ELECTRICAL
How to Estimate a Standby Generator
Contractor method to estimate a standby generator by power, fuel, transfer switch, installation and labor with clear materials and labor lines.
A standby generator is a big-ticket install because it bundles the generator, the transfer switch and the electrical work. Power size, fuel type and the install labor set the price. This guide covers sizing the unit, choosing the fuel, and quoting the transfer switch and install.
THE SHORT ANSWER
How to Estimate a Standby Generator
A 22 kW natural gas unit with transfer switch, installation and 24 labor hours at $85 totals about $13,140.
Size the generator to the loads
Price by the kilowatt size you need to carry the essential circuits. Sizing too small means it trips; too big means wasted cost.
- Generator size
- Fuel type
- Transfer switch
- Installation
Fuel type changes cost and install
Natural gas, propane and diesel units price and install differently. Confirm the fuel available at the site before you quote.
The transfer switch is required
A standby generator needs an automatic transfer switch to power the panel safely. This is a required line, not an option.
Electrical and permitting
The install connects to the panel and needs a permit and inspection in most areas. Confirm local requirements and include the electrical labor.