Across 79 permits filed since 2025-04-24, the median is $10,000; half of projects fall between $4,800 and $16,000. 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 Litchfield County, CT actually reported when they pulled permits.
Recent filings
- Run gas piping from existing, under deck to living room to feed fireplace. Pressure test and connect to existing pipingTown of Watertown · 2026-10-22$1,075
- Repairs to existing deck - remove and install new pressure treated decking, railing, stairs - design per attached drawings. Repair existing framing if and as needed. No changes to existing footings or deck size/footprintTown of Watertown · 2026-09-30$10,650
- replacing old decking and replace with timber tech azek decking(11'x24') , keeping the original posts and railing and replace 3 steps, will replace any old rotting wood, if necessary.Town of Watertown · 2026-09-24$19,500
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 Litchfield County, CT came in between $4,800 and $16,000. 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