2 county-level rules, plus city-specific rules for 1 city in Shasta County, California.
Verified from official government sources
Shasta County Code Section 17.88.132 governs Accessory Dwelling Units. ADUs are permitted by right in any zoning district that allows a one-family residence, as well as in the Mixed Use district. The county's ordinance was adopted in 2017 and updated to align with state law: ADUs are capped at 1,200 square feet or 50% of the primary residence (whichever is less), and the county offers seven pre-approved ADU designs free of charge.
Shasta County follows the California Building Code adopted under Title 15 of the County Code. Detached one-story accessory structures not exceeding 120 square feet of floor area are exempt from a building permit under California Residential Code Section R105.2. Sheds larger than 120 square feet require a building permit. All structures, regardless of size, must comply with setback requirements in Title 17 (Zoning), Chapter 17.84.
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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