How much does a deck cost in Seattle, WA?
Wood or composite deck with railings and stairs. Priced against Seattle, WA material costs, a typical DIY deck in Seattle runs about $3,850 in materials — 18% above the national average. These are estimates only, not a quote — enter your real dimensions in the free calculator for a shopping list matched to your build.
Estimates only — not a quote.
Seattle cost breakdown
| Estimate | Low | Typical | High |
|---|---|---|---|
| Seattle (DIY materials) | $3,273 | $3,850 | $5,198 |
| National average | $2,774 | $3,263 | $4,405 |
Priced from the Seattle, WA material index — 18% above the national average. Based on a common-size deck; enter your own dimensions for an exact number.
DIY materials estimate: $3,850. A contractor in the Seattle market (materials plus about 72 labor hours at ~$78/hr) estimates to $9,148–$12,266. Estimated DIY savings: $6,545 (63%).
A deck walking surface more than 30 in above grade typically requires a building permit, and footings are usually specified to a 18 in frost depth.
Outside city limits, King County is typically the permitting authority.
Get your exact Seattle price
The planner opens pre-filled with the same typical deck behind the numbers above — change any answer to match your build and the price updates instantly.
Frequently asked questions
How much does a deck cost in Seattle, WA?
Materials typically run $3,273–$5,198 for a common-size project using Seattle-area pricing. That is an estimate, not a quote — our free calculator prices your exact dimensions.
Is it cheaper to DIY or hire a contractor in Seattle?
DIY materials estimate to about $3,850. A local contractor estimates to $9,148–$12,266 at the Seattle-area labor rate of roughly $78/hr, so DIY could save an estimated $6,545 (63%).
Do I need a permit for a deck in Seattle?
A deck walking surface more than 30 in above grade typically requires a building permit, and footings are usually specified to a 18 in frost depth. King County and the City of Seattle rules can be stricter than the state baseline — run the free permit lookup for your ZIP before buying materials.
Why is Seattle deck pricing different from the national average?
We apply a regional material cost index for the Seattle market — currently 18% higher than the national average. Labor is indexed separately at about $78/hr for the contractor comparison.
Other projects in Seattle
Deck cost in nearby cities
Looking at the whole state? Deck cost in Washington.