Light Trespass: Berkeley vs Castro Valley
How do light trespass rules compare between Berkeley, CA and Castro Valley, CA?
Berkeley and Castro Valley have similar restriction levels.
Berkeley, CA
Alameda County
Berkeley Zoning Ordinance Title 23 prohibits outdoor lighting that creates glare or excessive illumination onto neighboring properties, with civil remedies under state nuisance law.
View full Berkeley rules →Castro Valley, CA
Alameda County
Alameda County treats light trespass onto neighbors as nuisance under Title 17 and Civil Code 3479. Residential fixtures cannot exceed 0.5 foot-candles at adjacent property lines.
View full Castro Valley rules →Key Facts Comparison
| Fact | Berkeley | Castro Valley |
|---|---|---|
| Property line limit | 0.1 fc residential | - |
| Complaint path | Code Enforcement | - |
| State remedy | Civil Code 3479 | - |
| Security lights | Shielded or motion | - |
| Code | Title 23 | - |
| Residential limit | - | 0.5 foot-candles at line |
| Commercial limit | - | 1.0 foot-candle typical |
| Nuisance law | - | Civil Code 3479 |
| Required | - | Shielded, downward-directed |
| Motion sensors | - | 5-10 minute timers OK |
Highlighted rows indicate differences between cities.
Berkeley FAQ
My neighbor floodlight shines in my bedroom - what can I do?
Try informal resolution first, then file a code enforcement complaint with Berkeley Planning for light trespass.
Can I sue for light pollution?
Yes, civil nuisance actions under Civil Code 3479 are possible for unreasonable light interference.
Castro Valley FAQ
My neighbor's security light shines into my bedroom. What can I do?
Ask politely first, then file a code enforcement complaint with Alameda County or your city. Document with photos showing intrusion. Private nuisance suits are also available under Civil Code 3479.
Can I use bright LED security flood lights?
Yes, but they must be shielded to direct light onto your property only and not exceed 0.5 foot-candles at neighbor property lines. Motion-activated fixtures are preferred over always-on lighting.
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