Across 2,699 permits filed since 2025-04-26, the median is $15,000; half of projects fall between $7,442 and $28,848. 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
- REPAIRS TO SECOND FLOOR AS PER PRINTS SUBMITTED, INCLUDING FOR OVERHEAD DOORS , THREE WINDOWS, TWO DOORS, SHEETROCK, PAINTING, MINOR FRAMING, MECHANICALS, KITCHEN EQUIPMENT, FLOORING, CVP, MISC.Town of Waterford · 2026-10-23$275,241
- In the dining area of the kitchen we are replacing the three window unit with a new nail fin installed unit from Mercury Excelum Inc. U-Factor .30 or better. Your application for a Building Permit has been reviewed for compliance with the 2Simsbury · 2026-10-23$3,500
- We are installing 15 replacement nail fin installation windows through the house, tempered glass in the baths, U-Factor .18 or better. In the basement we are installing 4 insert windows. The front entry will be new from Thermatru. Your applSimsbury · 2026-10-23$32,900
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 $7,442 and $28,848. 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