Across 154 permits filed since 2025-04-24, the median is $24,194; half of projects fall between $15,017 and $73,500. 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
- Interior reno @ SFR - replace kitchen & 2 bathrooms in existing location, add full bathroom on 2nd floor - new decking and railing existing frame - replace HVAC & hot water (future permit needed for basement)City of Norwalk · 2026-10-19$110,000
- EXPAND EXISTING ATTIC TO CREATE 4TH UNIT KITCHEN, 1 FULL BATHROOM, 2 BEDROOMS, LAUNDRY ROOM & LANDING DECK WITH STAIRS TO GRADECity of Norwalk · 2026-10-07$200,000
- CONSTRUCT SUNROOM OVER EXISTING REAR DECKCity of Norwalk · 2026-09-28$80,473
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 $15,017 and $73,500. 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
Deck in New JerseyDeck in New YorkDeck in ConnecticutDeck on Long Island