Across 89 permits filed since 2025-01-25, the median is $8,500; 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 Middlesex County, CT actually reported when they pulled permits.
Recent filings
- Plumbing for 3 bathrooms, gas piping to furnace and water heatersHIGGANUM · 2026-07-23$28,000
- Replace oil fired water heaterHADDAM NECK · 2026-07-23$5,500
- *Installation of 119 gallon LP Rinnai Demand Duo CHS199100HIP Water Heater in basement. Vent appliance through mechanical room and terminate using same vent locations as existing tankless water heater that is to be removed. Gas piping by WiTown of Westbrook · 2026-07-14$8,500
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 Middlesex 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.
Same project, other places
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