Castro Valley STRs have no dedicated occupancy cap, but the unit must comply with California Building Code occupancy standards and Alameda County zoning use limits for the underlying single-family or multi-family district.
Because there is no Castro Valley STR ordinance, occupancy is governed by the California Building Code and the unit's zoning. CBC §R310 sets minimum sleeping room size (70 sq ft for one occupant + 50 sq ft per additional) and emergency egress requirements. Alameda County zoning treats short-term rental as a residential use; running a property as a quasi-hotel can be flagged as a change of use requiring a conditional use permit. Castro Valley HOAs and CC&Rs frequently impose stricter occupancy or outright STR bans, which the County does not enforce but homeowners must follow.
Overcrowding violations can be cited by Code Enforcement under §6.65.030 (real property nuisance) or by the Building Department under the CBC. Repeated guest-related disturbances may also trigger Chapter 6.60 noise actions.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Castro Valley, CA
Alameda County Code §6.60.050 prohibits repairing, rebuilding, modifying or testing vehicles in residential areas between 7 p.m. and 7 a.m. if it produces so...
Castro Valley, CA
Alameda County Code §6.60.050 limits use of electric or gas leaf blowers, sweepers, vacuums, mowers, trimmers, edgers and hedgers in residential areas to 7 a...
Castro Valley, CA
Alameda County Code §5.08.060 makes it unlawful for any person owning, keeping, or having custody of a dog or other animal to knowingly permit or suffer that...
Castro Valley, CA
Alameda County Code §6.60.080 exempts construction activity from Chapter 6.60 only if it occurs between 7 a.m.-7 p.m. on weekdays and 8 a.m.-5 p.m. on Saturd...
Castro Valley, CA
Castro Valley is unincorporated and operates under Alameda County Code Chapter 6.60 (Noise). §6.60.050 makes it a violation to operate any sound-producing de...
Castro Valley, CA
Heavy commercial vehicles - generally over 10,000 lbs GVW or 22 feet long - cannot be parked overnight on Castro Valley residential streets, and cannot be pa...
Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle occupancy limits.
See how Castro Valley's occupancy limits rules stack up against other locations.
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