Gas Plumbing: Gas Lines & Gas Leak Detection

What to do if you smell gas

Natural gas and propane are odorless until a harmless additive is put in, which is what gives the rotten-egg smell. If you smell it, treat it as real until a qualified responder says otherwise.

1. Stop what you are doing and get everyone, including pets, out of the building.
2. Do not turn lights or appliances on or off, do not use a garage door opener, and do not light matches or lighters.
3. Do not use a phone inside the building; use it once you are outside and away.
4. Call the gas utility's emergency line or 911 from outside.
5. Stay away until the utility or fire department says it is safe to return.

What not to do

• Do not search for the leak with a flame.
• Do not try to tighten fittings or repair a gas pipe yourself.
• Do not assume a smell that faded is gone; gas can drift or collect.
• Do not re-enter to grab belongings.

After the emergency

Once the utility has made the area safe, they may shut off service until the source is fixed and tested. A plumber can then repair or replace the piping, and the utility restores service. Your area's process and what is required for reconnection are explained by the utility. For other urgent problems, see emergency plumbing.

What gas plumbing includes

Gas plumbing is the piping that delivers fuel from the meter (natural gas) or tank (propane) to each appliance, plus shutoffs, regulators, connectors and vents where needed. The work is regulated more tightly than water plumbing because a mistake can cause fire, explosion or carbon monoxide.

Common gas-plumbing jobs

Here is what people most often call about.

• Running a new line to a range, dryer, fireplace, grill or generator.
• Extending a branch to a garage heater, pool heater or outdoor kitchen.
• Repairing or replacing a leaking pipe, fitting or flex connector.
• Replacing an appliance shutoff valve.
• Connecting a new water heater or boiler to the gas supply.
• Pressure testing after any change.
• Locating and fixing a leak that a detector or utility has flagged.

Where plumbers and the utility divide the work

The utility usually owns the gas meter and the piping up to a certain point, and a plumber or qualified gas fitter works on the property side of that point, where rules apply locally. If you are unsure who owns what, ask the utility before you plan a project.

Gas line installation and repair

Gas line installation means designing, running, connecting and testing a new pipe to serve an appliance or a new part of the home. Gas line repair covers fixing corrosion, damaged fittings, worn connectors or sections that were poorly made. The details are on gas line installation and repair, and most large jobs also fall under broader plumbing installation.

How a new gas line is planned

A plumber checks the total load of the appliances the pipe will serve, the length of the run, the pipe material, the available pressure and the routing. Undersized gas pipe starves appliances, and a pipe that runs too long may need a larger size. Local codes decide what materials, supports and protection are allowed.

Pipe materials in gas plumbing

• Black iron: threaded steel pipe used widely inside homes.
• CSST: flexible corrugated stainless tubing that must be electrically bridged and grounded according to the manufacturer and local code.
• Copper: allowed in some areas and for some gases, and prohibited or restricted in others.
• Polyethylene: plastic pipe used underground for many outdoor runs.
• Appliance connectors: flexible connectors between the shutoff and the appliance, which should be used as directed and replaced when damaged.

Permits, inspection and pressure testing

Many jurisdictions require permits and inspections for new or altered gas piping, and the pipe is typically pressure tested before it is placed in service. Ask the plumber how permits and testing are handled; the details vary by city.

Repair or replace: gas pipes and fittings

Gas line repair depends on what is wrong. A loose fitting may be corrected with proper reassembly and testing, while corroded, damaged or improperly installed pipe is usually replaced.

• Rust, scaling or pitting on iron pipe.
• Flexible connectors that are kinked, cracked or very old.
• Fittings that show bubbles in a leak-test solution.
• Piping that was altered without permits or testing.
• Underground lines with damage from digging or shifting soil.

Do not wrap, tape or seal a leaking gas pipe as a fix. A plumber will shut off the supply to the affected section, repair or replace it, and test before restoring gas.

Gas leak detection: how leaks are found

Gas leak detection uses the sense of smell, electronic detectors, soap-bubble solution, pressure decay tests and, in some cases, specialized equipment. The right method depends on where the suspected leak is. See gas leak detection and gas leak detectors for the full explanation.

