Deck Building Cost in Seattle (2026)
Average cost in Seattle
US$8,000 — US$65,000
US$45 — US$180 per sq ft
Cost Breakdown
ItemizedSkilled carpentry and installation
45%
Decking, framing, and hardware
40%
SDCI building permits and inspections
7%
Site plans and structural review
5%
Debris removal and site cleanup
3%
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 8 sources and market data for Seattle. Actual costs may vary depending on specific project requirements.
🏢Top Deck Build Contractors in Seattle
Verified providersStar Construction WA - Louvered Roof & Solar Shades Seattle
2220 164th Pl SE, Bothell, WA 98012, USA
49 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, any deck with a roof, or any deck attached to a house. Permit fees for 2026 typically range from $1,059 for a $12,000 project to over $2,500 for high-value builds.
Capped composite decking (like Trex Transcend or TimberTech AZEK) is the top recommendation for 2026 due to its moisture resistance and low maintenance. While it costs $80–$180 per sq ft installed, it avoids the rot and moss issues common with wood in the Pacific Northwest.
Seattle labor rates for deck construction are 25–40% higher than national benchmarks. In 2026, skilled journeyman carpenters in the Seattle metro area average $38–$52 per hour, with total project labor costs typically accounting for 45-55% of the budget.
A professionally built deck in the Seattle market currently delivers a 65% to 80% return on investment at resale, as outdoor living spaces are highly valued in the Puget Sound region for year-round use.
📊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: today. Updates run weekly. All costs in USD.