Seattle FAR change confirmed — most sources still wrong

Ordinance 127376 (effective January 21, 2026) struck the interim rule exempting ADU floor area from FAR. As of August 2026, both leading AI answers and most published guides — including some updated after the change — still describe the repealed exemption. If you're planning two units on a Seattle lot, model FAR first.

Current verified rules: Seattle ADU rules · All Washington cities