Across 148 permits filed since 2025-04-29, the median is $14,998; half of projects fall between $7,500 and $25,000. 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 London County, CT actually reported when they pulled permits.
Recent filings
- 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
- Deck repairGroton · 2026-10-23$14,200
- Screenroom with deck. This is an open air no heat space with a deck to access yardMontville · 2026-10-20$133,719
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 London County, CT came in between $7,500 and $25,000. 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