Light Trespass: Cambridge vs Somerville
How do light trespass rules compare between Cambridge, MA and Somerville, MA?
Cambridge and Somerville have similar restriction levels.
Cambridge, MA
Middlesex County
Cambridge prohibits outdoor lighting that creates nuisance glare or spills onto neighbor property in excess of zoning limits, with enforcement through Inspectional Services and nuisance law.
View full Cambridge rules →Somerville, MA
Middlesex County
Somerville zoning limits light trespass at residential property lines to 0.1 foot-candles. Complaints are handled by ISD zoning enforcement.
View full Somerville rules →Key Facts Comparison
| Fact | Cambridge | Somerville |
|---|---|---|
| Residential limit | 0.1 fc at line | 0.1 fc at property line |
| Direct illumination | Must stay on-site | - |
| Complaints | iReport or 311 | - |
| Color temp | Under 3000K preferred | - |
| Holiday lights | Generally tolerated temporarily | - |
| Commercial limit | - | 0.5 fc at property line |
| Shielding | - | Lamp not visible from neighbor |
| Aim | - | 30 degrees below horizontal |
| Fine | - | Up to $300 per day |
Highlighted rows indicate differences between cities.
Cambridge FAQ
My neighbor's light shines in my window. What can I do?
File an iReport complaint with Inspectional Services; Cambridge zoning limits light trespass across property lines.
Are security floodlights allowed?
Yes if shielded and aimed so illumination stays on your property and does not glare onto neighbors.
Somerville FAQ
My neighbor's security light shines into my bedroom. What can I do?
Call Somerville 311 to file a light trespass complaint. ISD will measure and, if over the limit, order the neighbor to shield or reaim. Keep photos and dates for documentation.
Does motion-activated lighting get a pass?
Motion lights are encouraged over all-night lighting, but they still must be shielded and comply with the property-line limit during activation.
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