TOOL_03 / Local code

What you can build.

One card per city. Setbacks, parking, owner-occupancy, max sqft, and the permit-review window we've actually measured on our last 150 builds.

ZONE_OUT / SMC 23.44.041Two ADUs per lot

Seattle, WA

One AADU + one DADU permitted on most single-family lots. No off-street parking required. STR limited to operator's primary residence + one additional unit.

Max DADU size: 1,000 sf
Max AADU size: 1,000 sf
Max height: 24 ft
Side setback: 5 ft
Rear setback: 5 ft
Parking required: Waived
Owner-occupancy: Not required
Short-term rental: Allowed
Detached ADUs / lot: 1

Typical permit review

12–20 weeks

REFERENCES · Each city's published municipal code section, current as of 2025. Always verified against your lot before bid.

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