Across 42 permits filed since 2025-03-03, the median is $32,378; half of projects fall between $19,384 and $48,806. 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
- Siding replacement – no alterations – remove old siding, Tyvek, and insulation ½” – install cedar impressions & double vinyl siding w/accessories – J channel, aluminum coil, AZEK trim on doorCity of Norwalk · 2026-08-24$32,000
- REMOVE AND REPLACE EXISTING SIDING WITH CERTAINTEED MONOGRAM 4" VINYL SIDING WITH 1/4" FANFOLD INSULATIONCity of Norwalk · 2026-08-06$49,613
- INSTALL VINYL SIDING WITH APPLICABLE ACCESSORIES AND UNDER ALIGNMENTSCity of Norwalk · 2026-08-04$47,922
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 siding permits in Norwalk, CT came in between $19,384 and $48,806. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.