Gas line work is permitted work. We pull and process the permit, hard-pipe the line from the meter, sleeve it where it passes through floors and walls, bring a shut-off valve out where a person can actually reach it, connect the appliance with a properly supported flex connector, then pressure test the line — and on the jobs we run that way, the final pieces are connected only after the inspection has passed. Every one of those steps exists because we have been called out to fix a line where one of them was skipped.
When you need a new gas line run
Most of our gas line installations come from one of these:
- Converting a house to gas. New meter on the side of the house, then hard-piped runs to the appliances — we have done these covering a range, a furnace, a water heater, an outdoor grill and a fireplace on one contract.
- A new gas range or cooktop where the kitchen has only ever had electric.
- A gas fireplace, fire table or outdoor grill, including lines carried out through the exterior wall and, in one case, buried out to an outside fireplace connection.
- A standby generator. Those jobs start with both the electrical and the gas permits pulled before anything is poured or piped.
- A new furnace or water heater, where the existing line has to be reconnected, resized or corrected — see water heater installation and heating and furnace installation.
- Relocating an appliance. One tankless conversion moved the heater into a laundry room and needed twenty-five feet of new gas line and twenty-five feet of new flue run out to the side of the house.
- A kitchen remodel that moves the appliances — gas and plumbing lines get relocated to the new layout. See kitchen remodeling.
How a gas line is run from the meter to an appliance
- Pull the permit first. Gas work is inspected work, and on our contracts the final connections are made after the inspection passes.
- Tap the meter and hard-pipe from there. The run out of the meter is rigid pipe, not a flexible connector.
- Route it the shortest sensible way, strapped to joists or run tight against a block wall so nothing can be caught or knocked. On kitchen work we run the line hugging the back of the cabinet, not standing proud of the wall.
- Sleeve every penetration. Where the line passes through a floor, a wall or the exterior envelope, it goes through a sleeve and gets sealed.
- Bring a shut-off valve out where it can be reached — in front of a cabinet, not behind an appliance and not on the floor.
- Cap and valve anything the homeowner will connect later. On conversions we stub out a capped line with a shutoff valve to the furnace and the water heater where those connections are coming later.
- Connect the appliance with a flex connector, supported so it cannot drop or kink, with a regulator where the appliance calls for one.
- Pressure test the line, then have it inspected.
Routing is decided in the field more often than people expect. On a meter relocation we planned to fish roughly six to eight feet of pipe inside a wall and were prepared to run it across the basement instead if the pipe would not fit. On another job the crew could not tap the existing line as planned at all, because a previous owner had built the crawl space up with dirt until there was no clearance between the ground and the floorboards — so the line was routed by drilling through the concrete walls between the furnace room and the kitchen instead.
Gas line defects we find from previous installations
A homeowner once called us because the gas line behind a kitchen cabinet was not hugging the wall closely enough. That was the complaint. This is what the inspection found:
- The gas line passing through the floor with no sleeve around it.
- The gas valve laid down on the ground, where nobody could reach it in a hurry.
- The gas flex hose pulled so tight it was kinking, and kinking right next to an electrical box.
- No permit had ever been pulled for the original installation.
The correction was to disconnect the previous company’s line entirely, drill down from the cabinet to the basement, run a new dedicated line sleeved through the floor, drill through the side of the cabinet and run the pipe tight to the back wall, fit a new gas shut-off valve and a new flex hose — and pull the permit.
On a separate call, the gas line serving a water heater was resting directly against the heater. The original installer had run the nipple so far across that the line made contact with the jacket, and the drip leg sat too high as a result. We opened the ceiling to expose the joint, shortened the nipple, replaced the partial line, held the finished gas line three to four inches clear of the heater and lowered the drip leg by roughly twelve to fifteen inches — then pressure tested and pulled the permit.
Drip legs, sediment traps and gas shut-off valves
- The drip leg
- A short capped length of pipe below the appliance connection that catches moisture and debris carried in the gas before it reaches the burner or control valve. Its height matters — one we were called to had been set far too high to do anything, and it was lowered as part of the correction.
- The sediment trap
- The same principle applied at the appliance. It is a code item on a gas appliance connection, not an optional extra, and it is one of the things we add when a previous installer left it out.
