Across 71 permits filed since 2025-04-24, the median is $9,800; half of projects fall between $7,000 and $20,150. 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 New Haven, CT actually reported when they pulled permits.
Recent filings
- Add an 8 foot by 12-foot addition to the one-story deck approved under B-26-00605. The deck will end at the plane of the front of the house. Footings will be a 12-inch sonotubes 42 inches deep. Any other work will require additional permiCity of New Haven · 2026-10-15$4,000
- Strip and remove existing shingles on home, to decking: 1 layers 18.62 sq Install lifetime Architectural Shingles Current Ventilation on the house : Gable vents Ventilation is not properly working and will be modified. There is also a ridgeCity of New Haven · 2026-10-06$11,500
- 25'x10' Deck with footings to include replacement of existing back porch. CACity of New Haven · 2026-10-06$13,900
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 New Haven, CT came in between $7,000 and $20,150. 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