Riverside County, CA Permit Requirements: Shed & Outbuilding Permits (2026)

Under the California Building Code as adopted by Riverside County, one-story detached accessory structures used as tool or storage sheds, playhouses, or similar purposes are exempt from building permits if the floor area does not exceed 120 square feet. Exempt sheds must not contain plumbing, electrical systems, or mechanical equipment. Even exempt sheds must comply with Riverside County zoning setback requirements under Ordinance No. 348 — typically 5 feet from side and rear property lines in residential zones. Sheds exceeding 120 square feet require a building permit, which involves submitting plans to the County Building and Safety Department showing compliance with structural, fire separation, and setback requirements. Pre-fabricated sheds may still require a permit if over 120 sq ft. In fire-prone areas of Riverside County (which includes much of the western county hills and mountain communities), accessory structures may need to comply with Chapter 7A of the California Building Code for wildfire resistance, including non-combustible exterior materials and defensible space clearance.