Generator Installation Cost: Pricing Guide for Electricians
Electricians should charge $3,000–$6,000 for a whole-house standby generator installation including the transfer switch, electrical connections, and labor (generator unit not included). Portable generator interlock or manual transfer switch installations run $500–$1,500. The generator unit itself (Generac, Kohler, or Briggs & Stratton) costs $3,000–$15,000 depending on size.
Generator installations are high-ticket jobs that spike after every major storm and power outage — but savvy electricians market them year-round. With climate-related power disruptions increasing, homeowners are willing to invest $5,000–$20,000+ for reliable backup power. The electrical portion of a standby generator installation is your bread and butter, while portable generator setups offer a budget-friendly entry point for price-sensitive customers.
Types of Generator Installations
There are three main categories of generator work. First, manual transfer switch or interlock kit installations for portable generators — these are quick jobs ($500–$1,500) that let homeowners safely connect a portable generator to selected circuits. Second, automatic transfer switch (ATS) installations with a standby generator — these monitor utility power and automatically start the generator during an outage. Third, whole-house standby systems with integrated load management that can power an entire home. Each has different material and labor requirements. Interlock kits (like the GenInterlock brand at $50–$150) are the simplest — you install the interlock on the panel and a generator inlet box on the exterior. Manual transfer switches (Reliance Controls or Generac at $200–$400) are a step up with dedicated circuits. Automatic transfer switches (Generac, Eaton, or Kohler at $500–$1,500) are the most complex electrical component.
Standby Generator Electrical Work
The electrical scope for a whole-house standby generator includes installing the automatic transfer switch at the main panel, running power and control wiring from the ATS to the generator location, and connecting the generator to a dedicated circuit for the battery charger and controller. The ATS typically mounts adjacent to the main electrical panel — you will need to reroute the utility service entrance cable through the ATS before it reaches the panel. This is the most complex part of the installation and requires a utility disconnect. Wire runs from the ATS to the generator pad typically use 6/3 or 4/3 SER cable ($4–$7 per foot) in conduit. Most installations require 30–60 feet of wire run. Budget $800–$1,500 for the transfer switch and electrical materials. Your labor on the electrical portion runs 8–14 hours depending on the panel configuration and wire routing complexity.
Portable Generator Connection Pricing
Portable generator connections are excellent quick-turn jobs. An interlock kit installation takes 2–3 hours: install the interlock device on the panel cover ($50–$150 for the kit), install a NEMA L14-30 or L14-20 generator inlet box on the exterior wall ($30–$60), and run 10/4 or 10/3 cable from the inlet to a backfeed breaker in the panel ($50–$100 for wire and breaker). Total materials run $150–$300, and you should charge $500–$900 for the complete installation. Manual transfer switches with 6–10 pre-selected circuits take 3–5 hours and run $700–$1,500 installed. These jobs have great margins — 55–65% gross — and often lead to standby generator upsells when the homeowner gets tired of manually connecting during outages.
Coordinating with Other Trades
Standby generator installations require coordination with other trades unless you handle everything in-house. Gas line connection from the meter to the generator requires a licensed plumber or gas fitter ($500–$1,500 depending on the run distance). The generator pad needs a level concrete pad or gravel base with composite pads (GenPad at $200–$400 or poured concrete at $300–$800). Some electricians develop relationships with plumbers and concrete contractors to offer a turnkey package, which increases your total project value and simplifies the process for the homeowner. If you coordinate subcontractors, add a 15–20% markup on their work for your project management. Utility coordination is also necessary — you will need a disconnect for the ATS installation and a reconnect after inspection.
Generator Sizing and Consultation Value
Proper generator sizing requires calculating the home's essential loads. A load calculation is part of your value as an electrician — never let the homeowner or a generator salesperson dictate the size without your input. For whole-house backup, size the generator at 80% of the main panel amperage: a 200A panel needs a 22kW–24kW generator, and a 100A panel needs a 12kW–14kW unit. For essential-loads-only backup (common for budget-conscious clients), you can often recommend a 10kW–14kW unit with load shedding. Generac Guardian (16kW–24kW at $4,000–$7,000), Kohler (14kW–20kW at $5,000–$9,000), and Briggs & Stratton (10kW–20kW at $3,500–$6,000) are the major residential brands. Offering a paid sizing consultation ($150–$250) that is credited toward the installation helps qualify serious buyers and reduces tire-kicker site visits.
Building Your Generator Installation Pricing
Structure your generator installation pricing in clear tiers. A portable generator connection package (interlock + inlet) at $500–$900 is your entry-level offering. A standby generator electrical installation (ATS + wiring, generator not included) at $3,000–$6,000 is your core offering. A turnkey package including generator, ATS, electrical, gas line, and pad at $8,000–$20,000 is the premium option. For turnkey packages, your margin on the generator unit is typically 15–25% over wholesale, while your margin on the electrical work should be 45–55%. Maintenance contracts ($150–$300 annually for inspection and testing) add recurring revenue. After a major storm, you can raise prices 10–20% — demand-based pricing is standard in the generator market and customers expect it.
Frequently Asked Questions
The electrical portion takes 1–2 days. The complete installation including concrete pad, generator placement, gas line, and electrical typically takes 2–4 days across multiple trades. Add 1–2 weeks for permit processing and utility coordination. From signed contract to operational generator, plan 2–4 weeks for most residential installations.
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