Across 333 permits filed since 2025-05-04, the median is $14,320; half of projects fall between $8,500 and $25,000. 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 Nassau County, NY actually reported when they pulled permits.
Recent filings
- The construction of a 13 x 21.2 (oa) (276 sf) roof over poured concrete patio attached to existing detached garage. 72 sf of raised masonry outdoor countertop as per plans prepared by John R. Bracco R.A. 8/12/26. *No plumbing filed under tVillage of Mineola · 2026-10-29$12,456
- New flat roof and skylights replacementVillage of Great Neck · 2026-10-29$8,500
- DIRECT REPLACEMENT OF ROOF **NUMBER OF LAYERS OF ROOFING NOT TO EXCEED TWO**City of Long Beach · 2026-10-27$14,850
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 roof replacement permits in Nassau County, NY came in between $8,500 and $25,000. 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
Roof replacement in New JerseyRoof replacement in New YorkRoof replacement in ConnecticutRoof replacement on Long Island