How the Seattle Deck Prices on This Site Are Compiled

From contractors' own published prices across Seattle, the Eastside and Snohomish County, collected on September 17, 2026. Each range in the deck cost guide rests on three to five local price pages: composite at $40–$75 per square foot installed, cedar at $34–$45, any material at $40–$110 and tear-out at $3–$8. Every page behind a range is named in the Sources list at the bottom of the page that uses it.

Close, but more useful. A range runs from the typical low figure to the typical high figure those builders publish for installed work, so it shows the spread instead of hiding it in one number. A figure only one builder publishes, such as a 12 by 16 foot deck near $10,500, is shown as that builder's example, not as the Seattle price.

Anything that is not an installed deck price from a Seattle-area contractor. Material-only prices, such as $2–$4 per sq ft for pressure-treated boards, are shown on their own because they leave out labor, which is most of a Seattle deck's cost. Permit fees are handled separately in the permit guide.

Because your yard sets the price. Height above the ground, a sloped lot, footings, the railing length, stairs, the old deck coming out and access for materials all move a deck by thousands of dollars. Only a pro who sees the site can quote it; send a request and our vetted local deck pro puts that number in writing.

Each range carries the date it was collected. When the sources are checked again and a figure moves, the new range and its date replace the old one in the cost guide, and the change is logged on the deck price updates page.