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Deck know-how from the field

Materials, permits, maintenance and honest costs — written by the people who build them across Seattle and the Eastside.

New composite deck with black aluminum cable railing and wide stairs behind a Pacific Northwest home after rain Deck Building Tips
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How Much Does a Deck Cost in Seattle? 2026 Prices, Permits & Materials Guide

A new deck in the Seattle area typically costs $45–$105 per square foot installed in 2026 — about $14,000–$34,000 for a 16×20 deck, depending on material. Here is what drives the price, how wood compares to composite, p…

17 min read
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