Average install costs (not including the generator) range from $5,000 - $10,000. Generac offers an in-home consultation program that connects homeowners with certified dealers who are experienced in identifying and assessing these factors. You might be surprised at how affordable powerful generators can be. . Quick answer: In 2025, a typical whole house generator installation costs $6,000–$30,000, driven by generator size (kW), brand, transfer switch, electrical upgrades, fuel line/permits, and local labor rates. This guide presents clear price ranges and practical drivers to help budget accurately and avoid surprises. Portable generators are the least expensive, while whole-home standby generators are the most expensive due to permanent installation and automatic operation.