Structure Height Limits: Berkeley vs Castro Valley
How do structure height limits rules compare between Berkeley, CA and Castro Valley, CA?
Castro Valley has fewer restrictions than Berkeley.
Berkeley, CA
Alameda County
Berkeley caps residential heights at 28 feet in R-1 zones with average height 25 feet, while downtown zones permit high-rise buildings up to 180 feet under the Downtown Area Plan.
View full Berkeley rules →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 →Key Facts Comparison
| Fact | Berkeley | Castro Valley |
|---|---|---|
| R-1 max height | 28 feet | - |
| R-1 average | 25 feet | - |
| R-2 max | 35 feet | - |
| Downtown max | Up to 180 feet | - |
| ADU state law | 16-25 feet | - |
| 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 |
Highlighted rows indicate differences between cities.
Berkeley FAQ
Can I add a second story?
Yes within 28-foot height limit and applicable height planes; larger additions may require Use Permit and neighbor notice.
Are rooftop solar panels counted in height?
Panels generally may extend above height limits subject to reasonable design controls under Civil Code 714.
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.
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