Alameda County limits residential structure heights to 30-35 feet in most R-1 zones under Title 17, with stricter limits in hillside overlays. ADUs are capped at 16-18 feet per state law.
Height limits in unincorporated Alameda County vary by zoning district. Standard R-1 single-family zones typically allow 30 feet or 2.5 stories, whichever is less. Hillside overlay zones in Castro Valley and unincorporated canyons impose stricter limits (often 25 feet) to preserve ridgelines and views. Accessory dwelling units are capped at 16 feet for detached units and 18 feet for units near transit or on multifamily lots, per California Gov Code 65852.2. Commercial zones allow taller structures based on use and district. Height is measured from average natural grade. Rooftop equipment, chimneys, and antennas may exceed the base limit with restrictions. The Board of Zoning Adjustments considers height variances when strict application creates hardship.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle structure height limits.
See how Castro Valley's structure height limits rules stack up against other locations.
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