Across 548 permits filed since 2025-03-09, the median is $19,712; half of projects fall between $10,000 and $45,000. 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 Westchester County, NY actually reported when they pulled permits.
Recent filings
- Remove and replace 31 windows. No structural work. **Needs contractors updated liability insurance before releasing permit**Village of Mamaroneck · 2026-09-04$39,950
- REPLACE (4) Windows and (1) door to existing one family dwelling part of condominiumTown of Somers · 2026-09-03$15,000
- Install (8) direct replacement windows on the second floor.Village of Sleepy Hollow · 2026-09-03$10,500
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 Westchester County, NY came in between $10,000 and $45,000. 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 in ConnecticutWindow replacement on Long Island