Across 333 permits filed since 2025-05-06, 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 on Long Island 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 on Long Island 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 Connecticut