How much does it cost to run a gas line for a furnace or garage heater?
A gas line for a furnace or garage heater costs $350–$2,000 nationally, per HomeGuide. Extending a line to a nearby appliance runs about $350–$800 and a new line from the meter $500–$2,000. In Minnesota, distance, pipe size, finished spaces, frozen ground and the permit drive the price.
Key points
- National cost guides such as HomeGuide put a gas line run at $350–$2,000, roughly $15–$50+ per linear foot.
- Pipe is sized to the total BTU load it carries and the length of the run, not to one appliance.
- A high-efficiency furnace doesn't need a bigger gas line. Input BTUs decide that, and a new furnace often has a smaller input than the old one.
- Big additions like a tankless water heater or a garage heater are what push a house past its existing piping or meter.
- Gas piping normally needs a permit and a pressure test that the inspector sees before walls or ceilings close up.
A replacement furnace in the same spot usually reuses the existing gas line, so the question mostly comes up when you add an appliance or switch fuels, and then it becomes a whole-house question about total load.
What drives the cost of running a gas line?
These are typical national ranges from HomeGuide's 2026 gas line guide, not local quotes and not our prices:
| Job | Typical national range |
|---|---|
| Extend an existing line to a nearby appliance | $350–$800 |
| New line from the meter to one appliance | $500–$2,000 |
| Per linear foot | $15–$50+ |
The spread comes from the house, not the pipe. A short run across an open basement ceiling is quick. The same run through a finished basement, around ductwork and up a wall costs more, and a line to a detached garage that has to go underground costs more again. Every fitting and turn adds labor, and the permit and inspection are part of the job.
For a sense of the whole project, HomeGuide's typical national range for an installed gas garage heater is $500–$2,000+, plus $350–$2,000 if a gas line has to be run to it. Its national range for an installed tankless water heater, $2,100–$5,600, already counts gas line upsizing among the things that move the price.
How is gas pipe sized for a furnace or heater?
Gas piping is sized from tables in the fuel gas code. Two numbers go in: the total input of everything that pipe section feeds, in BTUs per hour, and the length of the longest run. Too small a pipe and appliances starve for gas when several run at once, which shows up as poor flames, lockouts or a furnace that underfires on the coldest night.
That's why adding an appliance is a whole-house question. A new branch may be fine on its own while the trunk line feeding it is already near its limit.
Common additions that push a house over:
- Tankless water heaters. Many residential models are rated up to 199,000 BTU per hour, which can be more than a typical furnace and tank water heater together. See our tankless vs tank comparison.
- Garage heaters. A unit heater running at the same time as the furnace on a cold night adds a lot of load. Our garage heater guide covers the heater side.
- Ranges, fireplaces, pool heaters and standby generators. Each adds load, and generators are large.
What doesn't push it over is a more efficient furnace. Gas demand follows input, not AFUE. A 96% furnace sized with a Manual J load calculation often has a smaller input than the oversized 80% furnace it replaces. Our AFUE explainer covers the ratings. When a furnace is sized right, it can free up gas capacity for something else.
What pipe materials can a gas line use?
- Black steel pipe. Threaded rigid pipe, the traditional choice for trunk lines and exposed runs. Durable, but every joint is cut, threaded and sealed by hand.
- CSST. Corrugated stainless steel tubing with a plastic jacket. It snakes through joists with fewer joints. It has to be bonded to the home's electrical grounding as the manufacturer and code require.
- Elevated-pressure systems. Some newer homes run gas at a higher pressure through the house, with a regulator stepping it down near the appliances. Those need parts rated for it.
At each appliance, expect an accessible shutoff valve and a sediment trap (a short capped pipe below the connection that catches debris before it reaches the gas valve). Flexible appliance connectors have limits on length and where they can go, and they don't pass through walls or floors.
Permits, pressure tests and propane
A gas piping job generally follows the same order:
- List every gas appliance the piping will feed, with the input from each rating plate, including anything you plan to add later.
- Ask the gas utility whether the meter and regulator can carry the new total.
- Size the pipe from the code tables and plan the route.
- Get the permit before the work starts. Who can pull it varies by city, so ask the building department before you hire.
- Install the piping, then pressure-test it with air and hold the test for a set time.
- Have the inspector see the test before any wall or ceiling closes up.
- Purge the line, light the appliances and check the gas pressure at each one.
