Gas Line Repair and Replacement Costs: What Homeowners Should Expect

If you constantly thought about everything that could go wrong at any given moment with your home’s plumbing system, you’d be in a perpetual state of anxiety. Water pipes can burst, flooding your house, and potentially causing structural damage and mold growth. Drains can get backed up and sewer lines can clog, leading to particularly stinky cleanup. But arguably the most frightening plumbing disaster you can face as a homeowner is one you might not associate with “plumbing” at all, though it is: a gas line leak.

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The incomplete combustion of certain fuels, like natural gas, can produce carbon monoxide. Carbon monoxide is often referred to as the “silent killer,” as it is a colorless, odorless, almost undetectable gas. Likely, you’re familiar with the concept of carbon monoxide poisoning, which happens when carbon monoxide builds up in the blood, replacing oxygen and eventually suffocating you. Carbon monoxide can also combust, causing a devastating fire in your home.

Needless to say: If you suspect something is wrong with your gas lines, you shouldn’t wait to schedule a repair or replacement with a licensed and qualified plumber. If you do suspect a gas leak, turn off the natural gas to your home at the shutoff valve, leave the premises and call 911.

But just scheduling a repair is easier said than done, of course, and repairs can be pricey. Average gas line repair and replacement costs have increased up to 16% over the past four years — according to aggregated HomeServe data as reported by our nationwide network of contractors — while as many as 41% of homeowners have less than $500 saved for a home repair emergency.

A look at national average repair prices might help ease the sticker shock by giving you an idea of what that bill from the plumber might look like.

Something to keep in mind is that a lot of plumbers (like many other types of service professionals) charge a “callout” fee. Often referred to as a “diagnostic” fee, this is basically just how much it’s going to cost to get a plumber to drive to your home and look at your system. Even if they don’t find anything wrong, they will likely bill for this time.

The prices below reflect repair costs as of December 2024, and are based on national data. Costs in your community could be higher or lower, depending on a number of factors. This pricing does not reflect emergency repairs, which can often cost more due to services needed on short notice or after hours.

Interior Natural Gas Supply Line Repair: $861

Simply put, gas lines bring natural gas inside and throughout your home to be used for HVAC systems, water heaters and gas stoves. Your gas company is responsible for maintaining the gas lines outside of your home, up to your gas meter. The point where the main gas line from the gas company meets your home’s gas piping is called a “service line.” From that point onward, the gas supply lines are generally the responsibility of the homeowner.

Repairing a damaged, worn or leaking portion of gas piping, up to 25 feet long, carries a national average cost of $861. This price is 7% higher than in 2022 and 17% higher than in 2020.

Furnace Gas Supply Line Replacement: $501

Upon entering your home, natural gas is fed through a network of smaller, branching lines that eventually end up at your gas-powered appliances, like gas fireplaces, gas stoves and furnaces.

To replace the section of piping that supplies gas to your furnace, you can expect to pay somewhere around the national average cost of $501. Prices have increased 8% since 2022, and 18% since 2020.

Gas Shutoff Valve Repair or Replacement: $197

Gas shutoff valves are one of the most vital components of your home’s natural gas system. In an emergency situation like a leak, or during repairs, the shutoff valve allows the flow of gas to be completely turned off. A broken shutoff valve — especially if you find yourself with one in a particularly dire situation — could put your home in peril.

Being a comparatively simple task, repairing or replacing that safety shutoff will run you about $197, based on the national average. That’s 8% more than in 2022 and 18% more than in 2020.

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