Across 244 permits filed since 2025-03-12, the median is $11,656; half of projects fall between $6,640 and $22,380. 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
- Replacement and repair of siding and windows that were damaged due to the fire of building 10 (135 Ledgewood Rd)Groton · 2026-09-10$315,107
- 9 Vinyl Replacement WindowsMontville · 2026-09-10$7,465
- Remove and replace 2 windows and 2 doors, same size with no structural change.Montville · 2026-09-10$7,472
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 window replacement permits in New London County, CT came in between $6,640 and $22,380. 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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