Across 1,782 permits filed since 2025-05-02, the median is $10,458; half of projects fall between $4,500 and $18,000. 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 Fairfield County, CT actually reported when they pulled permits.
Recent filings
- 50 gallon hot water heater, 1 toilet, 1 sink, 1 kitchen sink, 1 gas line to fireplace, 1 shower, 1 bar sinkCity of Norwalk · 2026-10-30$12,000
- REMOVE & DISCARD EXISTING BOILER - SUPPLY AND INSTALL NEW NAVIEN NFB200H HIGH EFFIECIENCY BOILER - RUN NEW INTERIOR GAS PIPE FOR NEW BOILERCity of Norwalk · 2026-10-30$15,000
- INSTALLATION OF ONE 9N/G 95% PLUS) GAS FURNACE 120K BTU, INSTALLATION IN POOL AREA (ONLY HEAT)City of Norwalk · 2026-10-30$4,000
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 $4,500 and $18,000. 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
Boiler / water heater in New JerseyBoiler / water heater in New YorkBoiler / water heater in ConnecticutBoiler / water heater on Long Island