Deck Building Cost in Seattle (2026)
Average cost in Seattle
$5,270 – $65,000
$37 – $180 per sq ft
In Seattle, the average is $27,241 and most projects cost between $5,270 and $65,000, or about $37 – $180 per sq ft. Prices are before tax and based on 9 sources.
Cost Breakdown
ItemizedSkilled carpentry and installation
38%
Composite, cedar, or pressure-treated wood
40%
Seattle municipal rate (10.35%)
10%
SDCI fees and structural review
6%
Removal of existing structure
6%
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 project
LiveYour estimate in Seattle
Likely range $12,258 – $59,930
- Labor38%$10,352
- Materials40%$10,896
- Sales Tax10%$2,724
- Permits & Engineering6%$1,634
- Demolition & Disposal6%$1,634
Pressure-treated Wood
$27,241
Cedar
$37,019
Composite
$46,798
Hardwood (Ipe)
$63,910
Calibrated to 9 researched sources for Seattle. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$24,877
Today
$27,241
Deck Building in Seattle is ↑ 9.5% compared to roughly a year ago — about $2,363 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 providersGibson Fence and Deck
1423 10th Ave office 5, Seattle, WA 98122, USA
50 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 (Department of Construction & Inspections) permit fees for 2026 typically range from $800 to $2,500, depending on the project's total valuation. Fees saw an 18% year-over-year increase in 2026 to cover rising administrative costs.
Due to the city's topography, building on steep slopes (common in Queen Anne or Magnolia) adds $8 to $20 per square foot in structural reinforcement and engineering. If crane access is required for materials, expect an additional $1,000 to $3,000 per day.
In 2026, professional installation for composite decks (like Trex or AZEK) ranges from $55 to $80+ per square foot, while Western Red Cedar ranges from $25 to $40 per square foot. Despite the higher upfront cost, composite is preferred in Seattle's wet climate to avoid the $3,000–$5,000 in maintenance costs typically incurred over 20 years with wood.
Journeyman carpenter wages in the Seattle metro area for 2026 range from $38 to $52 per hour. Total labor costs typically account for approximately 38% of the total project budget.
📊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: 1 months 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.