5 county-level rules, plus city-specific rules for 1 city in Shasta County, California.
Verified from official government sources
In unincorporated Shasta County, ADUs are regulated by Zoning Code Section 17.88.132. One ADU is allowed per legal lot in any district permitting a one-family residence (plus the Mixed-Use district). State ADU law (Gov. Code 66310 et seq.) also guarantees ministerial, near-by-right approval of a state-exempt ADU.
California Government Code section 65852.2(c)(2) and (d) - state ADU law (controls Shasta County ADU permitting)
(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 squ...
Storage sheds in unincorporated Shasta County are 'residential accessory buildings' under Zoning Code Section 17.88.140. The combined floor area of all accessory structures on a lot with a home may not exceed 2,500 square feet, and up to two detached structures under 120 square feet each are excluded from that total. Sheds use the zone district's yard setbacks.
Shasta County Code section 17.88.140 (Residential accessory buildings), subsections A and B
17.88.140: Residential accessory buildings. A. Residential accessory buildings are buildings which are subordinate to and commonly associated with a residence, including, but not limited to: private garages, carports, covered awnings, greenhouses, and private storage buildings. As used in this section, residential accessory buildings include the terms 'residential accessory structure' and 'acce...
Converting a garage into living space in unincorporated Shasta County is treated as creating an ADU under Zoning Code Section 17.88.132. A key benefit: when an existing, legally established conforming garage is converted to an ADU, Section 17.88.132(D)(4)(a) requires no additional setbacks, and state ADU law (Gov. Code 66323) mandates ministerial approval of such conversions.
California Government Code section 65852.2(a)(1)(D)(iii), (vii), and (xi) - garage and accessory-structure conversion to ADU
(D) Require the accessory dwelling units to comply with all of the following: ... (iii) The accessory dwelling unit is either attached to, or located within, the proposed or existing primary dwelling, including attached garages, storage areas or similar uses, or an accessory structure or detached from the proposed or existing primary dwelling and located on the same lot as the proposed or exist...
Carports in unincorporated Shasta County are 'residential accessory buildings' under Zoning Code Section 17.88.140, which expressly lists carports and covered awnings. They are permitted in any district allowing a residence, count toward the 2,500-square-foot combined accessory-structure cap, and must meet the underlying zone district's setback and height limits.
Unincorporated Shasta County has no standalone 'tiny home' ordinance; treatment depends on form. A permanent tiny dwelling on a foundation is an ADU (Section 17.88.132); a small detached unit with no kitchen is a guest house (Section 17.88.185, max 640 sq ft); a tiny home on wheels is a trailer/RV, allowed only temporarily (Section 17.88.160).
1 cities in Shasta County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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