Across 69 permits filed since 2025-01-25, the median is $3,200; half of projects fall between $1,519 and $10,000. 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 Middlesex County, CT actually reported when they pulled permits.
Recent filings
- set 2-120 gal LP Tanks with gas piping in third party trench and connect to third party generatorHADDAM · 2026-07-07$1,795
- Install a 24kw air cooled generator with 200amp transfer switchHIGGANUM · 2026-07-07$11,000
- Run approximate 50' ug gas main from existing 500ag LP tank to customers new generator, tee off line for future space heaterHIGGANUM · 2026-06-30$1,400
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 Middlesex County, CT came in between $1,519 and $10,000. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
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