ADU rules in Yakima County, WA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Washington's HB 1337 (RCW 36.70A.681) requires Yakima County to allow at least two accessory dwelling units on lots within its urban growth areas, cannot cap ADUs below 1,000 square feet, and cannot require owner-occupancy.
HB 1337 (2023), codified at RCW 36.70A.681, directs GMA-planning jurisdictions like Yakima County to allow at least two accessory dwelling units on lots within urban growth areas that permit single-family homes. The county may not set a maximum ADU size below 1,000 square feet, may not require the owner to live on-site, and may not require off-street parking for ADUs within one-half mile walking distance of a major transit stop. Impact fees on an ADU are capped at 50 percent of those on the principal unit. Rural lots outside a UGA follow Yakima County's rural zoning. Any ADU still needs a building permit under the state building code.
Building or occupying an ADU without a county building permit is enforced under RCW 19.27 with stop-work orders. County provisions that conflict with RCW 36.70A.681 are unenforceable.
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