Accessory Structures in Renton, WA (2026)
5 verified accessory structures rules for Renton, Washington, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Renton allows ADUs by right in residential zones under RMC 4-2-115, consistent with WA HB 1337. Up to 2 ADUs per lot with no owner-occupancy requirement. Size limit typically 1,000 square feet.
Renton ADU Rules
Few RestrictionsShed Rules
Renton exempts sheds 200 square feet or less from building permits under WA State Residential Code and RMC 4-5-060. Larger sheds require building permits. Setbacks of 5 feet from side and rear property lines still apply.
Renton Shed Permit Rules
Some RestrictionsGarage Conversions
Garage conversions in Renton require building permits and must meet WA Residential Code. Converting to an ADU follows RMC 4-2-115. Parking replacement is waived within 0.5 mile of transit per HB 1337.
Renton Garage Conversion Rules
Some RestrictionsCarport Rules
Carports in Renton are treated as accessory structures under RMC 4-2-110 and require building permits over 200 sq ft. Side and rear setbacks are 5 feet. Front yard carports are generally restricted.
Renton Carport Rules
Some RestrictionsTiny Homes
Tiny homes on permanent foundations are allowed in Renton as ADUs or dwellings under RMC 4-2-115 and HB 1337, per IRC Appendix Q. Tiny houses on wheels are treated as RVs and cannot be permanent residences.
Renton Tiny Home Rules
Some RestrictionsLooking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Renton city rules.
Accessory Structures in King County →