Whole House Generator Installation Cost: What You'll Actually Pay
See whole house generator installation cost by size and what drives the price up. Call a licensed local pro now for a fast, free quote.
Whole house generator installation cost typically falls between $6,000 and $18,000 installed, with most homeowners paying $8,000 to $14,000 for a properly sized standby unit. The exact number depends on the generator's size, the condition of your electrical panel, and how far the unit sits from a gas line or propane tank. A generator install falls under licensed electrical service work, the same panel and wiring job your licensed electrical repair team already handles.
Call a licensed local pro now for a fast, free quote on your generator installation.
Whole House Generator Cost by Size (kW Guide)
Installed cost scales with the generator's output in kilowatts, from a small essentials-only unit up to a 22kW system built to run the whole house, AC and well pump included.
| Generator size (kW) | Best fit | Typical installed cost |
|---|---|---|
| 7-10 kW | Small home or condo, essential circuits only | $4,500-$8,500 |
| 12-16 kW | Mid-size home, most major appliances | $7,500-$12,000 |
| 20-22 kW | Most popular size, true whole-house coverage | $10,000-$16,000 |
| 24kW and up | Large home, multiple HVAC zones, well pump | $14,000-$25,000 |
These are typical ranges, not quotes. Get two or three written estimates before you commit; site conditions move the number more than the generator itself does.
What's Included in That Price
It breaks into several line items, not just the crated unit:
- Generator unit. The standby generator, sized to your home's electrical load.
- Automatic transfer switch (ATS). Senses an outage and shifts your load to the generator within seconds, often quoted as its own generator transfer switch installation.
- Electrical labor. New circuits, tying the ATS into your panel, wiring the control module.
- Concrete pad. The level, code-compliant base the unit sits on outside.
- Gas or propane line work. Extending a line from the meter, or setting a tank if not on natural gas.
- Permits and inspections. Most jurisdictions require a permit and a final inspection before sign-off.
A contractor handling the full whole house generator installation opens with a site visit, pulls permits, coordinates the fuel hookup, then finishes in one to two days with a start-up test.
What Affects Your Total Cost
- Panel condition. An older panel or service under 200 amps often needs an electrical panel upgrade before it can accept a transfer switch.
- Site complexity. Distance from the gas meter, slope, tree roots, and generator-to-panel distance add labor hours.
- Brand and features. Remote monitoring, quieter enclosures, or longer warranties cost more than base models at the same kW rating.
- Region. Permit fees, labor rates, and inspection rules vary by city and utility.
Why This Isn't a DIY Project
Wiring a transfer switch incorrectly can backfeed power into utility lines, a real shock hazard for line crews restoring power after an outage. Most jurisdictions require a licensed electrician to pull the permit and an inspector to check the switch and grounding before sign-off. Skipping that step typically voids the warranty and risks a resale headache.
Hidden Costs Most Guides Don't Mention
Older homes carry cost surprises a per-kW price doesn't capture. Check these before you budget:
- Panel rated under 200 amps, which blocks a transfer switch until it's upgraded.
- Gas meter too small for the generator's BTU draw, meaning a utility upgrade first.
- HOA design review or setback approval for outdoor equipment, adding weeks and sometimes a resubmission fee.
- Pad site needing grading, a retaining wall, or tree removal to clear the required setback.
- A failed rough-in inspection, meaning a return trip and a re-inspection fee.
Ask your installer to walk the property and flag these before quoting, not after the pad's poured.
Natural Gas vs. Propane: Which Costs Less to Run?
Natural gas is generally cheaper to run day to day, billed at a lower utility rate than propane with no tank refills to budget for. It's also usually cheaper to hook up, since you're tapping an existing line rather than adding tank delivery and burial. Propane costs more per gallon but stores on-site, which matters if the gas utility goes down during a major storm. Running cost lands in the $2 to $10 per hour range depending on size and load, and budget another $150 to $400 a year for professional maintenance regardless of fuel type.
