Everything you need to know about getting a deck permit in Seattle: fees, requirements, exemptions, and direct links to the Seattle Department of Construction & Inspections (SDCI).
Permit Fees
Valuation-based. SDCI provides downloadable Fee Estimator spreadsheets. ~75% due at application acceptance, remainder at permit issuance.
Processing Time
Subject-to-field-inspection permits (most standard decks): issued within 48 hours. Addition/alteration permits (complex decks): standard review, currently running up to 4 weeks longer than normal due to November 2024 code transition backlog.
Apply Online
Yes — via SDCI Online Portal
Building Code
2021 Seattle Building Code (based on 2021 IBC with Seattle amendments), effective November 15, 2024
Contact: (206) 684-8600
Decks 18 inches or less above ground: no permit required (unless in an Environmentally Critical Area). Decks over 18 inches above ground require a permit.
If your deck does NOT meet all exemption criteria, you must obtain a permit before construction. Building without a required permit can result in fines, stop-work orders, and required demolition.
Review the exemption criteria above. If your deck exceeds any threshold, a permit is required.
You'll need a site plan, deck dimensions, framing details, and footing specifications. Check Seattle's specific documentation requirements.
Apply through SDCI Online Portal . Pay the permit fee at submission.
Once approved, post your permit visibly and schedule required inspections (typically footing, framing, and final).
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Sources
Data verified April 2026. Fees, processing times, and requirements are subject to change. Always confirm current information with Seattle's Seattle Department of Construction & Inspections (SDCI).