Across 168 permits filed since 2025-04-24, the median is $10,000; half of projects fall between $5,000 and $236,350. 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 Putnam County, NY actually reported when they pulled permits.
Recent filings
- Construction of a four-bedroom, four full-bathroom, two half-bathroom single-family dwelling with a finished basement and three-car attached garage with unfinished storage aboveTown of Patterson · 2026-10-08$800,000
- Retain Finished Basement and 2nd Floor OfficeTown of Carmel · 2026-10-07$13,000
- Retain Finished Basement with Full Bath, Summer Kitchen and Rec RoomTown of Carmel · 2026-10-01$15,000
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 basement finishing permits in Putnam County, NY came in between $5,000 and $236,350. 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
Basement finishing in New YorkBasement finishing in ConnecticutBasement finishing on Long Island