Yes, you can build in Seattle — and the city has eliminated single-family-only zoning entirely. Seattle now allows up to 6 units on most residential lots under Neighborhood Residential zoning. ADUs are allowed with some of the most permissive rules in the nation. This is one of the most significant zoning reforms in U.S. history, dramatically expanding buildability on residential lots throughout the city.
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ADU Status
Yes — up to 2 ADUs per lot, no owner-occupancy
Common Zones
NR, LR, MR, HR, NC, C
Permit Timeline
4-12 weeks
Key Constraint
SEPA environmental review for larger projects
142 factors. 20+ government sources. Buildability Score in 20 seconds.
Score My Seattle Property FreeZoning rules in Seattle vary by address. Enter your specific property for accurate results. Always verify with the Seattle planning department before making decisions.