Across 112 permits filed since 2025-01-25, the median is $25,000; half of projects fall between $15,069 and $85,000. 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 Norwalk, CT actually reported when they pulled permits.
Recent filings
- REMOVAL OF EXISTING STRUCTURE ABOVE FIRST FLOOR DECKING, EXISTING FOUNDATION TO REMAIN.City of Norwalk · 2026-07-21$10,000
- SECOND FLOOR ADDITION, RE BUILD REAR DECK & REGRADE AT FRONTCity of Norwalk · 2026-07-09$185,000
- 1 STORY REAR ADDITION TO EXPAND KITCHEN, NEW DECK, REMOVE LOAD BEARING WALL.City of Norwalk · 2026-07-09$50,000
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 deck permits in Norwalk, CT came in between $15,069 and $85,000. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.