Washington · 2026 cost guide
How much does a deck cost in Washington?
In Washington, a deck costs about $5,500–$22,000 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly $17.25–$69 per square foot. That’s about 15% above the U.S. average.
Estimate your Washington project with the Deck Cost Calculator →
Washington cost breakdown
| Typical total (a 320 sq ft deck) | $5,500–$22,000 |
| Per square foot | $17.25–$69 |
| Metro areas (Seattle, Spokane, and Tacoma) | up to ~$24,000 |
| Versus U.S. average | about 15% above average |
What’s different about Washington
Washington's Cascadia seismic risk, wet maritime climate, and high Seattle-area labor costs combine to raise exterior project pricing.
- Seismic bracing and stronger connectors add to structural cost.
- Rot- and mold-resistant or composite materials are favored in humid climates.
- Permit fees and skilled-trade labor rates here run well above the national average — usually the single biggest cost driver.
Expect quotes toward the higher end in Washington’s larger metros — Seattle, Spokane, and Tacoma — where labor and permit costs run above the state average, and lower in rural areas.
How the cost is built
Deck cost depends on size, decking material (pressure-treated pine is cheapest; composite and PVC are mid-range; tropical hardwood is premium), and structural extras like railings, stairs, and elevated footings. Permits and ledger flashing add cost on attached decks.
Resale value
A wood deck recoups about 50–83% of its cost at resale — more than a composite deck — according to the annual Remodeling Cost vs. Value report.
Frequently asked questions
How much does a deck cost in Washington?
In Washington, a deck costs about $5,500 to $22,000 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly 17.25–69 per square foot. That's about 15% above the national average, reflecting local labor and material costs.
What affects the cost of a deck in Washington?
Washington's Cascadia seismic risk, wet maritime climate, and high Seattle-area labor costs combine to raise exterior project pricing. Seismic bracing and stronger connectors add to structural cost.
How can I get an accurate deck building estimate for my home?
Use the free Deck Cost Calculator to plug in your real measurements and materials, then collect two or three local quotes to compare. Within Washington, prices run higher in metros like Seattle, Spokane, and Tacoma and lower in rural areas.
Deck building cost by city in Washington
Deck building cost in nearby states
Keep planning
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Open calculator →Sources & method
The Washington figure is the national installed-cost range scaled by a Washington regional cost index (its construction costs run about 15% above the U.S. average), then adjusted for the local climate and code factors above. It’s a 2026 planning estimate, not a quote — get local bids before budgeting.
- Smart Cost Hub methodology — how our cost ranges and indices are built
- U.S. Bureau of Labor Statistics — Producer Price Index (construction materials)
- Deck Quotes Near Me — local Washington contractor quote data