Quick answer: Most homeowners pay roughly $9,000 to $25,000 for a whole house generator installed, with many typical installs landing between $12,000 and $18,000. The generator itself is often only 40% to 60% of the bill; the gas line, transfer switch, electrical work, permits and pad make up the rest. All figures in this guide are estimates and vary by region and by home.
If you’re pricing out a standby generator, the whole house generator cost can look confusing because quotes bundle many separate line items. Some installers quote only the unit, others quote everything from permit to commissioning. Below, we break down each cost so you can compare bids on equal terms and spot what is pushing a quote up.
Ready to see real numbers for your home? You can request free local generator quotes using the form on this page.
Not sure what size you need? Use our generator size calculator to estimate the wattage for your home before you compare quotes.
Whole House Generator Cost at a Glance
Here are typical installed ranges (estimates, not guarantees) by system size:
- Small (7-12 kW): about $6,000 to $11,000 installed. Covers essentials like the fridge, lights, furnace fan and a few outlets.
- Mid-size (14-22 kW): about $9,000 to $18,000 installed. The most common range for a typical home with central air.
- Large (24-30 kW): about $12,000 to $22,000 installed. Handles larger homes, multiple AC units or well pumps.
- Very large (38 kW and up): about $20,000 to $45,000 or more. Usually liquid-cooled units for big homes and estates.
Those totals include the generator, labor, fuel connection, transfer switch, permit and pad. Now let’s look at each piece.
Generator Unit Price by kW Size
The unit price depends mostly on output (kilowatts) and cooling type. Air-cooled units are cheaper and common up to about 24 kW. Larger systems are typically liquid-cooled, which costs more but is built for heavier loads and longer run times.
- 7-10 kW: roughly $2,000 to $3,500
- 11-16 kW: roughly $3,000 to $5,500
- 18-26 kW (air-cooled): roughly $4,500 to $8,000
- 30-48 kW (liquid-cooled): roughly $9,000 to $18,000
- 60 kW and above: often $18,000 and up for the unit alone
Buying bigger than you need is one of the most common ways to overspend. Our planned guide on choosing the right generator size for your house will walk through load calculations in detail. Until then, ask any installer to show their load math rather than just recommending a size.
Installation Labor Costs
Labor for a standby generator install typically runs about $3,000 to $8,000, and it can exceed that on complicated jobs. That covers setting the unit, running conduit and wiring, mounting and wiring the transfer switch, connecting the fuel line, startup and testing. Some installers charge a flat rate; others bill hourly plus materials.
Labor goes up when the generator sits far from the electrical panel, when the panel needs upgrading, or when trenching is required through rock, roots or hardscape. Because licensed electricians and gas fitters are involved, labor rates in high-cost metro areas can run well above the national averages.
Gas Line Costs
Most standby generators run on natural gas or propane. Your fuel choice changes the cost picture, and we’ll cover the tradeoffs in a future comparison of natural gas vs. propane generators.
- Natural gas: If a line already runs near the install spot, expect about $500 to $1,500 to tap and extend it. Long runs, larger pipe or a meter upgrade can push this to $2,000 to $4,000 or more. Your utility may need to upgrade the meter to handle the added demand.
- Propane: You’ll need a tank, often a 250- to 500-gallon unit, plus piping and regulators. Tank purchase or installation can add roughly $1,500 to $4,000 or more depending on whether it’s above ground, buried, owned or leased.
Gas work generally requires a licensed plumber or gas fitter and an inspection, so this is not a place to cut corners.
Transfer Switch Costs
The transfer switch safely moves your home from utility power to generator power and prevents dangerous backfeeding to utility lines. Whole house systems use an automatic transfer switch (ATS). Expect about $500 to $1,500 for the switch itself and about $1,000 to $3,000 installed, depending on amperage (100, 200 or 400 amps) and whether it’s service-entrance rated.
Many homeowners also add load management modules, typically $300 to $700 each, so a smaller generator can run big appliances like air conditioners without overloading. We’re preparing a dedicated explainer on the generator transfer switch if you want to go deeper.
Permits and Inspections
Standby generator installs almost always require permits, usually electrical and often mechanical or plumbing for the fuel line. Permit and inspection fees commonly total about $100 to $1,000, depending on your city or county. Some municipalities also require site plans, setback compliance or HOA approval. Reputable installers handle the paperwork and build the fees into the quote, but confirm that it’s included.
Concrete Pad and Site Prep
The generator needs a stable, level base. Options include:
- Pre-formed composite pad: about $150 to $400, common for air-cooled residential units.
- Poured concrete pad: about $300 to $1,200, depending on size and local concrete costs. Larger liquid-cooled units need bigger, thicker pads.
Site prep can add more: gravel base, grading, trenching, removing shrubs or fencing, or building a retaining wall on a sloped yard. Codes also set minimum distances from windows, doors, vents and property lines, which can limit where the unit goes and lengthen your wiring and gas runs.
What Drives Your Whole House Generator Cost Up or Down
Factors that raise quotes:
- Larger kW size or liquid-cooled models
- Long distances between the generator, gas meter and electrical panel
- Electrical panel or service upgrades
- Propane tank installation or utility meter upgrades
- Difficult trenching, sloped lots or tight setbacks
- Sound-attenuating enclosures or upgraded weather and coastal-rated enclosures
- Higher local labor rates and post-storm demand surges
Factors that lower quotes:
- Right-sizing the generator with load management instead of oversizing
- Placing the unit close to both the gas line and the panel
- Installing in the off-season, when installers are less busy
- Comparing three or more written quotes
- Checking for any utility, state or local incentives on backup power equipment
Ongoing Costs to Budget For
Beyond installation, plan for annual maintenance of roughly $200 to $500 (oil, filters, spark plugs and inspection), plus fuel during outages. Many installers offer an optional service plan. Remote monitoring and extended warranties are also sold as add-ons, so read what is covered before you pay for them.
How to Compare Quotes
- Ask for itemized quotes showing the unit, labor, gas, transfer switch, permits and pad separately.
- Confirm the installer is licensed in your state and carries insurance, and ask who pulls the permits.
- Verify the model, kW rating, enclosure type and warranty terms.
- Ask what’s excluded, such as trenching, panel upgrades or the propane tank.
- Request a written load calculation supporting the proposed size.
Costs and code requirements vary by location, so always rely on a qualified local professional for a final price and compliance advice.
Want itemized pricing from installers near you? Request your free, no-obligation generator quotes with the form on this page.
Frequently Asked Questions
How much does a whole house generator cost installed?
Most installed systems cost roughly $9,000 to $25,000 (estimate). Smaller essential-circuit setups can be less, and large liquid-cooled systems for big homes can exceed $30,000.
Is a 22 kW generator enough for a whole house?
For many average-sized homes, 22 kW is enough, especially with load management on the AC. Homes with multiple HVAC systems, electric heat, a well pump or large square footage may need 26 kW or more. A load calculation from an installer gives the real answer.
Does homeowners insurance or a tax credit cover a generator?
Insurance generally doesn’t pay for a generator, though some insurers offer discounts. Incentives vary by state, utility and year, so check current programs and ask a tax professional before assuming any credit applies.
Can I install a standby generator myself to save money?
It is not recommended. The work involves gas piping, high-voltage wiring and a transfer switch, and most jurisdictions require licensed professionals and inspections. Mistakes can create fire, carbon monoxide and electrocution hazards, and DIY installs can void warranties.
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