Across 410 permits filed since 2025-03-11, the median is $50,387; half of projects fall between $12,125 and $180,719. 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
- Addition and house renovationNew Rochelle · 2026-09-08$14,000
- Garage addition with bathroom: 1st flr cabana & 2nd flr gym; and main house reno/addition to add sunroom, expand kitchen, and add covered porch.Town of Bedford · 2026-09-04$510,000
- New garage and driveway extensionTown of North Castle · 2026-09-03$34,870
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 home addition permits in Westchester County, NY came in between $12,125 and $180,719. 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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