Across 634 permits filed since 2025-04-28, the median is $19,676; half of projects fall between $10,000 and $40,000. 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
- Renovate existing deck and stairs. Conditions: -Openings in stair risers cannot be more than 4 inches -Provide code compliant graspable handrails at both sets of stairs.Mount Kisco Village · 2026-10-27$4,750
- Construct a pre-fab sunroom on existing rear yard wood deck.White Plains · 2026-10-26$90,980
- INSTALL DECK ATTACHED TO HOUSE.Town of Eastchester · 2026-10-26$7,000
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 deck permits in Westchester County, NY came in between $10,000 and $40,000. 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
Deck in New JerseyDeck in New YorkDeck in ConnecticutDeck on Long Island