ADU Rules: Castro Valley vs San Leandro
How do adu rules rules compare between Castro Valley, CA and San Leandro, CA?
Castro Valley and San Leandro have similar restriction levels.
Castro Valley, CA
Alameda County
Alameda County complies with California Government Code 65852.2 mandating ministerial ADU approval. ADUs up to 1,200 sqft for detached and JADUs up to 500 sqft are allowed on most residential lots.
View full Castro Valley rules →San Leandro, CA
Alameda County
San Leandro must allow ADUs citywide under CA Gov Code 65852.2. Up to 1,200 sq ft detached or 50 percent of primary for attached, with streamlined ministerial approval.
View full San Leandro rules →Key Facts Comparison
| Fact | Castro Valley | San Leandro |
|---|---|---|
| State law | Gov Code 65852.2 | - |
| Detached ADU max | 1,200 sqft | - |
| JADU max | 500 sqft | - |
| Side/rear setback | 4 feet | - |
| Review time | 60 days ministerial | - |
| Max Size | - | 1,200 sq ft detached |
| Setbacks | - | 4 ft side/rear |
| Review | - | 60 days ministerial |
| Parking | - | None near transit |
| JADU | - | Up to 500 sq ft |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Do I need a public hearing?
No, ADUs are approved ministerially by county staff under state law; no planning commission or neighbor notice is required if the application meets objective standards.
Can I sell my ADU separately?
AB 1033 (2023) allows separate sale as condominium only if Alameda County opts in by local ordinance; check current county policy.
San Leandro FAQ
Can San Leandro reject my ADU if it meets state standards?
No. If your ADU meets Gov Code 65852.2 standards, approval is ministerial and must be issued within 60 days.
Do I need to add parking for my ADU?
Not if the property is within half a mile of public transit, which covers most of San Leandro near BART and AC Transit corridors.
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