Riverside, CA Accessory Structures: Shed Rules (2026)

Under the California Residential Code (locally adopted in Riverside), one-story detached accessory buildings used as tool sheds, playhouses, or similar uses that don't exceed 120 square feet of floor area are exempt from building permits. Structures larger than 120 square feet, or any shed with electrical, plumbing, or mechanical service, require full building permits and plan review. Even permit-exempt sheds must still comply with zoning setbacks in RMC Chapter 19.530: typically 3 feet from side and rear property lines in single-family zones (some zones require 5 feet), no encroachment into front yards, and maximum height of 12 feet for sheds under 120 sq ft. Sheds cannot cover more than a specified percentage of the rear yard (commonly 30 percent) and cannot be closer to the street than the main dwelling. Materials and finishes should be compatible with the primary residence under design standards in some overlay zones, particularly in historic districts like the Mission Inn area or Mount Rubidoux. A shed may not be used as a dwelling unit (no sleeping, no bathroom, no kitchen) — if habitation is desired, the structure must be permitted as an ADU and meet all habitable-space standards. Sheds with electrical service require an electrical permit regardless of size. Placement over easements (utility, drainage) is prohibited, and in the Very High Fire Hazard Severity Zone the shed may need ignition-resistant exterior materials. Prefabricated sheds from retailers meet these rules if properly sited.