Across 74 permits filed since 2025-03-08, the median is $17,900; half of projects fall between $6,000 and $46,000. 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 Middlesex County, CT actually reported when they pulled permits.
Recent filings
- Demo existing deck and build new deck 27' x 10'; with stairs and replacement of patio doorHigganum · 2026-08-21$48,000
- Redeck existing with trex; buld platform for new hot tube to meet top of deckHaddam · 2026-08-19$12,300
- *Remove current deck and overhang. install all new sono tubes along with all new decking to home deck. Please see attached drawings.Town of Westbrook · 2026-08-13$29,500
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 $46,000. 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
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