Across 1,242 permits filed since 2025-01-25, the median is $10,000; half of projects fall between $4,346 and $17,463. 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 Fairfield County, CT actually reported when they pulled permits.
Recent filings
- Installation of replacement chimney vented gas water heaterFairfield · 2026-07-23$3,000
- EMERGENCY REPLACEMENT OF AN RHEEM 40 GALLON 6 YEAR GAS WATER HEATER MODEL # XG40T06HE36U0Fairfield · 2026-07-23$1,010
- Install 3 new gas lines for 3 new stoves and 3 new gas lines for 3 new boilers - install 3 new Navien combi boilers and baseboard heatCity of Norwalk · 2026-07-22$40,000
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 Fairfield County, CT came in between $4,346 and $17,463. 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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