What is a Seattle Master Use Permit (MUP), and when is it required?
Answered by AskBaily Editorial · Updated
Short answer
A MUP is Seattle's design-review + SEPA environmental + zoning entitlement wrapper. It's required for most multi-family work, townhouses, substantial additions in single-family zones, any project triggering a SEPA threshold under WAC 197-11, and most Design Review Board-reviewed projects. A MUP adds 6-24 weeks on top of the building permit clock and is filed through the Seattle Services Portal.
In detail
A Master Use Permit is Seattle's umbrella land-use entitlement, and it bundles every discretionary review a project needs before SDCI will accept the construction permit application. The MUP framework is set out in Seattle Municipal Code Chapter 23.76 (Procedures for Master Use Permits and Council Land Use Decisions), and it functions as the city's mechanism for combining zoning, design, environmental, and shoreline review into a single appealable decision.
MUP is required whenever a project triggers any of the following: a SEPA environmental threshold under WAC 197-11-800 and SMC 25.05; Design Review Board jurisdiction under SMC 23.41 (typically multi-family and most projects above 4 units or specific size thresholds in commercial and lowrise zones); a variance, conditional use, special exception, or contract rezone under SMC 23.40 through 23.45; Shoreline Substantial Development Permit jurisdiction under SMC 23.60A and the state Shoreline Management Act; subdivision or short-plat approval; or any use over a threshold that requires a discretionary decision rather than a ministerial permit.
Processing time depends on the components. A Type I administrative MUP — no SEPA, no design review, no public comment period — issues in 6 to 10 weeks. A Type II MUP with SEPA, public notice, and a written threshold determination runs 14 to 24 weeks. A Type III MUP requiring early outreach and Design Review Board public meetings, often the case for townhouse and rowhouse projects in NR2/NR3 and lowrise zones, regularly extends to 9 to 12 months including the appeal window. Once issued, the MUP is appealable to the Seattle Hearing Examiner under SMC 3.02 within 14 calendar days.
MUPs are filed through the Seattle Services Portal as an Intake application, separate from the building permit. The construction permit cannot issue until the MUP is final, including resolution of any appeal. For a residential remodel, MUP rarely applies — but for additions in single-family zones that exceed FAR or rear-yard limits, or any work in a Shoreline District, ECA, or Landmarks-designated structure, screening for MUP applicability should happen before architectural design starts.
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