Across 922 permits filed since 2025-01-25, the median is $26,750; half of projects fall between $10,000 and $70,000. 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 Kings County (Brooklyn), NY actually reported when they pulled permits.
Recent filings
- Replcace gas furnace at cellar, No change to use egress or occupancy.Brooklyn · 2026-07-24$4,000
- GENERAL RENOVATION OF 2-FAMILY HOUSE WITH RELOCATED/REPLACE/NEW PLUMBING FIXTURES AND BOILER AND H.W.H. AS PER PLAN. NO CHANGE IN USE, EGRESS OR OCCUPANCY.Brooklyn · 2026-07-23$48,000
- SUPERSEDE LAA JOB #300896608; INSTALL NEW (1)BOILER AND (1)HOT WATER HEATERON CELLAR AS PER PLAN; NO CHANGE IN USE, EGRESS OR OCCUPANCY UNDER THISAPPLICATION.Brooklyn · 2026-07-23$10,000
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 boiler / water heater permits in Kings County (Brooklyn), NY came in between $10,000 and $70,000. 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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