Deck Building Cost in Seattle (2026)
Average cost in Seattle
US$5,200 — US$65,000
US$37 — US$180 per sq ft
Cost Breakdown
ItemizedLumber, composite boards, and hardware
42%
Skilled carpentry and installation
38%
Seattle 10.35% municipal rate
10%
Seattle DCI plan review and inspections
7%
Grading and old deck removal
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 12 sources and market data for Seattle. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$27,310
Today
US$29,085
Deck Building in Seattle is ↑ 6.5% compared to roughly a year ago — about US$1,775 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 providersStar Construction WA - Louvered Roof & Solar Shades Seattle
2220 164th Pl SE, Bothell, WA 98012, USA
50 reviews
MasterDecks by People Come First Construction Group
640 Central Ave S, Kent, WA 98032, USA
137 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
Seattle DCI permit fees for 2026 typically range from $800 to $2,500 depending on project valuation. This includes a 6.5% inflationary adjustment and an 18% year-over-year increase for construction permits implemented in January 2026.
Building on steep slopes in neighborhoods like Queen Anne or Magnolia increases costs to $55–$80+ per sq ft, compared to $37–$45 per sq ft for flat-lot ground-level projects, due to additional engineering and structural support requirements.
In 2026, a standard cedar deck in Seattle costs between $50 and $100 per sq ft installed. Switching to premium composite or hardwood (like Ipe) increases the range to $80–$180 per sq ft, though it offers significantly lower maintenance in the wet PNW climate.
Yes, Seattle's 10.35% sales tax applies to the full project contract, including both materials and labor. For a median $31,500 project, homeowners should budget approximately $3,260 specifically for sales tax.
📊Our Methodology
How we collect dataAggregated from 7+ 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: 2 weeks 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.