short stub off an accessible existing line that already has capacity is the cheap end, roughly $800 to $1,200. A buried run across a yard to a fire pit or outdoor kitchen is more involved (trenching, pipe, a sleeve where it crosses hardscape, and a shutoff at the appliance) and lands closer to $1,500 to $3,500 in the Phoenix metro. Length matters, but what’s on the surface it has to cross usually matters more.
How do I know the new line was tested?
Ask for the pressure test result and the inspection outcome, and ask before the job starts so it’s expected rather than awkward. We pressurize a new gas line and hold it to confirm it doesn’t lose pressure, and your city inspects the work. A contractor who treats that request as unusual is telling you something. Keep the paperwork with your home records. It matters at resale.
Often the same visit.
If you smell gas, don't use the form. Get outside and call Southwest Gas at 877-860-6020.