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

A home standby generator installation cost is finalized after an on-site assessment because the price depends on equipment size, fuel setup, and the scope of electrical and gas work required. The biggest driver is the generator’s power capacity, which determines both the unit cost and the installation complexity.

As a licensed plumbing and electrical contractor, Parrish pulls permits, coordinates inspections, and manages the entire install so you don’t juggle multiple subs. We regularly handle permitting and utility coordination for Northern Virginia homes near Great Falls. Financing options are available for installations, and a $300 off promotion applies to qualifying replacement/installation invoices of $6,000 and up.

What typically affects your final price:

• Generator kW and desired coverage (partial circuits vs whole-house)
• Gas piping length/size, meter upgrades, or propane tank setup
• Transfer switch type and any panel or wiring changes
• Site prep, concrete pad, trenching, and required permits/inspections

Schedule a site visit to size the system correctly and verify gas and electrical needs before you decide.

Updated: 2026-03-13

Need help in Great Falls, VA? Call (571)-650-1016 or book online. "Great response and generator back working just in time for freezing temperatures" — Curt H.