The gas company owns the pipe up to and through the meter. Everything past it is yours. That's where the plumber's work starts.
The main pipe runs from the meter and feeds every branch. Its size is based on how much total gas your appliances need when running together.
Each appliance gets its own branch off the main. Bigger appliances need bigger branches. A tankless water heater needs a much bigger branch than a range or a dryer.
A short pipe stub with a cap that sits just before each appliance. It catches dirt, scale, and water in the gas line before they hit the appliance. Code requires one at every appliance. Cheap to add. Often skipped.
A shutoff valve at the appliance, then a flexible connector for the last hookup. The flex line is only for the last few feet — never as a main run. The shutoff lets you turn off gas to one appliance without killing it to the whole house.
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Real recent jobs from Mountain Man Plumbing across the Wasatch Front.
One of the questions I get from homeowners is: was that gas line quote fair?
Sometimes yes. Sometimes no. This site helps you ask better questions before you approve the work.
Read my storyStraight answers before you book.
Gas line work runs from a few hundred dollars for a simple appliance hookup on an existing line, up to several thousand for a whole-house gas re-pipe in an older home. The honest answer is "it depends on the job" — line size, run length, code upgrades, and how much old pipe gets touched all change the number. Drop your quote into the Second Opinion tool above for a fair-or-not check against real Utah numbers for your scope.
Both work. Black iron is the traditional steel pipe — strong and proven, but slow to cut and thread by hand. CSST (flexible stainless pipe — brand names Gastite, TracPipe) installs much faster, so most modern jobs use it. CSST is usually cheaper on the install bill not because the material is cheaper but because the labor is. One thing worth knowing: older yellow CSST has to be bonded to your home's electrical ground for lightning safety. Newer black-coated CSST (FlashShield, CounterStrike) is built with that protection in the jacket and doesn't need extra bonding.
Gas demand. A tank water heater burns about 40,000 BTU. A tankless burns 150,000 to 200,000 BTU because it heats water on demand instead of storing it. That's four to five times more gas flowing per minute. The skinny line that fed your old tank can't move that much gas. The fix is usually upsizing from 1/2 inch to 3/4 inch. A plumber who skips this is setting up an appliance that won't run right.
It's a short piece of pipe with a cap, installed right before each gas appliance. It catches dirt, scale, and water that travel through the line before they hit the appliance valve. Code requires one at every gas appliance. Costs a few dollars. A plumber who skips it is saving five minutes and selling you out on code.
Before any new gas line gets closed up behind drywall, the plumber pumps it up to a higher pressure than normal gas pressure and watches it for a set time. If the pressure drops, there's a leak somewhere and they find it before the wall closes. A line that fails the test gets fixed. One that doesn't get tested gets buried with whatever leaks are in it.
In most Utah cities, no. Gas work needs a permit, and only a licensed plumber can pull the permit. Even where DIY is technically legal, most homeowner's insurance will deny a fire or explosion claim that traces back to DIY gas work. The materials are cheap. The labor is where the safety lives.
Almost always yes. New runs, line changes, appliance conversions (propane to natural gas or back), and most repairs need a permit and an inspection. Swapping an old appliance for a new one on an existing line is the one common exception in some cities. A plumber who says "we don't need a permit" is either wrong or hoping to save the fee at your expense.
Most gas appliances are rated at sea level. Every 1,000 feet up cuts their output by about 3 to 4 percent. Salt Lake City sits at about 4,200 feet, so appliances run about 15 percent below their rated output unless they're set up for altitude. Modern appliances come with high-altitude conversion kits. The installer is supposed to swap in the right part. Worth asking about.
A simple appliance hookup is 30 to 60 minutes plus the pressure test. A new short run for one appliance is half a day. A dedicated tankless line is usually most of a day. A whole-house re-pipe is multiple days. Pressure testing and waiting on the inspector adds time on top.
Depends on three things: (1) is gas already plumbed near the appliance, (2) does running new gas line cost less than new electric, (3) what are your local gas vs electric rates. In most of Utah, gas is cheaper per BTU than electric resistance heat, so big users (water heater, furnace, dryer) usually pencil for gas — IF the gas line is already there. If new line costs thousands, the math gets tighter. Heat pump electric is the third option worth pricing.
Older yellow CSST (installed widely in the 2000s) has been linked to fires when a nearby lightning strike arcs through the thin stainless wall. The fix is bonding — connecting the pipe to your home's grounding system so the strike has a path to ground. Bonding has been code-required for years. Newer black-coated CSST (FlashShield, CounterStrike) has that protection built into the outer jacket and doesn't need extra bonding. If your house has yellow CSST and you don't know if it's bonded, that's worth checking.
Five questions: (1) Are you pulling a permit and who's doing the final inspection? (2) What pipe material and size, and why? (3) Is the pressure test included, at what pressure for how long? (4) Will you install a sediment trap at every appliance? (5) Can I see the plumber's license number on the permit?
Before you trust the total
A fair plumber should be able to tell you what failed, what they plan to do, what is included, and what could change the price. If two quotes describe different work, the cheaper number proves nothing.
01
Quotes may be per defined run or project. Compare the route, pipe size and material, valves, appliance connector, pressure test, permit and inspection, wall access, and startup responsibility.
02
A meter upgrade, long run, finished-wall access, concealed route, multiple appliances, high-BTU equipment, rooftop work, or propane conversion changes the project.
03
Ask to see the appliance BTU input, developed length, pipe sizing basis, test and inspection scope. A line that reaches the appliance is not necessarily a line that can safely supply it.
