How Much Does a Standby Generator Cost?

Published on July 9, 2026 | Written by Alec Pow
This article was researched using 14 sources. See our methodology and corrections policy.

A standby generator is a permanent outdoor backup power system that starts when the utility feed drops, then sends power through a transfer switch to selected circuits or the full panel. For U.S. homeowners, natural gas whole-house setups were listed at $6,000 to $11,000 installed in December 2025, with higher totals when the house needs a large unit, a long gas run, panel work, or propane storage through installed natural gas setup data.

The bill has two layers. The first is equipment, including the generator, enclosure, controller, battery, alternator, and automatic transfer switch. The second is site labor, including electrical wiring, fuel piping, pad placement, permits, inspection, startup testing, and any load-management work needed to keep central air, well pumps, sump pumps, refrigerators, or heat controls from overloading the system.

Generac, Kohler Home Energy, Cummins, Briggs & Stratton, Lowe’s, Home Depot, licensed electricians, gas-fitters, municipal inspectors, fuel utilities, CPSC safety rules, NFPA standby-power standards, transfer-switch ratings, gas meter capacity, propane storage, panel space, load calculations, concrete pads, and maintenance contracts all connect to the quote. A dealer price that only names the generator cabinet leaves out the trade work that decides whether the installed system stays simple or becomes a panel, piping, or placement project.

Plan the project as one installed system, not a generator box plus a small hookup. The unit size, fuel source, transfer-switch amperage, distance to the panel, and permit path decide the final quote.

How Much Does a Standby Generator Cost?

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• Installed whole-house generator range in April 2026 data: $350 to $13,500 (equivalent to 11.3 workweeks at $30 per hour, or about $5,400 in 1990 dollars), with an average near $5,161, from published installation cost data.
• Transfer switch installation in April 2026 data: $1,200 to $1,600, with an average near $1,450, from transfer-switch installation figures.
• Generator gas-line installation in January 2026 data: $400 to $1,500+, from fuel-line installation pricing.
• Annual maintenance in June 2026 data: $172 to $395 per visit, with yearly upkeep at $200 to $600, from generator service cost ranges.

Total for a 22 kW natural gas setup

A 22 kW air-cooled unit is a quote anchor for homes that want broad circuit coverage, central air support, and automatic switching. Using a Home Depot listing checked in July 2026, a Generac 22 kW package with a 200-amp transfer switch was priced at $6,839 (about $2,800 in 1990 dollars), and adding the transfer-switch installation figure cited above of $1,450 puts those two line items at $8,289 before fuel piping, pad work, and permits through the listed 22 kW package.

For a clean site, add a gas-line midpoint of $950, calculated from the $400 to $1,500+ generator gas-line range cited above, then add a pad midpoint of $275, calculated from a December 2025 concrete-pad range of $150 to $400, and a permit allowance of $250 from its $80 to $450 permit range through standby setup cost factors. The itemized example is $6,839 for the unit package, $1,450 for transfer-switch installation, $950 for gas work, $275 for the pad, and $250 for permits, so $6,839 + $1,450 + $950 + $275 + $250 = $9,764.

What you’re actually buying

A standby generator is a fixed backup power system, not a portable engine on wheels. It sits outside on a pad, connects to natural gas or propane, monitors utility power, and starts through a controller when the home loses grid power. The transfer switch keeps the house from feeding power back into utility lines.

The system differs from a battery because it makes power from fuel rather than storing electricity. It also differs from a portable generator because the wiring, fuel connection, placement, inspection, and startup test are part of the purchase. Generator brands and dealers may sell the equipment, but the installed result comes from the electrician, fuel trade, inspector, utility connection, and service plan working as one system.

What labor and equipment cover

The equipment side includes the generator cabinet, engine, alternator, controller, battery, transfer switch, and any load-management module needed to keep a large appliance from starting at the wrong moment. The labor side is different work: electrician time for conductors and panel tie-in, fuel-trade time for the gas line or propane regulator, pad placement, permit filing, inspection scheduling, and startup testing. A quote that looks low may be missing one of those trade lines.

That split explains why retail equipment pricing can be misleading. A homeowner may see a generator for several thousand dollars and still receive a finished quote that is higher because copper length, fuel pressure, meter capacity, panel condition, safe exhaust placement, and inspection steps are labor items, not accessories. Older homes can add service-panel work. Rural homes can add propane storage. Dense lots can add piping and wiring because the generator must sit where exhaust, airflow, doors, windows, property lines, and service access all work together.

Price ranges by size

Size is measured in kilowatts, but the quote is really about what the home wants to run at the same time. A small selected-circuit system may cover refrigeration, furnace controls, internet gear, a sump pump, and several lights. A larger whole-home system may need to start central air, a well pump, a second refrigerator, or an electric water heater. That matters.

System size	Planning price	Best fit
13 kW class	$3,957 (about $1,600 in 1990 dollars) MSRP starting point	Cummins lists this as an entry whole-house generator size in published model-price examples.
17 to 20 kW class	$7,000 to $11,000 installed planning band	Medium to large homes that need central air, refrigeration, heat controls, a pump, and selected everyday loads.
22 to 25 kW class	$9,500 to $24,000 installed planning band	Large homes with heavier starting loads, long gas runs, broader circuit coverage, or load-management modules.

