Across 1,915 permits filed since 2025-04-27, the median is $17,633; half of projects fall between $8,000 and $38,976. 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 Connecticut actually reported when they pulled permits.
Recent filings
- Replacement of existing residential deck within the existing footprint, including new code-compliant footings and structural framing, ledger attachment and flashing. TimberTech composite decking, stairs, railings and fascia, per submitted pTown of Weston · 2026-10-26$39,530
- New roof (on garage too), new deck, install transom window in loft, install 3 basement windows, swap out 6 lights, swap out vanity, swapped out shower enclosure, swapped out AC coil & condenser.Southbury · 2026-10-26$25,000
- Building a new construction deck which is 192 sq ft. The deck is 16 ft going down the house(ledger board)side. Facing away from house left side goes out 16ft then comes over to the right 8ft coming back towards the house 8 ft going to the lMontville · 2026-10-26$3,000
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 Connecticut came in between $8,000 and $38,976. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.