Shed permit rules in Multnomah County, OR β also referred to as storage shed, backyard shed, or accessory building regulations β set size limits, setbacks, and when a building permit is required.
Sheds under 200 sq ft and under 10 ft height do not require a structural building permit in unincorporated Multnomah County per ORSC. Zoning code setback and lot coverage requirements still apply. Sheds with electrical/plumbing require trade permits.
Oregon Residential Specialty Code exempts non-habitable detached one-story accessory structures of 200 sq ft or less from structural building permits in unincorporated Multnomah County. Multnomah County Zoning Code Chapter 39 setback and lot coverage requirements apply to all accessory structures regardless of permit status. Sheds with electrical, plumbing, or mechanical work require trade permits. Accessory structures within setbacks that are not enclosed must be screened from adjoining lots by fence or landscaping. Sheds cannot have rooftop decks; dormers must be set back at least 5 feet from side and rear lot lines. Contact Building Codes Division: 503-988-3000.
Unpermitted structure: retroactive permit with penalty. Non-compliant setback: modification or removal.
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