How much does it cost to install a standby generator at home?

Installing a home standby generator is a customized project, so final cost is confirmed after an on-site assessment by Diamond Heating, Cooling, Plumbing & Electric. The biggest driver is generator size (kilowatts), because larger units demand more electrical capacity and fuel supply. Total price also depends on equipment choices and installation complexity at your home; professional installation protects warranties and ensures code compliance. We install many systems across the Boise–Treasure Valley region and present clear, itemized proposals. A right-sized unit often costs less overall than an oversized model that forces extra electrical or gas work. Seasonal offers may include $100 off Generac yearly maintenance or a free whole-home safety inspection with a new generator install; ask about current availability.

Key items that influence your quote:

• Required wattage to cover essentials versus whole-home
• Fuel source and any line work (natural gas, propane, tank location)
• Transfer switch type and load management strategy
• Site work and permitting (concrete pad, trenching, distance to meter/panel)

Schedule a professional sizing visit to receive a firm, written quote for your home.

Updated: 2026-03-11

Need help in Star, ID? Call (208) 378-6624 or book online.