Across 71 permits filed since 2025-01-25, the median is $18,000; half of projects fall between $6,000 and $37,500. 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 Middlesex County, CT actually reported when they pulled permits.
Recent filings
- Tear out existing deck (8x14) replace with pressure treated and composite (10x14) deckTown of Westbrook · 2026-07-07$8,200
- *Replacement of existing deckTown of Westbrook · 2026-07-07$9,000
- Construction of wrap around deck. Contractor only building drck only. Footings done by a different contractorHADDAM · 2026-07-01$27,500
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 Middlesex County, CT came in between $6,000 and $37,500. We exclude permits under $1,000, jobs filed as whole-house construction, and counties whose building departments don't reliably report valuations.