Fees
Estimated city fees
Baseline for a simple permitted deck: $250–$700 estimated city fees for a permitted residential deck (varies by construction valuation; Washington State surcharge included)
| Fee | Amount | Notes |
|---|---|---|
| Building permit fee | $250–$700 (estimated, based on construction valuation) | Seattle DCI calculates permit fees using a valuation-based sliding scale per the Seattle Construction Permit Fees schedule. Verify the current rate at seattle.gov/sdci/permits/permits-we-issue/building-permits before submitting. |
| Plan review fee | 65% of the building permit fee (estimated) | Seattle DCI assesses a plan review fee equal to approximately 65% of the building permit fee for projects requiring plan check. Simple residential decks eligible for over-the-counter (OTC) review may have a streamlined plan review charge assessed at submission. |
| Washington State surcharge | Included in permit fee | Washington State Building Code Council assesses a small surcharge per permit, collected by Seattle DCI at the time of permit issuance and forwarded to the State Building Code Council. |
| Inspection fee | Included | Required inspections (footing/foundation, framing, final) are covered under the permit. Re-inspection fees apply if work fails or is not ready when the inspector arrives. |
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Conditions
The rules that apply
- Permit required for any deck attached to the house.
- Permit required for any freestanding deck more than 30 inches above grade at any point.
- Permit required for any freestanding deck over 200 square feet in area.
- A freestanding deck that is 30 inches or less above grade at all points and 200 square feet or less in area may be exempt from the building permit requirement.
- Exempt decks must not serve as a required means of egress from the dwelling.
- Decks in or near critical areas (steep slopes, shorelines, wetlands, or landslide-prone areas) may require a separate critical area review and are subject to Seattle's Critical Areas Ordinance.
- Seattle zoning setbacks, floodplain restrictions, and any applicable HOA restrictions apply regardless of permit exemption status.
Documents
What you'll need to file
- Completed building permit application submitted through the Seattle Services Portal (seattleservicesportal.seattle.gov).
- Site plan drawn to scale showing property lines, setbacks, critical areas, easements, existing structures, and the proposed deck location and dimensions.
- Construction drawings including plan view, elevations, framing layout, footing sizes, and overall dimensions.
- Structural details for footings, posts, beams, joists, connectors, guardrails, and stair configuration where applicable.
- Ledger attachment detail and flashing specifications if the deck is attached to the dwelling.
- Property survey or plot plan if the deck is near a setback line, easement, critical area, or utility corridor.
- Critical area report or waiver if the property contains or is adjacent to steep slopes, landslide-prone areas, shorelines, or wetlands.
- Owner authorization or contractor license documentation (Washington State contractor registration required) if a contractor applies on the owner's behalf.
- Any required HOA approval documentation per your subdivision restrictions.
Process
How the permit process works
Sequential — each step gates the next.
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Determine whether your deck requires a permit Check whether the deck is attached to the house, or whether it exceeds 30 inches above grade at any point or 200 square feet as a freestanding structure. If any condition applies, a building permit is required through Seattle DCI. Also check whether your property is in or adjacent to a critical area, which may require additional review.
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Prepare plans and supporting documents Draw up a site plan and construction drawings showing footings, posts, beam sizes, joist spacing, decking layout, guardrail details, and stair layout if applicable. Seattle plan reviewers reference the Washington State Building Code (WSBC), which is based on the 2021 IRC with Washington-specific amendments under WAC 51-51. Standard IRC-compliant structural details are generally accepted.
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Submit through the Seattle Services Portal Create or log in to an account at seattleservicesportal.seattle.gov, select the appropriate residential building permit type, upload your documents, and pay the plan review deposit. Simple residential deck projects may qualify for over-the-counter (OTC) review, which can be completed the same day at the Seattle DCI permit counter at the Seattle Municipal Tower.
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Respond to plan review comments Seattle DCI reviewers evaluate the submittal against the WSBC and Seattle Municipal Code Chapter 22.600. If corrections are requested, update the drawings and resubmit through the portal. OTC projects are reviewed while you wait at the DCI permit counter (700 5th Ave, Suite 2000, Seattle, WA 98104).
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Receive approval and pay remaining fees Once the permit is approved and all fees are paid in full, download or print the issued permit. Keep the permit and approved plans accessible at the job site during all phases of construction. Seattle requires approved plans to be on-site during inspections.
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Schedule required inspections Request inspections through the Seattle Services Portal or by calling the Seattle DCI inspection request line as construction progresses. A typical deck requires a footing or foundation inspection before pouring concrete, a framing inspection before covering structural members, and a final inspection.
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Pass final inspection and close out the permit After the inspector signs off on the final inspection, the permit is closed and the completed deck becomes part of the official city record. This protects you during home sales, insurance claims, and future permitting in Seattle.
