Across 1,669 permits filed since 2025-03-03, the median is $17,000; half of projects fall between $7,850 and $39,100. 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
- Complete strip and removal of shingles down to plywood/decking. Then plywood inspection. Then brought up to code with seam tape ice and water and underlayment. Then 54 sq of brand new architectural shingles installed.Southbury · 2026-08-31$38,987
- planning to add an above ground pool in the property with a size of 15x30x54 no decking just the pool with Roll-down outer section & lockable outer treads unauthorized access to poolSouthbury · 2026-08-31$5,300
- Construction of a 8' x 9'4" deck extension to existing rear deck; inclusive of new railings and deck board on existing portionTown of Granby · 2026-08-31$5,500
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 $7,850 and $39,100. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.