3205 38TH AVE SW

The primary house is typically 15 ft from the front with one or two homes, or 10 ft with three or more. Rear yards follow the same pattern unless the rear line is an alley (0 ft). Side setbacks are a 5 ft average with a 3 ft minimum. Buildings stay 5 ft apart. Source 1

Not counted in the ADU size cap: Up to 250 sq ft of an attached garage; Stories or portions of stories that are underground; Up to 35 sq ft of long-term bicycle parking. Seattle repealed the old 3,200 sq ft minimum for a detached ADU. An ADU does not need its own minimum lot size. No off-street parking is required for an ADU. Other homes on the lot generally need one space per two homes, with exceptions within a half mile of a major transit stop and for homes of 1,200 sq ft or less. Source 2 Source 1