Portable Generator vs. Whole-House: Cost Compared
A portable generator costs far less upfront: $500 to $2,500 for the unit, plus $200 to $600 in labor for a manual transfer switch and a few dedicated circuits, against $6,000 to $18,000 installed for a whole-house standby system. The trade-off is coverage. A portable generator backs up only the circuits you choose, needs someone to fuel and start it once the power drops, and wears out faster under regular outage use. A standby system starts itself in seconds, runs off your home's gas line, and keeps everything you wired running whether or not anyone's home. Rare, predictable outages favor the portable route. A well pump, medical equipment, or frequent time away favor the standby system instead.
Is a Whole House Generator Worth the Cost?
Homes that lose power more than once or twice a year, or that depend on a well pump, medical equipment, or a home office, usually see a standby generator earn its keep in avoided spoiled food, burst pipes, and lost work time. It rarely returns its full cost at resale, though buyers in outage-prone areas do notice one. If outages where you live are rare and short, the portable option above may cover you for far less. Check whether your utility or state energy office offers a rebate for standby generation; there is no federal tax credit for one, unlike solar.
Quote Checklist: What to Compare Before You Sign
Run every bid through this list before you pick a contractor:
- Same scope, side by side. Each quote should cover the same generator size plus the pad, permits, and gas or propane work, not just the unit and labor.
- Right-size it. Bigger isn't automatically better; an oversized unit costs more upfront and burns more fuel than you'll use.
- Financing terms, not just the payment. Ask for the APR and total cost over the full term, since a low monthly payment can still add up to more than paying cash.
- Bundle the paperwork. Roll in a needed panel upgrade to save a second mobilization charge, and confirm the installer pulls the permit under their own license.
Frequently Asked Questions
How much does a whole house generator cost installed?
Most jobs run $6,000 to $18,000 total, with $8,000 to $14,000 covering typical single-family homes once the unit, transfer switch, labor, pad, and permits are included.
What size generator do I need for my house?
An electrician sizes it off your square footage and which circuits you want backed up. Essentials-only coverage often lands in the 7-10kW range; 20-22kW is the most common pick for full whole-house coverage.
Is a whole house generator worth the cost?
Usually, if outages hit more than once or twice a year or you rely on a well pump, medical equipment, or a home office. If outages are rare and short, a portable unit may cover you for less.
How much does it cost to run a whole house generator?
Roughly $2 to $10 per hour in fuel, depending on size, load, and whether it runs on natural gas or propane.
Does homeowners insurance cover a whole house generator?
Some policies partially cover an installed unit, and a few insurers offer a small discount for having one. Coverage varies by carrier, so confirm with yours before you install.
How long does a whole house generator last?
Most standby units run 15 to 25 years with routine maintenance, though the engine and battery often need service or replacement before the unit itself is retired.
Get an exact number for your home. Call a licensed local pro now for a fast, free quote on your whole house generator installation.
FAQ & Troubleshooting Nodes
Q:How much does a whole house generator cost installed?
Most installations run $6,000 to $18,000 total, with $8,000 to $14,000 covering the bulk of typical single-family homes once you include the unit, transfer switch, labor, pad, and permits. Site conditions and panel condition can push either end of that range further.
Q:What size generator do I need for my house?
A licensed electrician sizes it off your home's square footage and which circuits you want to keep running during an outage. Homes covering just the essentials often land in the 7-10kW range, while a 20-22kW unit is the most common choice for full whole-house coverage.
Q:Is a whole house generator worth the cost?
It usually is if you lose power more than once or twice a year, rely on a well pump or medical equipment, or work from home. If outages in your area are rare and short, a portable unit covering a few circuits may be enough at a fraction of the cost.
Q:How much does it cost to run a whole house generator?
Expect roughly $2 to $10 per hour in fuel, depending on the generator's size, how much load it's carrying, and whether it runs on natural gas or propane. Add a yearly service visit on top of that for oil, filters, and a battery check.
Q:Does homeowners insurance cover a whole house generator?
Some policies partially cover damage to an installed unit, and a handful of insurers offer a small discount for having one. Coverage details vary a lot by carrier, so confirm the specifics with yours before you install.
Q:How long does a whole house generator last?
With routine maintenance, most standby generators run reliably for 15 to 25 years, though the engine and battery typically need service or replacement well before the whole unit is retired.