Shasta County, CA Accessory Structures: ADU Rules (2026)

(c)(2) Notwithstanding paragraph (1), a local agency shall not establish by ordinance any of the following: (A) A minimum square footage requirement for either an attached or detached accessory dwelling unit that prohibits an efficiency unit. (B) A maximum square footage requirement for either an attached or detached accessory dwelling unit that is less than either of the following: (i) 850 square feet. (ii) 1,000 square feet for an accessory dwelling unit that provides more than one bedroom. (C) Any other minimum or maximum size for an accessory dwelling unit, size based upon a percentage of the proposed or existing primary dwelling, or limits on lot coverage, floor area ratio, open space, and minimum lot size, for either attached or detached dwellings that does not permit at least an 800 square foot accessory dwelling unit that is at least 16 feet in height with four-foot side and rear yard setbacks to be constructed in compliance with all other local development standards. (d) Notwithstanding any other law, a local agency, whether or not it has adopted an ordinance governing accessory dwelling units in accordance with subdivision (a), shall not impose parking standards for an accessory dwelling unit in any of the following instances: (1) The accessory dwelling unit is located within one-half mile walking distance of public transit. (2) The accessory dwelling unit is located within an architecturally and historically significant historic district. (3) The accessory dwelling unit is part of the proposed or existing primary residence or an accessory structure. (4) When on-street parking permits are required but not offered to the occupant of the accessory dwelling unit. (5) When there is a car share vehicle located within one block of the accessory dwelling unit.