How much does a whole-house generator really cost?
Most homes pay $8,000–$15,000 installed for a 14–26 kW standby system in 2026. Here's exactly what that buys, what moves the number, and how to size it right the first time.
Three steps to a fair price
Size it
Tick what you need running during an outage. Get a kW recommendation using the same method installers use — in about a minute.
Sizing calculator →See the real cost
Unit, transfer switch, electrical, gas line, permits, labor — every line with a low and a high, so no quote can hide anything.
Cost breakdown →Compare installer quotes
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Get quotes →Guides
All guides →Generator Permits and Placement: What Inspectors Check
Which permits a standby generator needs, what they cost, how far from windows and the house it must sit, and what the inspector actually checks.
Read → InstallersHow to Choose a Generator Installer: 12 Questions to Ask
Twelve questions that separate an installer who has done a hundred standby generators from one learning on your house, with the answers you should hear.
Read → FuelNatural Gas vs Propane Standby Generator: Which Fuel?
Natural gas runs cheaper and never needs refilling; propane works anywhere. How the fuel choice changes install cost, runtime and reliability.
Read →Tools
What size generator do I need?
Running watts, starting surge and headroom, done for you. Recommends a standby size.
Open calculator → By stateCost where you live
Local electrician wages, permit fees and how often your grid actually goes down.
Browse states → ChecklistWhat a good quote itemises
Eight lines every written quote should separate — and the one that's usually missing.
See the list →Get installed-price quotes from licensed local installers
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