Light Trespass: Castro Valley vs Fremont
How do light trespass rules compare between Castro Valley, CA and Fremont, CA?
Castro Valley and Fremont have similar restriction levels.
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 →Fremont, CA
Alameda County
Fremont prohibits outdoor lighting that causes glare or illumination spillover onto adjacent properties, enforceable through code enforcement nuisance provisions.
View full Fremont rules →Key Facts Comparison
| Fact | Castro Valley | Fremont |
|---|---|---|
| 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 | - |
| Property Line Limit | - | 0.5 foot-candles typical |
| Security | - | Motion or shielded |
| Commercial | - | Off/dim after hours |
| Prohibited | - | Lasers, flashing |
| Contact | - | (510) 494-4430 |
Highlighted rows indicate differences between cities.
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.
Fremont FAQ
My neighbors floodlight shines into my bedroom - what can I do?
File a complaint with Fremont Code Enforcement; provide photos and the fixture location for investigation.
Are holiday laser projectors allowed?
Short-duration seasonal use is tolerated, but beams that trespass onto neighbors or roads violate nuisance rules.
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