Hayward, CA Accessory Structures: Shed & Carport Rules (2026)

Under Hayward Municipal Code Sec. 204(a), Minimum Design Standards Applicable to All Districts, a detached accessory building, defined to include carports, garages, greenhouses, freestanding patio covers and sheds, must meet a sliding setback scale keyed to footprint. A shed of 120 square feet or less needs only a 3-foot setback from side and rear property lines; anything larger than 120 square feet must sit back a full 5 feet from those same lines. Every accessory building, regardless of size, must also keep a minimum 5-foot separation from any other structure on the lot.

The ordinance bars placement in a required front yard or side street yard, and bars sheds from standing in front of the primary house, though it carves out an exception for detached carports and garages that can sit forward. Cumulatively, all accessory buildings on a lot cannot exceed 50 percent of the ground floor area of the primary building, a hard ceiling the Planning Division checks against the house's own footprint at permit review. The code also regulates materials and use: metal or plywood accessory structures must be painted, and while a shed may include a bathroom, it cannot contain a kitchen or a bedroom, keeping it from functioning as a second dwelling.

The section expressly carves out accessory dwelling units from these standards, sending ADU projects instead to the separate ADU rules at Sec. 2740, since state ADU law under Gov. Code Sec. overrides local size and setback limits for those units. A homeowner planning a shed near the 120-square-foot line should measure footprint first, since crossing that threshold nearly doubles the required side and rear clearance from 3 to 5 feet.