Structure Height Limits: Castro Valley vs Livermore
How do structure height limits rules compare between Castro Valley, CA and Livermore, CA?
Castro Valley and Livermore 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 →Livermore, CA
Alameda County
Livermore residential height limits are typically 30 ft / 2 stories in RL and RS zones; detached ADUs allowed up to 16-25 ft per state law.
View full Livermore rules →Key Facts Comparison
| Fact | Castro Valley | Livermore |
|---|---|---|
| R-1 height limit | 30 feet / 2.5 stories typical | - |
| Hillside zones | Often 25 feet maximum | - |
| Detached ADU | 16 feet (state law) | 16-25 ft state law |
| Measured from | Average natural grade | - |
| Rooftop equipment | May exceed with conditions | - |
| RL/RS Max | - | 30 ft / 2 stories |
| RM Max | - | 35 ft |
| Features | - | +3-5 ft with screening |
| Hillside | - | Ridgeline protection |
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.
Livermore FAQ
Can I build a 3-story house?
Not in most Livermore residential zones — 2 stories / 30 ft is the typical cap. Variances are rarely granted.
How tall can my ADU be?
Detached single-story ADU up to 16 ft; up to 18-25 ft if within half-mile of transit or on multifamily lot.
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