Across 43 permits filed since 2025-01-25, the median is $18,000; half of projects fall between $10,000 and $77,800. 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
- INSTALLATION OF AN INGROUND POOL AND SPA, MASONRY TERRACE, DECK, POOL ENCLOSURE FENCING AND 4' MAX HEIGHT BOULDER WALLKINGS POINT · 2026-07-22$100,000
- Construct a 4,103 sq. ft. 2 story replacement dwelling, with 89 sq. ft. front portico, and 295 sq. ft. covered patio at the rear (demolish existing 2,100 sq. ft. 2 - story dwelling, exclusive of foundation and first floor deck, and 462 sq. …Village of Garden City · 2026-07-10$600,000
- PROPOSED DECK, STEPS, FENCE, OUTDOOR KITCHEN, WALKWAY AND DRIVEWAY EXPANSIONKINGS POINT · 2026-07-07$125,000
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 deck permits in Nassau County, NY came in between $10,000 and $77,800. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.