How much does a whole house generator cost installed?
A standby whole-house generator typically costs $5,000–$18,000 installed. The generator is $3,000–$12,000 depending on size; the rest is the transfer switch, electrical, gas hook-up and pad.
Ranges are typical planning guides — actual price varies by region, access, materials and your local pro. Always get a written quote.
| Item | Typical cost | Notes |
|---|---|---|
| Generator unit (10–26 kW) | $3,000–$12,000 | Size to your home's load |
| Automatic transfer switch | $400–$1,500 | Switches to backup power |
| Electrical + gas connection | $1,500–$5,000 | Wiring, gas line, pad |
| Permit & inspection | $100–$500 | Usually required |
What affects the price
Generator size (kW)
Backing up the whole house needs a bigger, pricier unit than running just essentials. Sizing to your load is the main cost lever.
Fuel & gas line
Running or upgrading a natural gas or propane line adds cost, especially over distance.
Transfer switch & panel
An automatic transfer switch and any panel work are required for safe, hands-off backup.
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How much is a whole house generator installed?
Typically $5,000–$18,000 all-in — the unit is $3,000–$12,000 and installation (transfer switch, electrical, gas, pad) is the rest.
What size generator do I need for a whole house?
Most homes need 18–26 kW to run everything, or 10–14 kW for essentials only. An electrician sizes it to your actual load.