Prices updated 2025
How Much Does a Whole House Generator Cost?
Standby generator prices by size. Installation, fuel type, and what size you need.
Whole House Generator Prices
| Size | Generator | Installation | Total | Powers |
|---|---|---|---|---|
| 10–12 kW | $2,500–4,500 | $3,000–5,000 | $5,500–9,500 | Essential circuits only |
| 16–20 kW | $4,000–6,000 | $4,000–6,000 | $8,000–12,000 | Most popular. Average home. |
| 22–26 kW | $5,000–8,000 | $5,000–8,000 | $10,000–16,000 | Large home, all circuits |
| 40–60 kW | $10,000–20,000 | $5,000–10,000 | $15,000–30,000 | Estate / commercial |
Average installation: $8,000–12,000
A 20kW Generac or Kohler generator with automatic transfer switch, concrete pad, and gas line connection. Turns on automatically within 10 seconds of a power outage.