Seattle Remodeling Permit Guide
Which remodeling projects require a permit in Seattle, how the application process works, and what to expect from inspections — without the jargon.
When a Permit Is Required
Most projects that change your home's structure, footprint, or major systems need a permit. That includes additions, ADUs, structural wall changes, new or relocated plumbing and electrical, HVAC work, window changes in bedrooms, and finishing a basement or attic as living space.
Cosmetic updates — painting, replacing fixtures in the same location, swapping cabinet doors, installing new flooring over existing subfloor — generally do not. When in doubt, call the Seattle Department of Construction & Inspections (SDCI) or ask a licensed contractor who knows the local rules.
Common Permit Types
Different scopes trigger different permits. A single kitchen renovation can involve a building permit plus separate electrical, plumbing, and mechanical permits. Knowing which apply avoids surprise delays mid-project.
For rental conversions and ADUs, Seattle has specific rules about occupancy, parking, and minimum unit size. Reviewing the city's ADU checklist before designing anything is often worth a week of avoided rework.
The Application Process
Once your plans are ready, the application is submitted to SDCI, often with a set of stamped engineering and energy-code compliance details. Review times vary widely: small over-the-counter permits may be a same-day review, while larger projects can take several weeks, especially during seasonal surges.
Incomplete submissions are the most common cause of delay. Providing a thorough plan set — including a site plan, floor plan, electrical and plumbing layouts, and any structural details — up front makes the review far smoother.
Inspections, the Right Way
Inspections are scheduled at key milestones: framing rough-in, insulation, and final. The work can't be closed up until the inspector signs off at each stage. Schedule the inspection early in the window — if the inspector flags an issue, you'll have time to correct it before the next trade arrives.
Keep the approved plans and inspection card on site. Seattle inspectors are thorough, and having documentation of what was approved prevents confusion in the field.
- Structural, MEP, footprint, and ADU work always need permitting.
- Cosmetic updates usually don't — confirm if you're unsure.
- A complete plan set prevents most review delays.
- Schedule inspections early in the window to leave time for corrections.
- For ADUs, start with the city's published checklist.
Common Questions
Simple over-the-counter permits can be same-day. Larger new-construction or addition projects can take four to six weeks or more, particularly during seasonal peaks. Submit early and submit complete.
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