A whole house generator costs $6,000 to $11,000 installed on average. Home generators cost $3,000 to $6,000 alone on average. The labor cost to install a whole house generator is $3,000 to $5,000 on average or $5,000 to $12,000+for longer distances or > 20 kW systems. In comparison, portable. Standby generators can power select circuits or a whole home, depending on the generator's size in kilowatts (kW) and circuits in the transfer switch. Whole home natural gas or liquid propane generators cost $2,000 to $6,000 without installation. Whole house diesel generators. Generac generators cost $2,000 to $5,000 for a 7 to 24 kW whole-house unit, plus $3,000 to $5,000for installation. Generac's standby generators turn on automatically during. Standby generator installation costs depend on the size, fuel source, distance from the electrical panel and gas meter, and amount of wiring.