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Provenance
Code basis & official sources
Last verified 2026-04-13.
Washington State Building Code (WSBC) as adopted under WAC 51-51, based on the 2021 International Residential Code (IRC) with Washington-specific amendments. Enforced by the City of Seattle Department of Construction and Inspections (DCI) under Seattle Municipal Code Chapter 22.600 (Seattle Building Code).
Residential permit page: https://seattleservicesportal.seattle.gov/
If you skip the permit
- Seattle DCI can issue a stop-work order if unpermitted construction is discovered.
- The city may require the deck to be removed or structurally opened for inspection at the owner's expense.
- Civil penalties and daily fines can accrue under the Seattle Municipal Code until the violation is resolved.
- Homeowner's insurance may deny claims for damage caused by or related to unpermitted structures.
- Unpermitted work flagged during a home sale can delay or derail a transaction, and retroactive permitting (an after-the-fact permit) is significantly more expensive and disruptive than doing it upfront.
- Unpermitted decks may create liability exposure if a guest is injured on a structure not inspected for code compliance.
- Washington requires a registered contractor for permitted work performed by a contractor; using an unregistered contractor can expose both owner and contractor to additional penalties under RCW 18.27.
FAQ
Common Seattle deck permit questions
Do I need a permit to build a deck in Seattle, WA?
Usually yes. A building permit is required for any deck attached to the house and for any freestanding deck that is taller than 30 inches above grade at any point or larger than 200 square feet. A small, low freestanding deck at or below 30 inches and 200 square feet or less may not require a permit, but Seattle zoning setbacks and HOA rules still apply. Decks near critical areas (steep slopes, shorelines, wetlands) may require additional review regardless of size.
How much does a Seattle deck permit cost?
Seattle DCI permit fees are based on the declared construction valuation. For a typical residential deck, expect roughly $250–$700 in combined building permit and plan review fees, plus a Washington State Building Code Council surcharge. Actual amounts depend on project size, scope, and valuation. Confirm the current fee schedule at seattle.gov/sdci/permits before applying.
Where do I apply for a deck permit in Seattle?
Submit your application online through the Seattle Services Portal at seattleservicesportal.seattle.gov. In-person service is available at Seattle DCI, 700 5th Ave, Suite 2000, Seattle Municipal Tower, Seattle, WA 98104.
What documents are required for a Seattle deck permit?
At minimum, submit a scaled site plan, construction drawings with dimensions and framing layout, footing and structural details, and a completed permit application. For an attached deck, include a ledger attachment and flashing detail. If your property has steep slopes or is near a shoreline or wetland, a critical area report or waiver may be required. If a contractor applies for you, include the contractor's Washington State registration number and appropriate authorization.
How long does plan review take in Seattle?
Standard residential deck submittals typically take 10–20 business days for plan review at Seattle DCI. Simple deck projects may qualify for over-the-counter (OTC) review, which can be completed the same day at the DCI permit counter. Expedited review is also available for an additional fee. Total project time from application to final inspection is generally 4–8 weeks.
What building code does Seattle use for decks?
Seattle enforces the Washington State Building Code (WSBC), which is based on the 2021 International Residential Code (IRC) with Washington-specific amendments under WAC 51-51. Local requirements are codified in the Seattle Building Code under Seattle Municipal Code Chapter 22.600. Deck design and framing should comply with WSBC Section R507 (Exterior Decks) and applicable structural provisions.
Can I build a small deck without a permit in Seattle?
Possibly, if the deck is freestanding (not attached to the house), no more than 30 inches above grade at any point, and 200 square feet or less in area. However, Seattle zoning setbacks still apply, and decks in or near critical areas (steep slopes, shorelines, wetlands, landslide-prone areas) may require a critical area review even for exempt structures. HOA covenants may impose additional restrictions. If in doubt, contact Seattle DCI before you build.
What is a critical area in Seattle and how does it affect my deck permit?
Seattle's Critical Areas Ordinance (Seattle Municipal Code Chapter 25.09) designates environmentally sensitive areas including steep slopes (greater than 40%), landslide-prone areas, shorelines, wetlands, and fish and wildlife habitat. If your property contains or is adjacent to a critical area, your deck project may require a separate critical area review, additional setbacks, or a geotechnical report regardless of whether the structure itself requires a permit. Check the Seattle Property Information Toolkit (SPIT) or contact Seattle DCI to determine if critical areas affect your property.
What inspections are required for a Seattle deck permit?
A standard residential deck permit typically requires a footing or foundation inspection before pouring concrete, a framing inspection before covering structural members, and a final inspection upon completion. Approved plans must be on-site during all inspections. Your permit documentation will list the specific inspections required for your project.
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Disclaimer: Informational only — not legal advice. Rules change; verify with Seattle permitting staff before you build.