Across 210 permits filed since 2025-03-09, the median is $29,000; half of projects fall between $10,000 and $119,750. 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 Greenwich, CT actually reported when they pulled permits.
Recent filings
- Install a new 10ft x 20 ft in ground plunge pool with associated pool equipment and pool patio/deck in rear yard.Town of Greenwich · 2026-09-03$132,000
- Unit 33A, Repair deck above garage. No change in material or footprint.Town of Greenwich · 2026-09-02$15,000
- Raising existing deck using existing footings and footprint. Changing orientation of stairs.Town of Greenwich · 2026-09-01$1,000
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 Greenwich, CT came in between $10,000 and $119,750. 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