Shed permit rules in Clackamas County, OR — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
In unincorporated Clackamas County, ZDO Section 315 sets accessory-building setbacks. A shed behind the building line under 100 sq ft and 8 feet tall needs no setback; larger sheds need 3-5 ft side/rear setbacks. Sheds over 200 sq ft need a building permit.
Detached sheds, shops and similar accessory buildings in the unincorporated county follow the dimensional standards in ZDO Section 315. When an accessory building sits behind the building line of the main house, its rear and side setbacks scale with its size and height: a structure 100 sq ft or less and no taller than 8 feet needs no setback; between 8 and 10 feet it needs 3 feet on the sides and rear; taller or larger sheds need 5-foot side and up to 10-foot rear setbacks. Accessory buildings larger than 500 sq ft are limited to 20 feet in height or the height of the primary dwelling, whichever is greater. Under Oregon's building code a shed 200 sq ft or
Building a shed that violates setbacks or exceeds height limits without permits can trigger county Code Enforcement action, correction orders, and removal of noncompliant structures.
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See how Clackamas County's shed rules rules stack up against other locations.
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