Dark Sky Rules: Mountain View vs Sunnyvale
How do dark sky rules rules compare between Mountain View, CA and Sunnyvale, CA?
Mountain View and Sunnyvale have similar restriction levels.
Mountain View, CA
Santa Clara County
Mountain View requires shielded outdoor lighting for new commercial and multi-family developments to minimize glare and skyglow. Title 24 Part 6 lighting efficiency standards apply to all new construction.
View full Mountain View rules →Sunnyvale, CA
Santa Clara County
Sunnyvale limits outdoor lighting glare and spill through SMC Title 19 and Title 24 Part 6. Fixtures in residential zones must be shielded and not spill onto adjacent properties.
View full Sunnyvale rules →Key Facts Comparison
| Fact | Mountain View | Sunnyvale |
|---|---|---|
| Shielding requirement | Fully shielded downward | - |
| Residential spillover | 0.5 foot-candles max | - |
| Commercial spillover | 2.0 foot-candles max | - |
| Closing reduction | Within 30 minutes | - |
| Title 24 controls | LED with auto controls | - |
| Code basis | - | Title 19 + Title 24 Part 6 |
| Fixture type | - | Full-cutoff/hooded |
| Commercial curfew | - | Typically 10 pm - 6 am |
| Holiday lights | - | Usually exempt |
| Enforcement | - | Code Enforcement |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Are holiday lights regulated?
Temporary decorative holiday lighting is exempt from shielding requirements but should not shine directly into neighbor windows. Displays typically run November through January without restriction.
Can my neighbor install a bright floodlight?
Residential floodlights must not cast direct glare across property lines. Report persistent light trespass to Code Enforcement; shielding or motion sensors often resolve complaints.
Sunnyvale FAQ
Can I install bright floodlights in my yard?
Only if shielded so light does not spill beyond the property line and meets Title 24 lumen limits.
Are seasonal lights regulated?
Temporary holiday lighting is generally allowed if used for a reasonable seasonal period.
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