DeckPermitCheck

Seattle, WA

Seattle Deck Permit Check.

Seattle requires a construction permit for a deck more than 18 inches above the ground, a roof deck, or a deck in an environmentally critical area.

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Deck permit answer

Seattle requires a construction permit for a deck more than 18 inches above the ground, a roof deck, or a deck in an environmentally critical area.

Seattle decks guidance High confidence
Deck permit answer

Seattle requires a construction permit for a deck more than 18 inches above the ground, a roof deck, or a deck in an environmentally critical area.

Land-use setbacks, lot coverage, guardrails, stairs, structural attachment, shoreline, landmark, and flood rules can still apply to a lower deck.

What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedSeattle decks guidance
Next stepCheck official deck/accessory-structure rules with deck dimensions and height.
Permit requiredMore than 18 in above ground; roof deck; or environmentally critical-area location
Lower deckMay avoid a construction permit if none of the triggers apply
Still verifyLand use, setbacks, guardrails, stairs, attachment, shoreline, landmark, and flood rules
Confidence: HighComputed rule answerReviewed jurisdiction ruleReviewed July 2026
Seattle decks guidanceOfficial source
decksdciexact answerofficial rulereviewed threshold

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Common questions

What source does DeckPermitCheck use for Seattle, WA?

Seattle decks guidance. Official agency pages remain final.

Can I act on this DeckPermitCheck result without checking the agency?

No. Land-use setbacks, lot coverage, guardrails, stairs, structural attachment, shoreline, landmark, and flood rules can still apply to a lower deck. Use the official source link before making a legal, safety, construction, property, or financial decision.