Across 103 permits filed since 2025-03-13, the median is $5,000; half of projects fall between $1,950 and $10,500. Figures are permit valuations reported to building departments. National cost guides answer this question with averages from other markets; these numbers are what homeowners in New London County, CT actually reported when they pulled permits.
Recent filings
- The generator will be connected to 2 new 120 gal LP tanks. New gas piping will be installed from the tank to the generator, sized per manufacturer requirements and fuel load calculations. All gas piping, shutoff valves, sediment traps, presMontville · 2026-09-11$2,000
- The 18 KW Generator will be permanently installed on an exterior concrete or composite pad in accordance with manufacturer specifications and local code requirements. A 200-amp automatic transfer switch will be installed between the existinMontville · 2026-09-11$10,000
- The installation of 2/120 gallon Quality owned propane tanks and the gas piping to the generator.Groton · 2026-09-10$2,721
How to read these numbers
Permit valuations are the project cost the applicant reports to the building department. They skew slightly low — nobody rounds up for the permit fee — and scope varies, so the middle-half range is the honest picture: half of all standby generator permits in New London County, CT came in between $1,950 and $10,500. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
Same project, other places
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