Quick answerGas line installation in Spokane starts with a load calculation of every gas appliance on the system, then a route from the meter or an existing trunk, black iron or approved flexible pipe sized for the load, a shutoff and sediment trap at the appliance, and a pressure test before the gas is turned on. Permits and inspection apply.
Updated September 2026
Why gas line sizing matters
A gas line that is too small starves appliances when several run at once: the furnace fires while the water heater and range are on, and one of them runs poorly or throws an error. Adding a tankless water heater, a garage heater or a fireplace to an existing line is where this usually shows up.
We add up the input rating of every appliance on the system, measure the pipe lengths, and size each section so the far end gets full pressure with everything running. Then we test the whole system before anything is lit.
What affects the cost of a gas line
What every gas line install includes
Gas line work we do
Gas lines for new appliances
Ranges, dryers, water heaters, fireplaces, garage heaters and generators all need their own branch with a shutoff valve and, where required, a sediment trap. We run the line from the nearest trunk with capacity, or from the meter when the existing system cannot carry the load, using black iron inside the house and approved materials where flexible connectors are allowed. Each branch is labeled at the appliance, and we leave the valve in a place you can reach quickly, not behind the appliance where nobody can get to it in a hurry.
Outdoor gas lines for grills and heaters
Outdoor lines for built-in grills, fire tables and patio heaters run underground or along the house to a quick-disconnect or a hard connection. Buried lines use approved plastic pipe with a tracer wire so they can be located later, transitioning to steel above ground with proper risers. We plan the route around sprinklers and landscaping, set the depth to code and pressure test before backfilling. The line gets a shutoff where it leaves the house so it can be closed off in winter.
Gas leak repair and pressure testing
If you smell gas, leave the house and call the gas utility from outside first. Once they have made it safe, we find the leak with a combustible gas detector and a pressure test, which usually points to a fitting, a flex connector or a corroded section. We repair it, retest the whole system and relight the appliances. We also pressure test systems when appliances are added or a house changes hands, since a small leak is easier to fix before it becomes an emergency.
Gas appliances in a Spokane home
In a Spokane house the gas line often feeds a furnace that runs for most of the year, plus a water heater, a range and sometimes a fireplace or garage heater. Long heating seasons mean the furnace is almost always on when a new appliance fires, which is why we size new branches for everything running together rather than for the new appliance alone.
How a gas line job runs
- 1
Add up the load
Every appliance's input rating counted.
- 2
Plan the route
From the meter or a trunk with capacity.
- 3
Quote and permit
Written scope, permit filed.
- 4
Install
Pipe run, supported and protected.
- 5
Shutoff and trap
At each appliance connection.
- 6
Pressure test
System proven tight before gas is turned on.
- 7
Connect and light
Appliance connected, lit and checked for leaks.
Signs of a gas line problem
Gas line questions
What should I do if I smell gas?
Leave the house, then call the gas utility from outside. Do not use switches or phones inside.
Can my existing line handle a new appliance?
It depends on the load and pipe size. We calculate it before adding anything.
Do I need a permit for a gas line?
Yes. Gas line work requires a permit and inspection.
Can you run gas to an outdoor grill?
Yes, underground or along the house, with a shutoff.
How long does a new line take?
A simple indoor branch takes a few hours; long or outdoor runs take a day or more.
Other gas & water heating services we handle
Water Heater Replacement
Sized, quoted and permitted.
Water Heater Replacement detailsGarage Heater Installation
Sized, quoted and permitted.
Garage Heater Installation in SpokaneElectric to Gas Furnace Conversion
Sized, quoted and permitted.
How we handle electric to gas furnace conversionAdding a gas appliance? size the line first.
Call for gas line installation in Spokane, WA.
