Across 289 permits filed since 2025-03-03, the median is $8,000; half of projects fall between $2,800 and $14,000. 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
- REPLACE TWO (2) BOILERSRockville Centre · 2026-08-31$2,000
- REPLACING BOILER **INSTALLATION MUST COMPLY WITH THE 2025 NYS BUILDING & MECHANICAL CODE** **FINAL ELECTRICAL CERTIFICATE REQUIRED**City of Long Beach · 2026-08-31$243,610
- Residential Heating - direct replacement gas fired water heaterVillage of Garden City · 2026-08-26$2,800
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 boiler / water heater permits in Nassau County, NY came in between $2,800 and $14,000. 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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