Rialto, CA Building Setbacks & Zoning: Structure Height Limits (2026)

San Bernardino County Development Code establishes maximum building heights that vary by zoning district. Single-family residential (RS) and Multi-family Residential (RM) zones typically cap structures at 35 ft. Rural Living (RL) and Agricultural (AG) zones generally allow up to 50 ft for agricultural buildings like barns and silos. Commercial zones range from 35 to 55 ft depending on location. Height is measured from the finished grade at the base of the structure to the highest point of the roof, excluding certain appurtenances such as chimneys (up to 6 ft above roof), antennas, elevator shafts, and solar equipment. Hillside development overlay zones apply stricter limits based on slope, often reducing allowable height on slopes over 15 percent. Accessory structures are limited to 16 ft in most residential zones, and ADUs are capped at 16 ft for detached and 25 ft for structures above garages under state ADU law. Height variances require Planning Commission review. Mountain area communities like Lake Arrowhead and Big Bear have specific Community Plan height limits tied to resort and alpine character.