Across 291 permits filed since 2025-04-30, the median is $12,755; half of projects fall between $6,704 and $23,097. 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
- Removal and replacement of 2 living room windows - no structural changesGroton · 2026-10-29$5,898
- Replacement of (7) double hung windows, no structural changes.Groton · 2026-10-29$17,394
- Install three vinyl replacement double hung windows and one 23 in round window. All of the windows will be installed in existing openings.Town of Waterford · 2026-10-29$5,000
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 $6,704 and $23,097. 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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