How much does whole house generator installation typically cost?

Whole-house generator installation cost varies by generator size, fuel type (natural gas or LP), and the scope of electrical and gas work. Parrish Services provides free estimates for generator installations in Northern Virginia. A technician will confirm final costs after assessing load needs, site prep, pad, transfer switch options, and any utility coordination. Parrish is a turnkey, licensed contractor that pulls permits, schedules inspections, and coordinates gas meter upgrades or utility power drops when required. Service is available across Northern Virginia, including Reston and McLean. <br/> Updated: 2025-12-31 <br/> Need help in Remington, VA? Call (571)-650-1016 or book online. "The tech that came out, Doug B, was phenomenal!" — Matt H.