Outdoor Lighting in San Ramon, CA: What Residents Actually Need to Know
If you live in San Ramon or are thinking about moving there, outdoor lighting are one of those things you probably won't think about until they affect you directly. San Ramon has 2 specific rules on the books covering different aspects of outdoor lighting, and some of them might surprise you.
Light Trespass
San Ramon Development Code limits light glare and spillover from private lighting onto neighboring properties and public rights-of-way. Typical standards require illumination at property lines not to exceed 0.5–1.0 foot-candles for residential-adjacent properties, with full-cutoff fixtures required to prevent direct view of light sources from off-site. Violations are handled through code enforcement and may also give rise to civil nuisance claims. Security lighting is allowed but must be shielded and ideally motion-activated.
Key details: Typical Limit: Typical limit: 0.5 fc at residential property lines. Full-cutoff Fixtures Visible: Full-cutoff fixtures required visible from residences. Security Lighting Must: Security lighting must be shielded/motion-activated. Civil Code 3479: Civil Code 3479 nuisance claim available separately. Commercial Photometric Plans: Commercial photometric plans required for design review.
Contact your local code enforcement office for specific penalty information.
Dark Sky Rules
San Ramon regulates outdoor lighting through its Development Code (Title D) to reduce light pollution, glare, and spillover onto adjacent properties. Requirements include shielded fixtures, downward-directed light, and limits on lumens and color temperature (typically 3000K or below preferred). The city is not a formal IDA Dark Sky community but incorporates dark-sky principles in design review for new development, especially near open space preserves (Bishop Ranch Regional Preserve, Las Trampas).
Key details: Shielded And: Shielded and downward-directed fixtures required. Photometric Review: Photometric review required for commercial projects. 3000K Lower: 3000K or lower color temp preferred for LEDs. Special Standards: Special standards near open space preserves. Exceptions: Holiday lighting generally exempt for seasonal period.
Contact your local code enforcement office for specific penalty information.
The Bottom Line
San Ramon's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming San Ramon is broadly strict or permissive.
This guide is based on San Ramon's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.