Pricing reviewed October 2026
How much does a whole-house generator cost?
A whole-house generator costs $6,000 to $25,000 installed, with most homeowners paying $10,000 to $15,000. The unit runs $3,000–$6,000 and installation labor $3,000–$5,000.
| Home need | Generator size | Installed cost |
|---|---|---|
| Essentials only | 10–14 kW | $6,000 – $10,000 |
| Most homes | 18–26 kW | $10,000 – $15,000 |
| Large / all-electric homes | 26+ kW | $15,000 – $25,000 |
Calculator add-ons (editorial estimates)
| Option | Added cost |
|---|---|
| Propane tank and line | $1,500 – $3,500 |
| Gas line work (natural gas) | $0 – $800 |
| Whole-home / load management switch | $800 – $2,000 |
| Poured concrete pad | $300 – $800 |
How to estimate generator cost
- Size the generator.
- Choose fuel.
- Pick a transfer switch.
- Add site work.
- Adjust for location and compare quotes.
Not sure what size you need? Use the generator sizing calculator · Choosing a brand? Read Kohler vs. Generac.
Compare free generator installation quotes →
Frequently asked questions
How much does a whole-house generator cost?
A whole-house generator costs $6,000 to $25,000 installed, typically $10,000 to $15,000.
How much does generator installation cost?
Installation labor typically runs $3,000 to $5,000 on top of a $3,000–$6,000 unit.
What size generator do I need?
Essentials need 10–14 kW; most homes 18–26 kW; large or all-electric homes 26 kW or more.
How much does a 22 kW generator cost installed?
A 22 kW unit falls in the 18–26 kW tier, typically $10,000 to $15,000 installed.
Is propane or natural gas cheaper?
Natural gas is usually cheaper to install if a line exists; propane requires a tank, adding roughly $1,500–$3,500 (editorial estimate).
Should I buy Kohler or Generac?
Generac is the practical default for most homes; Kohler suits buyers prioritizing durability. See our Kohler vs. Generac comparison.
How accurate is this calculator?
It provides a planning range; permits, electrical panel upgrades, distance to the gas meter and local labor change real quotes.
Generator figures marked as from the 2026 cost guide (whole-house generator $6,000–$25,000 installed, typically $10,000–$15,000; unit $3,000–$6,000; installation $3,000–$5,000; 10–14 kW $6k–$10k, 18–26 kW $10k–$15k, 26+ kW $15k–$25k) come from the HomeGeneratorCost 2026 guide. Add-on ranges, load wattages and city factors are editorial estimates. Get written quotes from licensed installers.