Across 118 permits filed since 2025-05-03, the median is $9,317; half of projects fall between $5,000 and $15,191. 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 Middlesex County, CT actually reported when they pulled permits.
Recent filings
- *Install Propane boiler and gas lineTown of Westbrook · 2026-10-29$15,592
- *We propose to supply the labor and materials to replace the gas furnace at the above address. The following will be supplied: American Standard 60,000 BTU 95% AFUE Natural Gas FurnaceTown of Westbrook · 2026-10-29$6,200
- Installation of baseboard heati with gas boilerHaddam · 2026-10-20$7,000
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 Middlesex County, CT came in between $5,000 and $15,191. 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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