Clackamas County, OR Accessory Structures: Shed & Carport Rules (2026)
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.
Key Facts
- Setback rule
- ZDO Section 315 (dimensional)
- Under 100 sq ft, <=8 ft
- No setback required
- Typical side setback
- 3-5 feet
- Over-500-sq-ft height cap
- 20 ft or primary dwelling
- Building permit
- Generally needed over 200 sq ft
Summary
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.
If an accessory building is located behind the building line of the main building, the applicable minimum rear and side setback standards for that accessory building are based on the accessory building area and accessory building height... 100 square feet or less, 8 feet or less: None.
Full Breakdown
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.
Violations & Fines
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.
Frequently Asked Questions
Does a small shed need a setback?
Do I need a building permit for a shed?
Sources & Official References
Other rules in Clackamas County
How Clackamas County compares: Shed Permit Requirements by City·Compare Clackamas County to another location·View the Oregon accessory structures overview
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