- The appliance shut-off valve
- There has to be one, and it has to be reachable. We install them in front of cabinets and beside appliances deliberately. The worst example we have corrected was a valve lying flat on the ground behind a cabinet.
- Capped stub-outs
- Where a line is run for an appliance that is not there yet, it is capped and valved rather than left open, and the final connection is made when the appliance arrives.
- Clearance
- Gas pipe should not rest against an appliance jacket, a duct or an electrical box. Mechanical stress on a live gas connection is exactly what it sounds like.
Gas flex connectors and where they belong
A flexible connector is for the last short distance to a movable appliance — a range, a dryer, a water heater. It is not a substitute for piping, and it is the component we most often find abused.
- Not kinked. A connector pulled too tight to reach an appliance is a connector under permanent stress. We found one kinking against an electrical box.
- Supported. On a cooktop installation we strapped the flex hose to the cabinet so it could not drop behind the unit over time.
- Not run through walls, floors or cabinets. Where the line has to pass through structure, it is rigid pipe in a sleeve.
- Replaced, not reused. On water heater changeouts the gas flex connector is renewed as part of the job, along with the nipple, union and shut-off valve where those are due.
- Attached to sound pipe. We have replaced broken gas valves and partial rusted-out gas line at appliances where the connector itself was the only new-looking component.
Sizing a gas line for the appliance
An appliance that will not run right on a line that looks perfectly sound is usually a sizing problem, and it is normally created by whoever installed the appliance rather than by whoever installed the pipe.
On one HVAC replacement the original gas line was judged too small to serve an 80,000 BTU furnace and had to be addressed as part of the work. On another call, a homeowner asked for a gas regulator to be installed; the technician fitted it but flagged plainly that the regulator might not be sufficient to operate the appliance, because the company that had installed the new furnace appeared not to have calculated the BTU requirement against the pre-existing gas line. The line was then turned off, leaded, air tested, a partial section replaced and a cut-off valve installed, with the permit pulled.
The practical point for a homeowner: when you add a gas appliance, the question is not only “is there a gas line near it,” it is “will that line carry this appliance as well as everything already on it.” That gets worked out before anything is connected.
Gas line leak repair and pressure testing
If you smell gas, leave the building and call the gas utility from outside first. Once the supply is made safe, the repair is ours.
- Test to locate the leak. On one call gas testing put the leak at the bottom of the floor, on a line running inside a plastic sleeve — not somewhere it would ever have been found by eye.
- Shut off the gas to the house and, when the work is done, relight the fixtures.
- Replace the failed section, and where the whole run is suspect, discuss replacing it rather than patching it. On that job the line was ultimately buried and the pipe replaced from the cut-off valve all the way out to the outside fireplace connection.
- Renew the valve and union at the appliance end where they are part of the failure.
- Bleed the gas down and pressure test before anything is put back into service.
- Pull the permit and have it inspected, connecting the final pieces after it passes.
Where a gas line passes through a foundation, that penetration matters too. On one house the foundation had cracked where the gas pipe passes through it, and the opening was chiseled out and sealed with structural epoxy as part of the exterior repair.
Do you need a permit for gas line installation in Virginia?
Yes, and it is not negotiable. Every gas line installation, relocation, repair and appliance connection we perform is permitted work, pulled and processed by us, performed to the Virginia building code and inspected before the job closes out. On generator installations that means both the electrical and the gas permit before the slab goes in.
Two things follow from that. First, we do not connect final pieces of a new gas line until the pressure test and the inspection are done — that is written into how these jobs run. Second, the final payment on permitted work is held until the inspection passes.
If a previous installation was never permitted, that is worth knowing about before you sell the house or make a claim. On the kitchen job described above, the homeowner confirmed that no permit had been pulled for the original work — which is usually the first clue that the rest of it will not stand up to inspection either.
What gas line installation and repair costs
We do not quote gas work by phone and we do not publish numbers. The distance from the meter, whether the pipe can be fished inside a wall or has to cross a basement, what has to be drilled through, whether the crawl space can even be worked in, the size the line has to be for the appliance load, and the permit and inspection all decide the job — and none of them can be judged from a description.
An estimator comes to the property, works out the route and the sizing, and gives you a written price before anything is started. If we find that an existing installation has defects that have to be corrected to pass inspection, you will be shown them and told before the work begins, not after. For a gas appliance that has stopped working right now, see emergency plumber.