Standby Generator Install Cost (2026) — Typical US Range

Installing an air-cooled standby generator on a common US single-family house — a residential kilowatt rating, an automatic transfer switch, a short natural-gas or propane connection, a level pad, a permit, and a panel that can already accept the switch — often clusters around $8,000–$15,000. The wider national spread, about $5,000–$30,000, covers a smaller air-cooled unit on an easy site in a lower-cost area at the low end and a liquid-cooled unit, a long fuel run, a new propane tank, or electrical work the generator forces at the high end. A service above 200 amps, a trench that cuts a driveway, or a unit built for a commercial load can clear that spread. This is a planning range, not a quote.

The price on the generator carton is not the job. The machine at a dealer can look like a few thousand dollars. The bid is the automatic transfer switch, the gas piping, the pad, the permit, startup, and whatever the panel has to become before that switch is legal to land. Price the site and the service you have, not the steel box.

A portable generator with a cord, and a manual interlock kit, is a different product. It is not the floor of this range.

What the range includes

The typical band assumes an existing single-family home, one air-cooled standby generator of a common residential size, an automatic transfer switch, a short fuel connection — a few feet from a natural-gas meter that can already supply the unit, or from a propane tank that is already there — a level concrete pad or another pad the manufacturer and the inspector accept, a permit, inspection, and startup. The generator and the switch are included. A panel upgrade, a new propane tank, and a liquid-cooled unit are not.

Kilowatts are the size of the machine. A smaller air-cooled unit — often something like 10 to 14 kilowatts, a size class, not a sizing rule — is the sort of install that sits toward the floor of the typical band when the site is easy. A larger air-cooled unit, often something like 18 to 24 kilowatts, sits higher in that band. Liquid-cooled equipment, a larger class than those air-cooled units, leaves the typical band. A load calculation picks the number, including a heat pump or an EV charger if those loads have to stay on. A chart that multiplies square feet by a watt guess does not.

An easy side-yard install in a lower-cost area, with the meter close and the panel already able to take the switch, sits toward the floor of the typical band. A larger air-cooled unit, a load-shedding switch, or a high-labor metro on that same short run sits at the top of the band. It can leave the band without any trench.

The floor of the national spread, near $5,000, is that smaller air-cooled standby on a simple site. It is not a portable generator, and it is not a unit priced without the transfer switch. The top, toward $30,000, is where a liquid-cooled generator, a long gas line or a meter upgrade, and a panel or service upgrade usually land together. A new buried propane tank, a 400-amp service, or a bore under a driveway can clear that top. Treat a number above it as a different scope and ask which driver caused it.

Adding the typical band on the electrical panel upgrade guide to this one is how a combined project moves out of the typical generator band and into the wider spread. The panel price is not inside the $8,000–$15,000 cluster. Do not fold the service into the generator bid, and do not fold the generator into the panel bid.

None of the bands include a new driveway, a screen wall treated as its own design project, or the heat pump the generator is meant to carry. If the gas line or the conduit has to cross the driveway, cutting or boring the pavement is its own cost, and so is any paving repair afterward. Price that surface on the driveway guide. A heat pump, a Level 2 EV charger, and an electric range are loads the generator and the panel both have to account for. Price those appliances on their own guides.

As a cross-check, not a bid: an air-cooled unit with a standard automatic transfer switch and a short fuel connection is the typical band. A service-entrance switch, a load-shedding switch that manages a heat pump and a charger, or a generator on the far side of the house is often discussed from the top of that band into the wider spread. A liquid-cooled unit sits in that wider spread. Ask for a generator-only price and a panel-upgrade price as two proposals if nobody has looked at the service yet. Ask for the generator model, the kilowatt rating, and the switch model as their own lines so you can see the machine versus the piping.

Region changes the labor, the permit, and the utility schedule. A clear side yard in a lower-cost area, with the gas meter a few feet away, sits toward the floor of the typical band. The same air-cooled unit in a high-labor city, on a tight lot, with a crane over the house or a setback that forces a longer run, sits at the top of that band and can leave it. A cold-weather kit, and a unit that has to sit farther from windows because of a local setback, are lines on the bid. They are not a second national figure. Permit fees and gas-utility charges vary by place. Ask for them as their own lines. A rebate, where one is open, is a separate approval. These ranges do not subtract one, and a rebate is not a reason to skip the permit.

