Gas line installation on Long Island. Permitted, pressure-tested lines for conversions, ranges, generators and pool heaters.
A new gas line for a range or dryer typically costs $500–$1,500; standby generator lines run $750–$2,000; pool heater runs, which are long and large-diameter, reach $900–$2,500. Every job includes the permit, pressure test and inspection, and the price is quoted in writing first.
Gas piping is one trade where corners cut invisibly become emergencies later, which is why every line we run is permitted with the town, pressure-tested above operating pressure, and signed off by the inspector before gas ever flows. That is not an upsell; it is how the work is legally done on Long Island, and it is what protects you when an insurance adjuster or a home inspector traces the piping years later. Homeowners in Woodbury and Island Park call us most often after discovering that a previous renovation left unpermitted gas work behind a wall — correcting it is routine for us, and the paper trail we leave means nobody has to solve the mystery twice.
Sizing is the technical half of the job. A gas line is sized for the total connected load at the distance it travels, and the classic failure is a generator or pool heater teed casually onto a line that was sized for a furnace alone. The appliance starves at full fire, burners misbehave, and the symptom gets blamed on the equipment.
National Grid owns the gas main in the street, the service line to your house and the meter. Everything after the meter is licensed contractor work, and that is where we come in. For new service — a home converting from oil, or new gas appliances where no service exists — we prepare the load information National Grid's application requires, and we sequence our piping and equipment work around their meter date so nothing sits half-finished. Converting from oil altogether is its own project with its own economics; our oil to gas conversion page walks through the full cost picture, and this page's piping prices are one component of those totals. Whatever the project, the pattern holds across Long Island: quoted upfront, permitted, pressure-tested, inspected, documented.
Scheduling is straightforward for interior work and weather-dependent for trenched exterior runs, and we tell you which category your job falls into when we quote it. Suspected gas leaks are a different matter entirely: if you smell gas, leave the house, call National Grid's emergency line first, and call us for the repair once the utility has made the scene safe. That order matters, and it is the one piece of advice on this page worth memorizing.
Any dig on your property starts with a free utility mark-out; New York 811 is required before excavation, and we handle the call as part of the job.
| Job | Typical Long Island Price | Notes |
|---|---|---|
| Range or dryer line | $500 – $1,500 | Run length and routing set the price |
| Standby generator line | $750 – $2,000 | Sized for full-load draw at distance |
| Pool heater line | $900 – $2,500 | Long runs, larger pipe, trenching included |
| Pressure test and inspection | Included | Every job is permitted and tested before gas flows |
Ranges reflect typical Nassau and Suffolk pricing. Your exact price is quoted upfront after diagnosis. Prices as of August 2026.
Yes. Gas piping in Nassau and Suffolk townships requires a permit, a pressure test and an inspection, performed by a licensed contractor. We include all of it in every quoted price, and the documentation stays with the house for future inspections and sales.
Typically $500–$1,500 depending on the distance from the meter and how the line has to route through the house. A kitchen directly above the meter is the easy case; a line crossing a finished basement to a kitchen island is the harder one. Quotes are firm and given in writing.
Yes, and sizing is the critical part: a standby generator at full load draws more gas than most furnaces, and it needs that volume at distance, outdoors, in winter. We size from the manufacturer's spec sheet and pressure-test the completed run, typically for $750–$2,000.
Both, in order. National Grid installs the service line and meter; a licensed contractor runs everything after the meter. We prepare the load paperwork the National Grid application needs and coordinate our piping schedule with their meter date, so you are not managing two timelines yourself.
Warning signs are gas odor, hissing near piping, dying houseplants along a buried run, and appliance burners that starve at full fire. Older homes with additions sometimes carry piping that was never permitted. A leak search and pressure test settles it, and we quote any correction before touching a fitting.
Yes, with properly trenched and sleeved exterior piping at code depth. Long outdoor runs are routine for pool heaters and outdoor kitchens; the run length and pipe size drive the price, which is why these jobs are quoted after a site visit rather than over the phone.
The honest conversion math.
Right-sized new furnaces.
Navien and other combi and tankless units.
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