Deck Building Cost in Seattle (2026)
Average cost in Seattle
US$12,000 — US$78,000
US$55 — US$175 per sq ft
Cost Breakdown
ItemizedSkilled carpentry and site prep
45%
Decking, framing, and hardware
39%
Seattle 10.35% rate
10%
SDCI fees and structural review
5%
Debris removal and hauling
1%
Sales Tax at 6.5%
📋What's Included
ScopeTypically Includes
- Pressure-treated lumber
- Concrete footings
- Railing system
- Stairs (1 set)
- Hardware & fasteners
- Labor
Typically Excludes
- Composite or hardwood decking
- Built-in seating or planters
- Pergola or roof
- Lighting
- Permits
Based on a standard 200 sq ft pressure-treated wood deck.
🧮Estimate Your Cost
InteractiveEstimated Cost
US$6,800 — US$10,200
Based on 9 sources and market data for Seattle. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$32,558
Today
US$35,000
Deck Building in Seattle is ↑ 7.5% compared to roughly a year ago — about US$2,442 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top Deck Build Contractors in Seattle
Verified providersArchadeck of Seattle Eastside
410 Bellevue Way SE Suite 2, Bellevue, WA 98004, USA
81 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
Yes, the Seattle Department of Construction and Inspections (SDCI) requires a permit for any deck more than 18 inches above grade, all roof decks, and decks in environmentally critical areas. Permit fees typically range from $924 to $3,000 depending on project value.
In 2026, premium composite decking (like Trex or TimberTech) installed in Seattle costs between $80 and $180 per square foot. This includes the 10.35% local sales tax and reflects labor rates of $55–$75 per hour.
Elevated or second-story decks carry a 25% to 50% premium over ground-level builds due to deeper concrete footings, structural engineering requirements, and the addition of stairs, which cost $1,500 to $4,000 per flight.
Capped composite and PVC are highly recommended for the Pacific Northwest's wet climate to prevent rot and moss. While Western Red Cedar is a popular natural alternative at $60–$100 per square foot, it requires annual sealing to survive Seattle's moisture.
📊Our Methodology
How we collect dataAggregated from 5+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: 4 days ago. Updates run weekly. All costs in USD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.