Most residential standby generator installations take 6–8 hours from start to finish, though the total project timeline typically spans 2–3 weeks when accounting for permitting and inspections. The installation day itself involves multiple coordinated steps: preparing the concrete foundation pad, running natural gas lines, installing the automatic transfer switch, and establishing all electrical connections to your home's main panel and utility meter.
The concrete foundation is the first critical step and usually requires 2–3 hours to complete properly. Our team excavates the designated area, sets forms, pours concrete mix rated for your generator's weight specifications, and allows adequate curing time before equipment placement. For a typical 20–24 kW Generac unit—the most common residential size—the pad dimensions are usually 4 feet by 4 feet, set slightly above grade to prevent water pooling during heavy rain.
Natural gas line installation follows, connecting your home's existing gas supply (or running a new line from the meter) to the generator's fuel inlet. This step requires precision and pressure testing to ensure zero leaks. We use industry-standard fittings and comply with all local codes, which vary by jurisdiction. In most areas, gas connections must be inspected and certified before the system becomes operational.
The automatic transfer switch is the brain of your backup system. This component detects a utility outage, signals the generator to start, and automatically transfers your home's electrical load from the grid to the generator within seconds—typically 10–15 seconds. Installation involves mounting the switch near your main electrical panel, running conduit and wiring, and programming transfer priorities to protect critical circuits. This ensures that essential systems like HVAC, refrigeration, and medical equipment stay powered during outages.
Electrical connections are the final major component. Our licensed technicians (MPL-38162) run properly sized copper conductors from the generator to the transfer switch and main panel, ensuring compliance with the National Electrical Code (NEC). Grounding and bonding are critical safety measures that prevent electrical shock hazards.
Before your system goes live, local building and electrical inspectors must approve the installation. This permitting process typically takes 1–2 weeks and is coordinated by our team. We handle all paperwork, schedule inspections, and notify your utility company as required. Some municipalities require a pre-installation inspection of your gas and electrical infrastructure before we begin work.
Weather can extend timelines slightly—pouring concrete in rain or extreme heat requires rescheduling. We stock all installation materials on our service vehicles, including concrete mix, gas fittings, electrical components, and specialty tools, minimizing delays from supply chain issues.
Blackmon Plumbing is an 18-year industry veteran and authorized Generac dealer providing complete backup generator installation and maintenance throughout the region.