Detached Garages · Generators · Pool Heaters · Outdoor Kitchens

Underground Gas Line Installation, Repair & Replacement in Chicagoland

Licensed, insured underground gas work for Chicago homes and suburbs

From a buried line to a pool heater, generator, or detached garage, our licensed pros dig, install, and repair underground gas lines the right way the first time. Call (708) 381-2959 anytime across Chicago and the suburbs and we will get a tech on the way, with 24/7 callback day or night.

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When You Need Underground Gas Line Work (vs. Interior)

Plenty of gas projects never leave the basement, but the moment fuel has to travel across your yard, the job goes underground. The most common reasons Chicago-area homeowners call us for a buried line are:

Pool and spa heaters sitting out by the deck, away from the house.
Whole-home standby generators set on a pad along the foundation.
Detached garages and workshops that need heat or a gas appliance.
Outdoor kitchens, fire pits, and built-in grills on the patio.

Each of these means running a new branch from your meter or an existing manifold out to the appliance. That is different from a basic interior gas line installation feeding a stove or dryer, where the pipe stays inside conditioned space. Underground work adds digging, dig-locate clearance, deeper code requirements, and surface repair afterward. Planning a patio grill drop? Our guide to an outdoor BBQ & patio gas line install walks through what that project looks like start to finish.

Materials: Yellow Polyethylene (PE) vs. Coated Steel

Buried gas lines are not the black iron pipe you see indoors. Two materials do almost all underground work, and the right choice depends on soil, length, and how the line connects to your home.

Yellow polyethylene (PE): a flexible plastic pipe that will not rust, making it the go-to for most suburban yard runs. It is fast to install and forgiving in long, straight pulls. Because plastic cannot come above grade or into the house, it needs a code-approved anodeless riser transition fitting where it surfaces.
Coated steel: a steel pipe wrapped in a protective coating, used where the line must surface, cross under a driveway, or run shallow. It is rigid and durable but must be protected against corrosion.

Most buried gas lines in Illinois are placed at least 12 to 18 inches deep, deeper under driveways. We size the pipe to your appliance's BTU demand and verify the transition fittings and tracer wire are correct so the line can always be located later.

Locating, JULIE 811, and Cook County Permits

Before any shovel hits the ground, the buried utilities have to be marked. In Illinois that means a free JULIE 811 dig-locate request, which sends out the utilities to flag gas, electric, water, and communication lines. We file the locate, wait the required notice period, and respect every paint mark and flag on your property. This is the law, and it keeps everyone safe.

Permits depend on where you live. The City of Chicago has its own plumbing and gas permitting through the Department of Buildings, and the gas-side coordination runs through Peoples Gas. In the suburbs, Nicor is usually the utility, and each county and village handles permits differently. A buried line in Naperville (DuPage), Arlington Heights (Cook), or Joliet (Will) may each require its own permit and inspection. As a licensed, insured contractor, we pull the right permits and schedule inspections so your line is documented and approved.

Trenchless vs. Open-Trench Replacement

When an aging buried line needs gas pipe replacement, there are two ways to get the new pipe in the ground, and we recommend whichever protects your property best.

Open-trench: we excavate a continuous trench along the line's path, lay the new pipe, and backfill. It is the most direct method, ideal for shorter runs or where access is easy. The trade-off is more surface disturbance to lawn, pavers, or landscaping.
Trenchless gas line replacement: using small entry and exit pits, we pull new PE pipe underground without opening the whole path. This spares mature trees, patios, and driveways, and is a favorite for finished yards in places like Oak Park and Hinsdale.

Trenchless is not right for every layout, and soil, depth, and the existing route all factor in. We will look at your yard and tell you honestly which approach saves you money and mess.

How We Detect Underground Gas Leaks

If you smell gas outdoors, near the meter, or over a buried line, leave the area and call 911 or your utility first. Get everyone clear before anyone investigates. Once it is safe, our techs locate the source. Underground leaks are trickier than indoor ones because the gas migrates through soil, so we layer several methods during gas leak detection:

Bar-hole testing: we drive small probe holes along the line's path and sample the soil for gas, pinpointing where it is escaping.
Soap (bubble) testing: at exposed fittings and risers, a soap solution bubbles wherever gas is leaking out.
Electronic gas detectors: sensitive sniffers read trace concentrations in the air and soil that a nose can miss.

