Unincorporated Alameda County sets minimum front, side, and rear yard setbacks by zoning district under Title 17. Cities like Oakland, Fremont, Berkeley, Hayward, and Livermore adopt their own standards.
Alameda County Code Title 17 (Zoning) governs setbacks in unincorporated areas including Castro Valley, San Lorenzo, Ashland, Cherryland, and Sunol. Typical R-1 single-family zones require 20-foot front setbacks, 5-foot side setbacks, and 20-foot rear setbacks, though requirements vary by specific zone (R-1-CSU, R-S, etc.). Corner lots must observe street-side setbacks. ADUs have reduced setbacks under state law (4 feet side and rear per Gov Code 65852.2). Variances require findings by the County Board of Zoning Adjustments. Nonconforming structures may remain but cannot be expanded into required setbacks. Hillside properties in Castro Valley canyons have additional setback requirements tied to slope stability and fire access.
Contact your local code enforcement office for specific penalty information.
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See how Alameda County's setback rules rules stack up against other locations.
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