What moves the price

Driver	How it changes the bid
Kilowatts	A smaller air-cooled unit sits toward the floor of the typical band. A larger air-cooled unit sits toward the top. Square footage is not a sizing rule. A load calculation is.
Air-cooled or liquid-cooled	Air-cooled is the typical job. Liquid-cooled equipment costs more to buy and usually more to set, and it leaves the typical band for the wider spread.
Fuel	Natural gas uses a line from the meter and may need a larger meter. Propane uses a tank, a regulator, and a line. A short connection to fuel you already have is the planning job. A new tank or a meter upgrade is not.
Transfer switch	A standard automatic transfer switch is inside the typical band. A service-entrance switch, or a load-shedding switch for a heat pump and an EV charger, is a larger electrical scope. A manual interlock is a different product and is not this range.
Panel and electrical	A panel that can accept the switch is assumed. A full panel, a service that cannot carry the loads you want backed up, or a long conduit run is the panel guide plus the wire.
Permit	An ordinary electrical permit, and a gas or mechanical permit where the city requires one, belong in the bid. An HOA review or a historic-district review is extra time, and sometimes extra design.
Concrete pad	A level pad the manufacturer and the inspector accept is the planning job. A slope, a retaining edge, or a crane to the backyard is labor.
Gas line	A few feet of piping is ordinary. A trench across the yard, a bore under a walk or a driveway, or a meter the utility has to change moves the job out of the typical band.

If the generator is there so a heat pump or a Level 2 charger keeps running, say so before anyone picks kilowatts. Those loads are large, and they may be the reason the panel has to grow. A generator sized for a furnace blower, a refrigerator, and a few lights is a different machine from one sized to run the heat pump, the charger, and the range together. The furnace and the generator can share a gas meter. A meter upgrade for the generator is still its own line.

A circuit you want on the generator is a transfer-switch question before it is a reason to buy more kilowatts. Have the electrician list the circuits. Buying a larger unit so everything can run at once can push an air-cooled job into liquid-cooled money.

DIY or hire

Hire a licensed contractor for the generator, the gas piping, and the electrical connection. The automatic transfer switch ties into the service. The permit, the gas piping, and the inspection are the work. Many jurisdictions will not treat a connection at the main panel, or a new gas line, as an owner project. A generator that backfeeds the utility lines puts a line worker at risk.

You can still decide which side of the house the unit sits on, which circuits you want backed up, and whether the fuel is natural gas or propane. Clear the path. If you buy the unit yourself, confirm that the model is listed for a residential standby install and that the contractor will stand behind the piping, the switch, and the startup. Do not land the switch in the panel and ask someone to close the cover.

Keep shrubs, windows, and the air-conditioner condenser in mind when you pick the spot. Local rules often set the unit back from openings and from the property line. A spot that fails that setback is a second project. After a licensed startup, a homeowner can follow the manual for the exercise cycle and keep the area clear. That is maintenance. It is not an installation.

A portable generator and a manual interlock, where local rules allow that arrangement, are not this guide. Do not treat them as the cheap version of a standby unit.

Repair or replace

Repair when the generator is younger, it has been exercised and serviced, the engine and the alternator still carry the load, and one part failed: a battery, a charger, a starter, a control board, or a voltage regulator. Ask for the repair price next to a replacement price. A repair that is a large fraction of a new installed unit, on a machine already late in its life, is usually the wrong purchase.

Replace when the engine or the alternator has failed on an older unit, the controller is obsolete and parts are no longer available, or the house has added loads — a heat pump, an EV charger, a workshop — that the kilowatt rating cannot carry. A new battery on a generator that will not stay running under load is still the old generator.

Have the technician check starting, transfer, and the fuel supply before you choose. A unit that fails its exercise cycle can be a dead battery, a setting, or a gas meter that is too small. Those are different repairs. A new generator does not fix a panel that is obsolete or heat-damaged. That decision is the panel guide. A new panel does not, by itself, put a generator on a pad.

How to use this number

Ask for bids that state the generator model and kilowatt rating, air-cooled or liquid-cooled, natural gas or propane, the transfer-switch model, which circuits it covers, the length and path of the fuel line, whether a tank or a meter upgrade is included, whether the pad is included, who pulls the permit, and whether a panel upgrade is included or excluded. Compare an air-cooled unit with a short fuel run and a panel that can take the switch with the typical band. Compare liquid cooling, a long gas line, a new tank, and a panel upgrade with the wider spread, and make the panel and the fuel path options so you can see the generator versus the service.

These bands are the cost of the work. They do not subtract incentives. A utility or local rebate, where one is open, is a separate approval. Do not accept a bid that has already subtracted a rebate you have not received.

A very low bid on a standby generator is a reason to ask whether the transfer switch, the pad, the fuel line, and the permit are included, not a reason to celebrate. A high bid should name the liquid-cooled unit, the trench, the tank, the meter, or the panel. Two or three local bids on the same pad and the same circuits are the number that matters. How this site sets the band is explained on the methodology page.