Do generators contractors need to be licensed?

Licensing requirements vary by state. In most states, generators contractors must hold a state license. Always verify the license number with your state's licensing board before work begins.

How many estimates should I get?

Get at least three written estimates for any project over $1,000. Compare line by line — not just the bottom line — to ensure you're comparing equivalent scopes of work.

What should be in the contract?

A written contract should include: full scope of work, materials specified by brand and grade, timeline with start and completion dates, payment schedule tied to milestones, workmanship warranty terms, and a change order process.

How to Hire a Generators Contractor

Updated March 2026

Whole-home standby generators automatically provide backup power during outages, protecting against food spoilage, frozen pipes, sump pump failure, and loss of medical equipment. Natural gas or propane-fueled standby generators (typically 12–24 kW for residential use) start within seconds of a power outage via an automatic transfer switch. Installation involves an electrical subpanel or whole-house transfer switch, a concrete pad, gas line connection, and compliance with setback and noise ordinances. Portable generators serve as a lower-cost option for partial backup but require manual setup and fuel management.

Typical cost

$5,000 – $18,000per system

Portable generator: $500–$2,000. Standby 12 kW: $5,000–$8,000 installed. Standby 22 kW: $8,000–$15,000 installed. Transfer switch adds $500–$1,500 if not included.

Hiring checklist

1Ask the installer to perform a load calculation to properly size the generator for your home.
2Confirm the estimate includes the transfer switch, concrete pad, gas line, and all permits.
3Ask about warranty terms — most major brands offer 5-year limited warranties.
4Verify the installer is authorized by the generator manufacturer (Generac, Kohler, Briggs & Stratton).

Frequently asked questions

How much does a generators contractor charge?
Typical generators costs range from $5,000 to $18,000 per system. Portable generator: $500–$2,000. Standby 12 kW: $5,000–$8,000 installed. Standby 22 kW: $8,000–$15,000 installed. Transfer switch adds $500–$1,500 if not included.
Do generators contractors need to be licensed?
Licensing requirements vary by state. In most states, generators contractors must hold a state license. Always verify the license number with your state's licensing board before work begins.
How many estimates should I get?
Get at least three written estimates for any project over $1,000. Compare line by line — not just the bottom line — to ensure you're comparing equivalent scopes of work.
What should be in the contract?
A written contract should include: full scope of work, materials specified by brand and grade, timeline with start and completion dates, payment schedule tied to milestones, workmanship warranty terms, and a change order process.

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