After a repair, we confirm the line holds with gas pressure testing before backfilling, so we know the fix is sound and not just the part we could see.

What Underground Gas Line Work Costs

The honest answer is that an underground job is priced by your yard, not by a flat menu. The biggest cost factors are:

Distance: a longer run from the meter to a back-corner generator or pool heater means more pipe, more digging, and more labor.
Depth and obstacles: rock, roots, high water tables, and crossing under a driveway all add time.
Surface restoration: putting back sod, pavers, concrete, or a finished patio costs more than restoring open lawn.
Permits and inspection fees, which vary by village and county.

Our straightforward repairs start from $199, while a full buried run for a generator or outdoor kitchen ranges higher based on the factors above. For a fuller breakdown, see our notes on gas line installation cost in Chicago. Get a written quote — every home is different.

Who Owns the Line: Utility Side vs. Your Side

One of the most common questions we hear is simple: whose pipe is it? The split usually falls at the meter. The service line running from the street main to your meter is owned and maintained by the gas utility — Peoples Gas in the city, Nicor across most suburbs. If the problem is on that side, the utility handles it, often at no charge to you.

Everything downstream of the meter — the customer line feeding your home and any branches out to a generator, garage, or pool heater — is your responsibility as the homeowner. That is the private-side work we do. If you are not sure which side a leak or pressure issue is on, call the utility to check their portion first; if it is your side, we step in. We routinely sort this out for homeowners in Evanston, Schaumburg, and Glenview so nobody pays for work that was not theirs to do.

Service areas for underground gas line installation

Underground gas line installation requests are routed across Chicago and the surrounding suburbs.

Common Questions

Underground Gas Line FAQs

How deep does an underground gas line have to be buried?

In Illinois, buried gas lines are typically installed at least 12 to 18 inches below grade, with deeper cover required where a line crosses under a driveway or other traffic area. The exact depth depends on the pipe material, your village or county code, and the appliance it serves. We set the proper depth, add tracer wire so the line can always be located, and confirm it on the permit and inspection.

Do I need a permit to run a gas line to my generator or pool heater?

Yes. Underground gas work to a generator, pool heater, outdoor kitchen, or detached garage requires a permit almost everywhere in the Chicago area, plus a JULIE 811 dig-locate before we dig and an inspection after. The City of Chicago permits through the Department of Buildings, while suburbs in Cook, DuPage, Lake, and Will counties each have their own process. As a licensed, insured contractor, we handle the permits and inspections for you.

What does it cost to repair an underground gas line?

It depends on the length of the run, how deep we dig, soil and obstacles, and what surface has to be restored afterward. Straightforward repairs start from $199, and full buried runs for a generator or outdoor kitchen run higher based on those factors. We never quote a one-size price over the phone. Get a written quote — every home is different.

Should I use polyethylene or steel for a buried gas line?

For most suburban yard runs, yellow polyethylene (PE) is the standard choice because it does not rust and installs efficiently in long runs. Coated steel is used where the pipe must surface, run shallow, or cross under a driveway. PE always needs a code-approved anodeless riser where it transitions above ground. We pick the material based on your soil, line length, and how it connects to the house, then size it to your appliance's BTU demand.

What should I do if I smell gas outside near a buried line?

Treat it as an emergency. Leave the area, keep everyone away from the spot, and avoid any flames, sparks, or switches. Call 911 or your gas utility (Peoples Gas in the city, Nicor in the suburbs) first. Once the area is confirmed safe, we handle the private-side detection and repair, including bar-hole and electronic testing to find the source and a pressure test to confirm the fix.

Is the gas line in my yard my responsibility or the utility's?

The service line from the street main to your meter belongs to the utility — Peoples Gas or Nicor — and they maintain it. Everything past the meter, including the customer line into your home and branches out to a generator, garage, or pool heater, is the homeowner's responsibility. That private-side work is what we do. If you are unsure which side a problem is on, call the utility to check their portion first, and we will take it from there.