Across 5,369 permits filed since 2025-05-04, the median is $9,987; half of projects fall between $4,300 and $15,758. 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 Connecticut actually reported when they pulled permits.
Recent filings
- Replace existing boiler with new Burnham gas-fired boiler.Westport · 2026-11-02$16,223
- Replacement - Install Regal Boyertown 105 K BTU Oil Furnace # RSM605ECMGuilford · 2026-10-30$9,467
- ****MARGARET IS ASSIGNED TO THIS **** A.O. Smith GPVT 201 50 gallon propane water heater and gas valve replacement CA fee includedTown of Southington · 2026-10-30$5,692
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 Connecticut came in between $4,300 and $15,758. 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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