Propane adds a supplier to the picture. In many rural homes the supplier owns the tank and the regulators, sets the pressures and leak-checks the system when a tank is set or after it runs empty. An appliance built for natural gas has to be converted for propane with the manufacturer's kit. If you're weighing propane against other fuels, our propane heating costs post covers it.
If you ever smell gas (the rotten-egg odorant) or hear gas hissing, leave the house and call your gas utility or propane supplier from outside.
Minnesota specifics: frozen ground, meters and utilities
Underground runs deserve their own planning in Minnesota and Western Wisconsin. Buried gas pipe is usually plastic (polyethylene) rated for burial, laid with a tracer wire so it can be found later, and it changes to steel before it comes above ground. Trenching frozen ground in January is slow and costly when it can be done at all, so a line to a detached garage or shop is a summer or fall project. Before anyone digs, call 811 for a utility locate: Gopher State One Call in Minnesota, Diggers Hotline in Wisconsin.
The meter side belongs to the utility. CenterPoint Energy supplies natural gas in Minneapolis and much of the metro, Xcel Energy supplies gas in Saint Paul, and Minnesota Energy Resources and other utilities serve other towns, so who you call depends on your address. The utility decides whether the existing meter and regulator can carry a bigger load, and a meter change happens on its schedule. If a winter project depends on one, ask in the fall.
Through the winter, keep snow and ice off the meter and regulator, and don't let a roof edge drip onto them. Utilities ask customers to keep regulator vents clear, because a vent frozen over can upset the pressure reaching the appliances.
Which heating projects need new gas piping?
| Project | New gas piping? | What decides it |
|---|---|---|
| Furnace replacement in the same spot | Usually no | The existing line is reused; the shutoff, sediment trap and pressure get checked |
| 80% furnace to a 96–98% furnace | Usually no | Gas demand follows input, not efficiency |
| Garage unit heater | Yes, a new branch | Load on the trunk line, distance, and an underground run for a detached garage |
| Tankless water heater | Often a larger line | High input, and whether the meter can carry it |
| Range, dryer or fireplace | A new branch | Total load and the route |
| Standby generator | Often | Large input and meter capacity |
| Oil or propane to natural gas | New service and meter | Whether the utility's gas main reaches your street |
- Furnace replacement. Usually no new line, as above. A right-sized furnace can even lower the load on your piping. Our furnace installation page explains what a replacement includes, and our furnace replacement cost guide covers the price.
- Oil to gas. A new gas service and meter are part of the job, and our post on oil to gas conversion covers it. National cost guides such as HomeGuide put the whole conversion at $6,000–$20,000.
- Skipping gas. If there's no gas line where you need heat, such as a garage, addition or three-season room, a ductless heat pump heats and cools on electricity alone. Our heat pump installation cost guide has the prices.
Next steps
If a gas line is part of a bigger heating project, plan it with the equipment, not after. Get the load of every appliance you plan to add, ask your gas utility about meter capacity early, and get the permit before the work starts. If a furnace, boiler or heat pump replacement is on the list, call 612-429-3465, open 7 days, 7am–9pm, and we'll look at the whole system and give you a written quote, whether it's furnace installation in Minneapolis or a farmhouse on propane.
Common questions about heating
Do I need a bigger gas line for a high-efficiency furnace?
Usually not. Gas pipe is sized to the input rating in BTUs per hour, not efficiency. A condensing furnace sized with a load calculation often has a smaller input than the 80% furnace it replaces, so it needs the same or less gas. Upsizing comes up when you add other big appliances to the same piping.
Can I run my own gas line?
Rules on who may do gas piping and who may take out the permit vary by city, and some limit homeowner permits to the home you live in. Whoever does the work, expect a permit, a pressure test and an inspection before the piping is covered. Call your city or county building department first.
What is CSST gas pipe?
Corrugated stainless steel tubing is flexible gas pipe with a plastic jacket, usually yellow or black. It snakes through joists with far fewer joints than threaded steel pipe. Manufacturers and the fuel gas code require it to be electrically bonded, because lightning-induced current can damage unbonded tubing.
Will the gas company need to change my meter?
Possibly. The meter and regulator are sized for a certain total load. If you add a large appliance, such as a tankless water heater or a big garage heater, ask your gas utility early whether the meter can handle it. Meter changes are scheduled by the utility, and that can take time.
Sources
- HomeGuide cost guides (2026 editions) homeguide.com