Installing a whole‑home standby generator is a multi‑step process that typically spans several days, though the actual on‑site work is usually completed in 1–2 days. Knowing the generator installation process helps you plan and set expectations.
Step 1: Site Assessment and Sizing. Your installer evaluates your home’s electrical panel, fuel source availability, and desired location. They perform a load calculation to determine the correct generator size. For help with sizing, see our generator sizing guide.
Step 2: Permits and Utility Coordination. The installer pulls all necessary permits and coordinates with the utility company and gas company if needed. See our permits and codes guide.
Step 3: Site Preparation. A level concrete pad or prefabricated platform is installed. The generator unit is placed and secured.
Step 4: Electrical and Fuel Connections. The installer connects the generator to your electrical panel via an automatic transfer switch. This switch senses a power outage and automatically transfers your home’s load to the generator. A fuel line (natural gas or propane) is run from your existing supply or a new tank. For fuel decisions, see generator fuel options.
Step 5: Testing and Inspection. The installer tests the entire system—simulating a power outage to confirm the generator starts, the transfer switch works, and power is supplied to your home. A local inspector then verifies code compliance.
Step 6: Walkthrough and Maintenance Orientation. The installer shows you how to operate the generator, check its status, and perform basic maintenance. For ongoing care, see our generator maintenance guide. For what to do if problems arise, see troubleshooting common generator problems.
For a reminder of the different generator types, revisit types of home generators.
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