Dublin, CA Outdoor Lighting: Light Trespass (2026)

Dublin does not have a separate ordinance setting a measured light-trespass threshold (for example, a maximum foot-candle reading at a property line). Instead, light trespass is controlled through the objective design standards in Chapter 8.36 (Development Regulations). Section 8.36.020 provides that residential light fixtures shall be designed to direct light downward and shall be shielded from off-site view, and that fixtures shall be mounted below the second story of two-story homes unless otherwise required by the Building Code. The practical effect is to require shielding and downward aiming so that light does not spill onto adjacent homes or the public realm. For new construction, additions, and larger projects, the City can also require lighting plans and shielded fixtures through Site Development Review (Chapter 8.104). Because the standard is qualitative (downward direction and off-site shielding) rather than a numeric lux limit, disputes between neighbors over glare or spillover are typically handled by Code Enforcement evaluating whether fixtures comply with the direct-downward and shielded-from-off-site requirement. Residents experiencing light trespass from a neighbor's fixtures can report the issue to Dublin Code Enforcement at (925) 833-6620, and those installing new lighting should confirm shielding and mounting compliance with the Planning Division at (925) 833-6610. Where state-mandated lighting (such as required egress or Building Code lighting) conflicts, the Building Code controls the mounting standard.