Gas leak detector versus gas detector

A gas leak detector for a technician is a handheld instrument that senses combustible gas at very low concentrations. A homeowner gas detector is a plug-in or wall-mounted alarm. They are not the same as a carbon monoxide alarm, which senses a different gas from incomplete combustion. Homes with fuel-burning appliances often need both types of protection, and each has its own placement rules.

Where detectors go

Natural gas is lighter than air and tends to rise, so alarms for it are commonly placed higher on a wall or near a ceiling. Propane is heavier than air and tends to settle low, so those alarms are usually placed near the floor. Always follow the manufacturer's instructions and local code for placement.

What a gas leak plumber does

A gas leak plumber checks the appliance connections and the pipe with a detector, tests joints with solution or pressure, and finds the source. The work includes shutting off the affected supply, repairing or replacing the faulty part and retesting. If the plumber finds an unsafe condition, the appliance or the line stays off until it is corrected.

Gas plumber near me: what people usually need

People searching for a gas plumber near me typically have one of a few needs. Naming yours when you call gets the right conversation started.

• A gas smell or a detector alarm.
• A gas line for a new appliance, such as a range, dryer or fireplace.
• A pilot light or appliance that will not stay lit, when gas supply is suspected.
• A new water heater or boiler connection.
• A pipe replaced during a remodel or addition.
• Leak testing before buying or selling a home.
• A landlord needing a gas safety check on a rental.

Availability and scheduling are confirmed by phone, and if a situation feels like an emergency, hang up and contact the utility or 911 first. To find help closer to home, see local plumbers.

Boiler installation and gas-fired heating

Boiler installation near me searches come from homeowners whose old boiler has failed or who are switching heating systems. A boiler heats water or makes steam for radiators or radiant floors; a gas-fired one needs a gas supply, a vent, a water connection, a condensate drain in high-efficiency models, a pressure relief valve and controls. Boiler installation services typically involve sizing, removing the old unit, piping, venting and testing.

What a gas boiler job includes

• Checking the gas supply size and adding or upgrading a line if needed.
• Setting the boiler and connecting supply and return piping.
• Installing a safe vent path and combustion air.
• Connecting a relief valve, expansion tank and drain.
• Testing the gas connection, combustion and safety controls.

Some of this work needs a heating specialist or a qualified gas fitter, depending on local rules, and permits may apply. Ask who will handle each part.

Why the gas line matters

A new boiler or furnace may need more gas than the old one, and a supply pipe sized for a smaller unit can starve it. Combustion depends on stable gas pressure and proper venting, and the plumber should check both.

Water heaters and gas

A gas water heater has a gas control valve, burner, flue and a shutoff at the supply line. Problems that look like water heater failures, such as a pilot that will not stay lit, may involve gas supply or venting. The bigger picture is covered in water heater repair and replacement, and a change to a different unit can be part of a water heater installation project. Propane models for on-demand heating are discussed in propane tankless water heater information.

Natural gas versus propane

The main difference is how the fuel arrives and what the piping and regulators must do. Natural gas comes from a utility main and meter; propane is stored in a tank on the property and delivered by a supplier.

• Natural gas: delivered by pipe, lighter than air, lower pressure at appliances.
• Propane: delivered in a tank, heavier than air, and used with different regulators and appliance orifices.
• Conversion: appliances are made for one fuel or come with a conversion kit, and conversion must be done by qualified people.
• Tanks and regulators: propane systems have extra parts to inspect.

Never assume a gas appliance can run on either fuel; check the label and instructions.

Gas plumbing in remodels, additions and outdoor living

New projects are the most common reason for a planned gas job, and gas should be part of the design early rather than an afterthought.

Kitchen remodels and ranges

Moving a range, adding a cooktop or changing an island layout often means extending or relocating the gas stub. The shutoff must stay accessible, and the connector must not be pinched behind the appliance. Kitchen and bath renovations that touch several systems are covered in bathroom remodel plumbing, and the same planning logic applies to kitchens.

Grills, fire pits and outdoor kitchens

Outdoor gas lines run underground or along a wall and are sized for the burners they feed. Buried polyethylene or protected metal pipe is common, and the route should avoid future digging areas. A quick-connect at a patio lets a grill be moved without disturbing the pipe.

Generators and pool or spa heaters

Standby generators and pool heaters draw a lot of gas, and adding one can overload a line built for a stove and furnace. A plumber checks the meter capacity and the pipe size before the equipment is ordered.

