Across 752 permits filed since 2025-01-28, the median is $43,840; half of projects fall between $17,375 and $110,000. 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 New York County (Manhattan), NY actually reported when they pulled permits.
Recent filings
- THE PROPOSED WORK INCLUDES EXTENSION OF EXISTING AIRDUCTS WITH INSULATED DUCTS & INSTALLATION OF NEW EXHAUSTIN THE TOILET AS PER PLANS FILED HEREIWTH.Manhattan · 2026-07-27$14,500
- additions/modifications to sprinkler system, no change in use egress or occupancyManhattan · 2026-07-24$144,000
- additions /modifications to existing mechanical systems on 13th and 14th floor as per plans filed herewith. No change in use, egress or occupancy.Manhattan · 2026-07-24$711,000
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 home addition permits in New York County (Manhattan), NY came in between $17,375 and $110,000. 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
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