Gas Line Repair: Signs of a Gas Leak, Costs & When to Call a Pro

Key takeaways:

• If you smell gas, leave the house first. Call your gas utility or 911 from outside.
• A rotten egg smell, a hissing sound, and dead plants over a buried line are the most common signs of a gas leak.
• Your utility usually handles the lines up to the meter. You are responsible for the gas lines after the meter.
• Most gas line repairs cost $150 to $1,000. New lines and full replacements cost more.
• Gas line work requires a licensed pro, a permit in most areas, and a pressure test before the gas goes back on.

What to Do Right Now If You Smell Gas

If you smell gas in your home, stop reading and follow these steps:

1. Leave the house right away and bring everyone with you, including pets.
2. Do not turn lights or appliances on or off. Do not use a lighter, a match, or your phone inside the house.
3. Leave the door open behind you if you can do it quickly.
4. Once you are a safe distance away, call your gas utility's emergency line or 911.
5. Do not go back inside until the utility or fire department says it is safe.

Gas utilities respond to leak calls at no charge in most areas. Once they find and shut off the leak, you will need a licensed pro to repair the line on your side of the meter.

How Gas Lines Work in Your Home

Natural gas reaches your home through a service line from the street. It passes through a meter, usually on the side of the house, and then flows through pipes inside your home to each gas appliance. Common gas appliances include furnaces, water heaters, ranges, dryers, fireplaces, and outdoor grills.

Who is responsible for which part?

Section	Who usually handles it
Main line in the street	Gas utility
Service line from the street to the meter	Gas utility in most areas
Meter and regulator	Gas utility
Pipes from the meter to your appliances	Homeowner
Buried lines to a detached garage, pool heater, or grill	Homeowner

Rules vary by utility, so check with yours if you are unsure. In general, anything after the meter is yours to maintain and repair.

Warning Signs of a Gas Line Problem

Utilities add a chemical to natural gas so it smells like rotten eggs. That smell is the most common warning sign, but it is not the only one. The Pipeline and Hazardous Materials Safety Administration lists signs you can see, hear, and smell when a gas line leaks.

Signs you can smell

• A rotten egg or sulfur smell inside or outside the house
• A smell that gets stronger near a gas appliance or the meter

Signs you can hear

• A hissing or whistling sound near a gas line or appliance
• A louder roar near the meter or an outdoor line, which can mean a large leak

Signs you can see

• Dead or yellow grass and plants over a buried gas line
• Bubbles in standing water or a puddle near a line
• Dirt or dust blowing up from the ground
• A damaged connector behind a range, dryer, or water heater

Signs inside your home

• A gas bill that rises with no change in use
• A burner flame that burns yellow or orange instead of blue
• Pilot lights that keep going out
• Headaches, dizziness, or nausea that ease when you leave the house

Do not rely on smell alone. A leak underground can lose its odor in the soil before it reaches the surface. If you notice any of these signs, have the line checked.

Natural Gas vs. Carbon Monoxide

Many homeowners confuse a gas leak with carbon monoxide, but they are different problems.

	Natural gas	Carbon monoxide (CO)
Source	A leak in a gas line or connection	Fuel that does not burn completely in an appliance, fireplace, or car
Smell	Rotten egg smell from added odorant	No smell, no color
Main danger	Fire or explosion	Poisoning
How to detect it	Smell, sound, natural gas detector	CO alarm only

A gas appliance with a cracked heat exchanger or a blocked vent can produce carbon monoxide even without a gas leak. The Consumer Product Safety Commission recommends CO alarms on each level of the home and outside sleeping areas. Test them monthly and replace the batteries every year.

Common Causes of Gas Line Damage

• Corrosion. Older steel pipes can rust over time, especially in damp basements and crawl spaces or underground.
• Loose fittings. Joints and connections can loosen as a house settles or when someone moves an appliance.
• Old flexible connectors. Uncoated brass connectors from older installs can crack. Most should be replaced with modern coated connectors.
• Digging. Fence posts, landscaping, and new patios can hit buried lines.
• Ground movement. Frost heave and soil settling can stress buried pipes.
• Poor installation. Lines that someone installed without a permit or pressure test can leak at joints.

Types of Gas Line Work

Leak repair

A pro locates the leak, shuts off the gas, and repairs or replaces the damaged section or fitting. Small leaks at a fitting are often quick to fix.

Line replacement

If pipes are badly corroded or several leaks show up, replacing a section or the whole system may make more sense than repeated repairs. Many pros use corrugated stainless steel tubing (CSST) or black iron pipe for replacement work.

New gas lines for appliances

Switching from an electric range or dryer to gas, adding a gas fireplace, or installing a standby generator all need a new line. Outdoor additions such as grills, fire pits, and pool heaters often need a buried line.

Pressure testing

After any repair or new install, the pro pressurizes the line and checks that it holds pressure. Many cities require an inspector to see this test before the utility turns the gas back on.

