Gas Line Installation Cost (2026 Plumbing Guide)
💰 Cost Breakdown
| Item | Low | Average | High |
|---|---|---|---|
| Short Extension (Under 20 ft) Extending an existing gas line to a nearby appliance — typically a gas range replacing an electric one, or a dryer hookup within 10–20 feet of an existing gas line. Includes tee fitting, pipe run, shut-off valve, and appliance connector. Most common residential gas line job. | $250 | $450 | $600 |
| Medium Run (20–50 ft) Running a new branch line from the meter or manifold to a more distant appliance — gas fireplace insert, tankless water heater on an exterior wall, or outdoor kitchen. May require larger pipe diameter to maintain adequate pressure over the longer run. | $500 | $900 | $1,300 |
| Long Run (50–100+ ft) Major gas line installation to distant locations: detached garage, pool heater, workshop, or whole-house repiping. Often involves trenching for underground runs, upsizing from the meter, and multiple branch connections. May require gas utility to upgrade the meter. | $1,000 | $1,700 | $2,500 |
| Gas Line Repair or Leak Fix Locating and repairing a gas leak in an existing line. Involves pressure testing to isolate the leak, cutting out the damaged section, and replacing with new fittings. Emergency repairs cost more due to urgency and after-hours rates. | $150 | $350 | $700 |
| Permit and Inspection Required in all jurisdictions for new gas line work. Includes plan review, permit fee, and post-installation pressure test inspection by a municipal inspector. Some areas require two inspections (rough-in and final). | $50 | $150 | $250 |
| Trenching for Underground Lines Excavation for buried gas lines running to detached structures. Includes digging (typically 18–24 inches deep per code), bedding material, backfill, and surface restoration. Cost depends heavily on soil conditions and distance. | $5 | $12 | $20 |
Short Extension (Under 20 ft)
Extending an existing gas line to a nearby appliance — typically a gas range replacing an electric one, or a dryer hookup within 10–20 feet of an existing gas line. Includes tee fitting, pipe run, shut-off valve, and appliance connector. Most common residential gas line job.
Medium Run (20–50 ft)
Running a new branch line from the meter or manifold to a more distant appliance — gas fireplace insert, tankless water heater on an exterior wall, or outdoor kitchen. May require larger pipe diameter to maintain adequate pressure over the longer run.
Long Run (50–100+ ft)
Major gas line installation to distant locations: detached garage, pool heater, workshop, or whole-house repiping. Often involves trenching for underground runs, upsizing from the meter, and multiple branch connections. May require gas utility to upgrade the meter.
Gas Line Repair or Leak Fix
Locating and repairing a gas leak in an existing line. Involves pressure testing to isolate the leak, cutting out the damaged section, and replacing with new fittings. Emergency repairs cost more due to urgency and after-hours rates.
Permit and Inspection
Required in all jurisdictions for new gas line work. Includes plan review, permit fee, and post-installation pressure test inspection by a municipal inspector. Some areas require two inspections (rough-in and final).
Trenching for Underground Lines
Excavation for buried gas lines running to detached structures. Includes digging (typically 18–24 inches deep per code), bedding material, backfill, and surface restoration. Cost depends heavily on soil conditions and distance.
📊 Factors That Impact Cost
Run Length and Routing
High ImpactGas line cost scales directly with distance. A 10-foot run from an existing line is $250–$400; a 75-foot run from the meter to a detached structure is $1,500–$2,500. Routing through finished walls, ceilings, or underground adds complexity and cost versus exposed runs in crawlspaces or basements.
Pipe Material (Black Iron vs. CSST)
Medium ImpactBlack iron pipe is cheaper per foot ($2–$4/ft) but labor-intensive to thread and assemble. Corrugated stainless steel tubing (CSST) is flexible, faster to install ($5–$8/ft material but less labor), and approved in most jurisdictions. CSST requires proper bonding to the electrical grounding system to protect against lightning strikes.
BTU Load and Pipe Sizing
Medium ImpactGas pipe must be sized for the total BTU demand of all appliances it feeds. A high-demand appliance like a tankless water heater (150,000–200,000 BTU) may require upsizing the pipe from 1/2" to 3/4" or 1" — larger pipe costs more and may require upgrading the line from the meter.
Permit and Code Requirements
Low ImpactPermits cost $50–$250 and add 1–2 weeks for scheduling inspections. Some jurisdictions require a licensed master plumber (not a journeyman) for gas work, which may limit your contractor options and increase labor rates.