Structure Height Limits: Castro Valley vs San Leandro
How do structure height limits 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 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.
View full Castro Valley rules →San Leandro, CA
Alameda County
San Leandro caps residential height at 28-30 ft / 2 stories in RS zones. Accessory structures limited to 15 ft; ADUs to 16-25 ft per state law.
View full San Leandro rules →Key Facts Comparison
| Fact | Castro Valley | San Leandro |
|---|---|---|
| R-1 height limit | 30 feet / 2.5 stories typical | - |
| Hillside zones | Often 25 feet maximum | - |
| Detached ADU | 16 feet (state law) | - |
| Measured from | Average natural grade | - |
| Rooftop equipment | May exceed with conditions | - |
| RS height | - | ~28-30 ft / 2 stories |
| RM height | - | 35-40 ft |
| Accessory | - | ~15 ft |
| ADU height | - | 16-25 ft per state |
| FAA Part 77 | - | Airport proximity trigger |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Does a basement count toward height?
Generally no if it is below average natural grade, but a daylight basement that extends above grade on downslope sides may count as a story depending on exposure.
Can I add a second story to my Castro Valley home?
Yes if the finished structure stays within the zone height limit and does not violate hillside overlay restrictions. A building permit and often design review are required.
San Leandro FAQ
Can I build a 3-story house?
Not in most RS zones. Multifamily zones may allow taller buildings subject to design review.
Does Oakland Airport affect my project?
Tall structures in west San Leandro may require FAA Form 7460-1 notification.
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