Buying or selling a home

A gas check before a sale can reveal old connectors, missing shutoffs or unpermitted pipe. If leaks or corrosion are found, the repair can be scheduled before closing rather than after.

Signs of a gas problem besides smell

Smell is the classic sign, but there are others, and any of them warrants attention.

• A hissing sound near a pipe, meter or appliance.
• Dead or dying vegetation over a buried line.
• Bubbles in standing water or wet soil near a line.
• A pilot light that burns yellow or orange rather than blue.
• Soot or staining around an appliance.
• Headaches, nausea or dizziness that improve when you leave the house, which can point to carbon monoxide; leave and call emergency services.

Property types: homes, rentals, condos and businesses

The right approach depends on who owns the piping and how many appliances share it.

Single-family homes

The homeowner is responsible for piping on the property side, and older houses may have added gas lines over time without testing. A whole-house check can be part of a remodel or a sale.

Rentals and multifamily buildings

Landlords typically handle gas repairs, and tenants should report smells, hissing and detector alarms immediately. Multifamily buildings may have shared risers and meters, so an odor can come from another unit.

Businesses and restaurants

Commercial kitchens have higher gas loads and stricter rules; see commercial plumbing for that side of the work.

Cost factors for gas plumbing

Gas jobs are priced by the work involved, not by a flat rate, and pricing is confirmed by phone after you describe the project. The main drivers are:

• Length and route of the pipe.
• Material and the number of fittings.
• Pipe size needed for the appliance load.
• Access through walls, floors, attics or trenches.
• Permit, inspection and testing requirements.
• Appliance connection and shutoffs.
• Whether existing piping must be upgraded.

For general context on quotes, see what affects plumber cost.

Choosing a gas plumber and what to ask

Because the stakes are high, ask questions before work starts. A good plumber answers plainly and does not rush past testing.

Questions worth asking

• Are you qualified to work on gas piping here, and how are permits handled?
• How will you size the pipe for my appliances?
• What testing will you do before gas is turned back on?
• Will the utility need to shut off or restore service?
• What could change the estimate once walls or soil are opened?

Red flags

Be wary of anyone who skips a pressure test, suggests sealing a leak with tape, offers to work without a permit where one is required, or cannot explain the pipe size they plan to use. Availability, including for an urgent "gas leak plumber" request, is confirmed by phone.

Preparing for a gas line visit

• Decide where the appliance will go and its fuel type.
• Have the appliance model and its gas input rating on hand.
• Clear access to the meter, the shutoff and the work area.
• Note any past gas repairs and any smells or alarms.
• Secure pets and plan for a short gas shutoff.

Seasonal and everyday gas safety

Heating season is when gas appliances work hardest and problems surface. Cold snaps push furnaces and boilers to run for long stretches, and a marginal connection or blocked vent shows up under that load. Before winter, keep vents and flues clear of snow, leaves and nests, keep the space around appliances free of stored items, and make sure alarms have fresh batteries. After a storm or flood, do not relight appliances that were under water; have them inspected first.

Myths about gas plumbing

• Myth: a faint smell is nothing. Fact: any gas smell deserves a call to the utility.
• Myth: you can fix a small leak with tape. Fact: tape or putty is not a safe repair on gas piping.
• Myth: a gas detector replaces annual appliance checks. Fact: detectors warn but do not fix or find poor installations.
• Myth: carbon monoxide alarms detect gas leaks. Fact: they sense a different gas.

Ask about our other plumbing services if your project touches more than one system, and about water lines if new gas piping shares a route with supply lines. A gas smell mixed with water damage may mean a wider leak and pipe repair problem, and tankless upgrades are compared in electric tankless water heater information. We take calls across the country, including your service locations area.

Where You Can Get Gas Plumbing Help

Plumbing calls are taken for 21 states, 1,511 cities and 3,769 ZIP codes. Pick your state, or look at a sample city and ZIP for each state; coverage for your exact address is confirmed by phone.

• Arizona
• California
• Colorado
• Connecticut
• Florida
• Georgia
• Idaho
• Illinois
• Maine
• Massachusetts
• Michigan
• Minnesota
• Missouri
• New Hampshire
• New Jersey
• New York
• North Carolina
• Ohio
• Texas
• Virginia
• Washington

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