Across 1,457 permits filed since 2025-05-08, the median is $10,000; half of projects fall between $5,000 and $15,000. 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 Hartford County, CT actually reported when they pulled permits.
Recent filings
- ****MARK IS ASSIGNED TO THIS**** Quoted Installation #59156 Furnace and ductwork replacement Installation of a new oil furnace with new oil burner. Includes reconnection of oil piping. Ductwork connections with minor modifications. ElecTown of Southington · 2026-11-06$12,000
- ****DAVE IS ASSIGNED TO THIS**** Emergency Replacement: We will replace existing furnace with (1) Am Std S9X2B060U4PSBA, 96% efficient, DV Sealed combustion, 2-stage gas furnace in enclosed sealed pan Net BTU/Capacity: h 57K/60K CA fee iTown of Southington · 2026-11-06$7,000
- ****DAVE IS ASSIGNED TO THIS**** Emergency Replacement: We will replace existing furnace with (1) Am Std # S9V2B060, 96% efficient, 2-stage gas fired direct vent sealed combustion furnace with HSI 2-stage gas burner, VS blower motor and Town of Southington · 2026-11-06$13,500
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 Hartford County, CT came in between $5,000 and $15,000. 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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