Across 1,908 permits filed since 2025-04-26, the median is $17,542; half of projects fall between $8,000 and $38,831. 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
- Deck repairGroton · 2026-10-23$14,200
- ****JIM IS ASSIGNED TO THIS**** HUD Manufactured Home 22.8 X 52 with a covered porch which is part of the HUD home within the 22'8"x56' home size, no carport, no deck. 8' x 10' Kloter Farm Shed. The shed will be wired and there will be a pTown of Southington · 2026-10-23$195,000
- Building a freestanding deck to gain access to a room on the 2nd floor of our barn. The deck will be 18.5 x 10 feet and 8.5 feet off the ground. The door to the room is 8.5 feet off the ground. We will be pouring 10 cement footers that aSimsbury · 2026-10-23$12,000
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 $38,831. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.