The table shows why a load calculation matters before choosing a model. A smaller generator with load shedding may be cheaper than oversizing the unit, especially when the goal is refrigeration, heat controls, a well pump, and internet during outages. A bigger unit can still be the right call for homes with central air, multiple pumps, or high simultaneous demand.

Line items

The biggest quote jumps come from distance and capacity. A generator placed far from the electrical panel needs more conduit and wire. A generator placed far from the meter needs more fuel piping. Older panels may need breaker work or a subpanel. Gas meters may need review when the generator joins furnaces, water heaters, ranges, pool heat, and fireplaces on the same service.

Fuel layout can be the sleeper cost. A home that needs the meter relocated should price that separately before approving the generator, since a gas meter move can turn a simple fuel connection into a utility-coordination job. Propane homes have a different issue: the tank, regulator set, trench, delivery access, and first fill may sit outside the generator contractor’s base quote, so a 500-gallon propane tank plan can change the cash needed before the first outage.

Hidden costs

Ownership does not stop at startup. Whole-house generator maintenance was listed at $172 to $395 per service in the service-cost data cited above, with yearly upkeep at $200 to $600, and the work can include oil, filters, battery checks, air intake checks, diagnostic tests, and transfer-switch testing.

Ask the installer whether the first year includes a startup visit, a transfer-switch test, and a maintenance schedule. A lower installation bid can cost more later if the owner has to call a separate dealer for warranty work, firmware setup, or storm-season service.

Three quote cases

Budget case: a selected-load home with natural gas nearby may keep the project near the lower installed bands if the generator sits close to the meter and panel. The primary driver is short routing. Less conduit, less copper, less fuel piping, and fewer placement conflicts can keep the job closer to the unit-and-switch side of the budget.

Middle case: a storm-prone suburban home may choose a 20 kW to 22 kW air-cooled setup with automatic switching, gas piping, pad work, and permits. The driver is not just the unit size. It is the need to start central air or a well pump without dropping refrigeration, heating controls, and communications. High-load case: a large home with heavy HVAC, pool equipment, or multiple pumps can move into larger generator classes, load-management modules, or liquid-cooled options. In that case, the quote may be driven by electrical design and fuel capacity rather than the cabinet price alone.

Permits, inspections

Permits still matter. Generator installs can require electrical, plumbing or fuel-line, and zoning review. A September 2025 permit guide lists electrical permits at $50 to $200, plumbing permits for fuel lines at $50 to $150, and zoning permits often under $100. That means an electrical plus fuel-line permit starts at $100 because $50 + $50 = $100, and the same pair can reach $350 before zoning because $200 + $150 = $350 through generator permit cost ranges.

Placement is a cost issue as well as a safety issue. The generator must have service access, exhaust clearance, airflow, and a route for fuel and wiring. The U.S. Consumer Product Safety Commission warned in May 2026 to operate portable generators outdoors at least 20 feet from homes and buildings, with exhaust directed away from windows, doors, and vents, in carbon monoxide safety guidance. Stationary standby units have manufacturer and code placement rules too, so a tight side yard can move the generator farther away and raise both piping and wiring costs.

Who this cost makes sense for

A standby system makes the most sense when outage duration creates real losses or health risks. The strongest use cases are homes with sump pumps, well pumps, refrigeration, medical devices, remote work equipment, or winter heating controls that need power without someone setting up a portable unit in bad weather.

It is a weaker buy for homes with rare short outages, limited loads, or a rental situation where the owner cannot recover any value from permanent work. It also may lose to a battery system when the household wants indoor energy storage for brief outages rather than fuel-based runtime.

Makes sense if

• You need automatic backup for pumps, heating controls, refrigeration, medical equipment, or work-from-home systems.
• Your property has natural gas or a compliant propane location close enough to keep piping work reasonable.
• The electrical panel has room for a safe transfer-switch plan without a major service rebuild.
• Outages last long enough that rolling out a portable generator is risky or impractical.

Doesn’t make sense if

• Your outages are brief and a portable generator can safely cover a refrigerator, lights, and device charging.
• You rent the home or plan to move before the installed system can serve you.
• The gas meter, propane tank, or panel work would cost more than the backup-power benefit.
• You want short-duration backup with no engine maintenance, where a battery may fit better.

Answers to Common Questions

How long does it take to install a standby generator?

Many clean residential jobs can be completed over a few workdays after permits and equipment are ready. The calendar can stretch when the utility must review gas capacity, the panel needs upgrades, or the inspector requires placement changes.

Is a standby generator cheaper than a battery?

Not always. A generator can provide long runtime when fuel is available, but it brings engine maintenance, exhaust placement, and fuel costs. A battery can be better for brief outages and solar pairing, but stored energy is limited by capacity.

Can I install a standby generator myself?

A permanent standby system should be installed by licensed electrical and fuel professionals. The work involves utility isolation, gas or propane piping, permits, inspection, and startup testing.

What size standby generator does a house need?

The size depends on starting loads and selected circuits, not just square footage. Central air, well pumps, sump pumps, electric water heating, and kitchen loads can change the answer.