San Bernardino, CA Accessory Structures: Shed Rules (2026)

Under California Residential Code Section R105.2, as adopted by the City of San Bernardino, one-story detached accessory structures used as tool or storage sheds are exempt from building permit requirements provided the floor area does not exceed 120 square feet. This permit exemption does not waive compliance with zoning and other codes. Under the San Bernardino Development Code, rear-yard accessory structures must typically be set back at least five feet from side and rear property lines, and any structure built up to the side or rear yard line requires non-combustible walls on that face. Maximum accessory-structure height in most residential zones is around 12 to 15 feet, lower when near property lines. Sheds may not exceed a specified percentage of rear-yard lot coverage, commonly 30 percent, and must not be placed in required front yards or on easements. Sheds larger than 120 square feet require a building permit, plan check, and foundation inspection, and anything with electrical, plumbing, or gas connections requires a separate permit regardless of size. In VHFHSZ foothill areas, sheds must meet Chapter 7A ignition-resistant construction if they are habitable or attached to a dwelling, and clearance from combustible vegetation must follow PRC 4291 defensible space. Prefabricated metal or resin sheds anchored per the manufacturer instructions typically satisfy anchorage requirements.