Setback Rules: Castro Valley vs Fremont
How do setback rules rules compare between Castro Valley, CA and Fremont, CA?
Castro Valley and Fremont have similar restriction levels.
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 →Fremont, CA
Alameda County
Fremont requires typical 20-foot front, 5-foot side, and 20-foot rear setbacks in R-1 zones, with reductions for ADUs under state law SB 9 and AB 2221.
View full Fremont rules →Key Facts Comparison
| Fact | Castro Valley | Fremont |
|---|---|---|
| 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 | - |
| R-1 Front | - | 20 feet typical |
| R-1 Side | - | 5 feet interior |
| R-1 Rear | - | 20 feet typical |
| ADU Setback | - | 4 feet side/rear |
| Contact | - | (510) 494-4455 |
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.
Fremont FAQ
Can I build right up to the property line?
Only detached ADUs under state law get 4-foot setbacks; primary dwellings must meet full zone setbacks.
Can I get a setback variance?
Yes through Planning Commission review, but variances require showing hardship unique to the lot.
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