Alhambra, CA Accessory Structures: Shed Rules (2026)

The City of Alhambra treats sheds as detached accessory structures, governed by the citywide residential development standards in the Zoning Code (Title 23). According to City development-standards guidance, one-story detached accessory buildings used as tool and storage sheds, playhouses, shade structures and similar uses are permitted provided the gross floor area does not exceed 120 square feet and the height does not exceed 12 feet. Accessory structures generally may not exceed 15 feet in height. Detached accessory structures must be set back a minimum of three feet from any interior side or rear lot line, and structures under 4 feet tall may extend into a street-side setback but no closer than 3 feet from the lot line. Collectively, accessory structures may not occupy more than 40 percent of the required rear-yard setback area. A detached accessory structure may only be built on a lot that already has a permitted main building. New accessory structures and expansions are typically subject to Minor Site Plan Review, and Design Review Board approval may be required depending on the project, location, and zone district. Even small sheds may require a building permit; property owners should confirm with the Planning Division (626-570-5034) before construction, since California building-code thresholds and city zoning both apply.