Target keywords: building permit Seattle WA | deck permit Seattle | fence permit Seattle | how much does a permit cost in Seattle

Most Seattle homeowners don’t realize that the permit you pull — or skip — affects your home’s resale value, insurance coverage, and liability if something goes wrong. The good news: Seattle has one of the more efficient permitting systems in the region once you know how it works.

Does My Project Need a Permit in Seattle?

Seattle requires a building permit for most construction, alteration, or repair work. Here’s a quick breakdown by project type:

Decks and Outdoor Structures Any deck attached to the house requires a permit, regardless of size. Freestanding decks or platforms over 200 SF or more than 30 inches above grade also require a permit. If your deck is under 200 SF, detached, and less than 30 inches off the ground, it’s typically exempt.

Fences Fences up to 8 feet tall in Seattle are generally exempt from permitting — no permit needed for a standard privacy fence. Fences over 8 feet, or those located in a special overlay district, require a permit.

ADUs and Additions All accessory dwelling units (ADUs), additions, and new structures require a building permit. Seattle has streamlined ADU permitting in recent years and now allows backyard cottages and in-law suites on most single-family lots.

Siding Replacement Re-siding a home does not typically require a permit in Seattle unless you’re altering the structural envelope or the property is in a historic district.

Interior Remodels Any remodel involving structural changes, new electrical circuits, plumbing relocation, or HVAC work requires a permit. Cosmetic work (painting, flooring, cabinet replacement) does not.

Seattle Permitting Department

Seattle Department of Construction and Inspections (SDCI) – Website: seattle.gov/sdci – Online permit portal: permitapplications.seattle.gov – Phone: (206) 684-8850 – Address: 700 5th Ave, Suite 2000, Seattle, WA 98104

Most permits can be submitted online through the Seattle Services Portal. For simple projects (decks, fences, basic alterations), over-the-counter approval is often available.

Permit Fees in Seattle

Seattle’s permit fees are calculated based on the valuation of the work. Typical ranges for common residential projects:

Fees are subject to change. Seattle also charges a plan review fee (typically 65% of the permit fee) for projects that require drawings.

How Long Does Seattle Permitting Take?

• Simple over-the-counter projects (sheds, basic decks): Same day to 1–2 weeks
• Standard residential projects (additions, ADUs, remodels): 4–12 weeks
• Complex or large projects: 3–6 months

Seattle DCI has improved processing times in recent years. Using the online portal and submitting complete plans the first time will get you through faster.

What Seattle Inspectors Check

For decks and exterior structures, inspectors verify: footing depth and diameter, post connection hardware, ledger attachment (critical — improper ledger attachment is the most common deck failure), joist hangers, and railing height and balusters.

For interior remodels, inspections typically cover rough framing, rough electrical, rough plumbing, insulation, and final.

Let Prolific Handle the Permits

Permit management is included in every Prolific project. We handle the application, plan preparation, and inspection scheduling — you don’t wait on hold with SDCI. Get an estimate →

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