Most decks in Seattle require a subject-to-field-inspection construction permit from SDCI. Patios and platforms under 18 inches above grade that are not over a basement do not need a permit. Decks over 36 inches above ground count toward lot coverage limits.
Seattle requires a construction permit for most deck projects. SDCI offers a streamlined subject-to-field-inspection (STFI) permit for straightforward deck construction. Platforms, walks, and driveways do not require a permit if they are less than 18 inches above grade and are not over a basement or other building story. Decks more than 36 inches above the ground count toward lot coverage limits. In neighborhood residential zones (NR1, NR2, NR3), total lot coverage including all structures and elevated decks cannot exceed 35% of the lot on lots 5,000 sq ft or larger, or 1,000 sq ft plus 15% of the lot area on smaller lots. Deck construction must comply with the current building code for structural requirements including footings, joists, ledger connections, and railings. Railings are required on decks 30 inches or more above grade and must be at least 36 inches tall. Decks in environmentally critical areas, shoreline zones, or historic districts may require additional review.
Building without permit: retroactive permit fees plus penalties. Non-compliant structures may require modification or removal.
Seattle, WA
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Seattle, WA
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Seattle, WA
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Seattle, WA
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Seattle, WA
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Seattle, WA
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See how Seattle's deck & patio permits rules stack up against other locations.
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