Substantial development.
Seattle Mun. Code § 23.71.007
in effectFor the purposes of this Chapter 23.71 , "substantial development" means any new development, or expansion or addition to existing development, when the new development, expansion or addition exceeds 4,000 square feet in gross floor area, excluding accessory parking area. (Ord. 116795 , § 2, 1993.)
Source: Seattle Municipal Code (Municode library)URL: https://library.municode.com/wa/seattle/codes/municipal_codeFetched: 7/25/2026