Gas Line Repair Costs

Job	Typical cost
Leak detection service call	$150 to $400
Repair a leak at a fitting or connector	$150 to $500
Replace a section of interior pipe	$300 to $1,000
New gas line to an indoor appliance	$250 to $1,000
New buried line to a grill, fire pit, or pool heater	$500 to $2,500
Gas line for a standby generator	$500 to $2,500
Replace gas piping for a whole house	$2,000 to $6,000 or more
Pressure test	$100 to $300

What affects the price

• Location of the leak. A leak behind finished drywall or under a slab costs more to reach than one in an open basement.
• Length of the line. Longer runs need more pipe and labor.
• Digging. Buried lines add trenching costs. Rocky soil and long distances raise the price.
• Permits and inspection. Permit fees vary by city.
• Emergency service. Nights, weekends, and holidays usually cost more.
• Wall and floor repair. Some quotes include patching. Many do not.

If your quote seems low, check what it covers. Our article on how to hire a plumber explains how to compare quotes and spot red flags.

Why Gas Line Work Needs a Licensed Pro

Gas line work is not a DIY job. A small mistake at a single joint can lead to a fire or explosion. A licensed pro has the training, tools, and testing equipment to do the work safely.

Depending on your state and city, a licensed plumber, a licensed HVAC contractor, or a licensed gas fitter can do this work. Here is what a licensed pro handles:

• Sizing the line so each appliance gets enough gas
• Choosing the right pipe and fittings for the location
• Pulling a permit and scheduling the inspection
• Running a pressure test before the gas goes back on
• Bonding and grounding the line where code requires it

Unpermitted gas work can also cause trouble when you sell your home or file an insurance claim. Our guide to permits and contractors explains how to confirm your project meets local rules.

Call 811 Before You Dig

Before you dig for a fence, a deck, a tree, or a garden bed, call 811 at least a few days ahead. The free service sends utilities to mark buried lines in your yard.

Utilities only mark the lines they own, which usually ends at the meter. Lines you own, such as a buried line to a grill or a detached garage, may not appear in the markings. A private locating service can find those lines for a fee.

How to Prevent Gas Line Problems

• Schedule a yearly check of your furnace, water heater, and other gas appliances
• Ask the technician to check flexible connectors and shut-off valves at each appliance
• Keep the gas meter clear of snow, ice, plants, and debris
• Do not hang items on gas pipes or use them as shelf supports
• Move appliances with care so you do not strain the connector
• Install CO alarms and test them every month
• Know where your gas shut-off valves are, both at the meter and at each appliance

Is a Gas Line Problem an Emergency?

A strong gas smell, a loud hissing sound, or a CO alarm is always an emergency. Leave the house and call from outside.

A faint smell near one appliance, a rising gas bill, or a yellow burner flame is not a reason to panic, but it should not wait. Shut off gas to the appliance if you can do so safely, and call a pro the same day. Our guide to same-day home repair services explains which problems need help right away.

Questions to Ask Before You Hire

• Are you licensed for gas work in this state, and are you insured?
• Will you pull the permit and schedule the inspection?
• Does your price include the pressure test?
• What type of pipe will you use, and why?
• Does the quote include wall, floor, or yard repair?
• What warranty do you offer on the work?

Get Matched With a Licensed Gas Line Pro

Gas line work is not the place to take chances on an unknown contractor. My Licensed Contractor screens contractors and matches homeowners with licensed pros in their area. Tell us what you need, whether that is a leak repair, a new line for a range, or a buried line to an outdoor kitchen, and get connected with a pro who can do the job safely.

Submit your gas line project request on My Licensed Contractor to get started.

Frequently Asked Questions

What does a gas leak smell like?

Natural gas has no smell of its own. Utilities add an odorant that smells like rotten eggs or sulfur. If you notice that smell inside or outside your home, leave and call your gas utility from a safe distance.

Who fixes the gas line, the utility or a plumber?

In most areas, the utility handles the lines up to and including the meter. A licensed plumber, HVAC contractor, or gas fitter handles the lines after the meter. Your utility will usually shut off gas to a leak and then tell you to call a pro for the repair.

Can I repair a gas line myself?

No. Gas line work needs proper sizing, fittings, a pressure test, and usually a permit. A mistake can cause a fire or explosion. Always hire a licensed pro.

How long does a gas line repair take?

A small leak at a fitting can take an hour or two. A new line or a section replacement often takes half a day to a full day. If your city requires an inspection, the gas may stay off until the inspector approves the work.

Does homeowners insurance cover gas line repair?

Many policies cover damage from a sudden event, such as a fire caused by a leak. Repairs for wear, rust, or old age are often not covered. Some utilities and insurers offer separate service line coverage. Check your policy for details.

How often should gas lines be inspected?

Have your gas appliances and connectors checked once a year, usually during furnace maintenance. Older homes with steel pipes may benefit from a full gas line inspection every few years.