Across 49 permits filed since 2025-01-25, the median is $20,000; half of projects fall between $5,500 and $80,000. 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 Yonkers, NY actually reported when they pulled permits.
Recent filings
- CONSTRUCT A SECOND-FLOOR ADDITION AND ALTERATIONS TO AN EXISTING ONE-FAMILY DWELLING AS SHOWN ON THE SUBMITTED PLANS WITH THE CONDITIONS LISTED BELOWCity of Yonkers · 2026-07-21$150,000
- PROPOSED ALTERATIONS AND ADDITION TO CONVERT EXISTING ONE FAMILY TO A TWO FAMILYCity of Yonkers · 2026-07-20$200,000
- Wiring of single family house to include additionCity of Yonkers · 2026-07-17$28,000
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 Yonkers, NY came in between $5,500 and $80,000. 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
Home addition in New YorkHome addition in ConnecticutHome addition on Long Island