Shed permit rules in Benton County, WA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
A one-story detached shed of 200 square feet or less needs no building permit in unincorporated Benton County under the 2021 state building code (WAC 51-51), but it must still meet county setbacks and stay unheated and uninhabited.
The 2021 IRC as adopted in Washington (WAC 51-51, RCW 19.27) exempts a one-story detached accessory structure — a tool or storage shed, playhouse, or similar — from a building permit when its floor area is 200 square feet or less. Benton County's building official applies this exemption. It is only a permit exemption: the shed must still meet the zone's accessory-structure setbacks, stay subordinate to the house, and be anchored against the winds that sweep the Columbia Basin. A shed over 200 square feet, or one with plumbing, fixed wiring, or heating, needs a permit, and any fixed wiring needs a separate L&I electrical permit. Sheds may not be used as living quarters.
A shed over 200 square feet, or any shed with fixed wiring or plumbing, built without a permit draws a stop-work order and doubled fees. A shed in a required setback must be moved.
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See how Benton County's shed rules rules stack up against other locations.
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