Across 303 permits filed since 2025-05-02, the median is $10,000; half of projects fall between $5,746 and $15,149. 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 New London County, CT actually reported when they pulled permits.
Recent filings
- Install 1 DX system for dehumidifaction and heat/cool .Install 1 Viessman condensing boiler for radiant heat / hot water and reheat for dehumidiferTown of Waterford · 2026-10-29$103,340
- Remove and replace the existing boiler in the exact same location and footprint as original with new Crown brand TWB100 boiler, flue pipe and controls.Groton · 2026-10-28$16,000
- REPLACE OIL FIRED BOILER WITH TANKLESS COIL, 2 ZONE. EXISTING HYDRONIC BASEBOARDTown of Waterford · 2026-10-28$6,800
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 New London County, CT came in between $5,746 and $15,149. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.
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