Accessory dwelling units exempt from public street improvements
Seattle Mun. Code § 23.53.003
in effectNotwithstanding any conflicting requirements in this Chapter 23.53 , no public street improvements, other than public street improvements required by state or federal law, shall be required as a condition of permitting accessory dwelling units for construction, conversion, expansion, change of use, or other development method. This does not preclude requiring the repair or replacement of existing improvements as needed due to development of an accessory dwelling unit. For purposes of calculating required street improvements in this Chapter 23.53 , accessory dwelling units shall be excluded from dwelling unit counts. (Ord. 127211 , § 15, 2025.)
Source: Seattle Municipal Code (Municode library)URL: https://library.municode.com/wa/seattle/codes/municipal_codeFetched: 7/25/2026