Accessory Structures in Renton, WA (2026)
2 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 up to two ADUs per legal lot in the RC, R-1, R-4, R-6, R-8, R-10 and R-14 zones, attached or detached. Each ADU is capped at 1,000 square feet of gross floor area, with detached units held to 24 feet in building height and specific side and rear setbacks by zone.
Renton Accessory Dwelling Unit Rules
Some RestrictionsRenton Municipal Code 4-2-110C
GENERAL REQUIREMENTS Maximum Number of Units: Two (2) ADUs are allowed per legal lot as an accessory use to a principal dwelling. Configuration: Either one (1) attached ADU and one (1) detached ADU, two (2) attached ADUs, or two (2) detached ADUs. ADUs may be established within or as an addition to the principal dwelling. Maximum Gross Floor Area: 1,000 sq. ft. Maximum Building Area: 1,000 sq. ...
Shed & Carport Rules
Renton limits detached accessory buildings like sheds and garages to two structures of 720 square feet each (or one at 1,000 square feet) in most residential zones, capped at 12 feet tall, set at least 4 feet from the house, and no closer than 3 to 5 feet to side and rear property lines.
Renton Shed and Accessory Building Rules
Some RestrictionsRenton Municipal Code 4-2-110E
RC and R-1: 2 structures - max. 720 sq. ft. per structure, or 1 structure - max. 1,000 sq. ft. In addition, 1 barn or stable - max. 2,000 sq. ft., provided the lot is 5 acres or more. R-4, R-6, and R-8: 2 structures - max. 720 sq. ft. per structure, or 1 structure - max. 1,000 sq. ft. R-10 and R-14: 1 structure per residential unit - max. 400 sq. ft.; ... Except greenhouses, sheds, or other sim...
Looking for King County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Renton city rules.
Accessory Structures in King County →