Setback Rules: Castro Valley vs Hayward
How do setback rules rules compare between Castro Valley, CA and Hayward, CA?
Castro Valley has fewer restrictions than Hayward.
Castro Valley, CA
Alameda County
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.
View full Castro Valley rules →Hayward, CA
Alameda County
Hayward single-family zones typically require 20-foot front setbacks, 5-foot side setbacks, and 20-foot rear setbacks. Hayward Fault Alquist-Priolo zone adds special setback requirements for habitable structures.
View full Hayward rules →Key Facts Comparison
| Fact | Castro Valley | Hayward |
|---|---|---|
| Governing code | Alameda County Code Title 17 | - |
| R-1 front setback | Typically 20 feet | - |
| R-1 side setback | Typically 5 feet minimum | - |
| ADU setbacks | 4 feet (state preemption) | - |
| Variance authority | Board of Zoning Adjustments | - |
| Front setback | - | 20 feet typical RS |
| Side setback | - | 5 feet typical |
| Rear setback | - | 20 feet typical |
| Fault zone | - | 50 ft from active trace |
| ADU setback | - | 4 ft side/rear state law |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Do cities in Alameda County follow the same setbacks?
No. Incorporated cities like Oakland, Fremont, and Berkeley have their own zoning codes. Only unincorporated areas (Castro Valley, San Lorenzo, etc.) use Alameda County Title 17.
Can I build an ADU closer than zoning allows?
Yes. California Gov Code 65852.2 preempts local setbacks to 4 feet side and rear for ADUs regardless of the base zoning requirement.
Hayward FAQ
Do I need a fault study to build in Hayward?
If your property is within the Alquist-Priolo zone along the Hayward Fault, yes, a geologic investigation is required.
Can I build an ADU closer to the property line?
Yes, state ADU law allows 4-foot side and rear setbacks for ADUs regardless of base zoning.
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