Across 1,921 permits filed since 2025-01-25, the median is $15,171; half of projects fall between $7,700 and $29,000. 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 Connecticut actually reported when they pulled permits.
Recent filings
- 3 SEASON PORCHES Enclose the 6 rear porches on Building 502 with 2x6 walls and windows. Close off existing rear man door and access will be from the existing 5-foot sliding doors. The existing structural frame is to remain. plans are staCity of New Haven · 2026-07-25$36,000
- Remove and replace windows. No structural change. Replacement in-kind like like. ARC approved Jackie 7/24/2026.Town of Greenwich · 2026-07-24$2,829
- Siding and windows (Work previously done).Town of Greenwich · 2026-07-24$20,000
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 Connecticut came in between $7,700 and $29,000. 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
Window replacement in New YorkWindow replacement on Long Island