How much does a whole-house generator cost installed?
Whole-house generator installation runs $4,500 for a small 10kW unit with limited transfer switch, $9,500 for a typical 18–22kW automatic standby with concrete pad, and $18,000+ for 26kW+ units with full electrical and gas-line work.
Quick price points (2026)
| Scope | Cost | What it includes |
|---|---|---|
| Low | $4,500 | installed |
| Typical | $9,500 | installed |
| High | $18,000 | installed |
How to budget for this project
- Get 3 quotes
Get itemized quotes from at least three licensed contractors in your area.
- Adjust for your region
Compare the same scope and account for regional labor and permitting.
- Add 10–15% contingency
Hidden conditions, code upgrades and permit fees can increase the original quote.
- Plan the cash, not the financing
Build the replacement cost into the home's repair plan before the work becomes an emergency.