Iowa City, IA Outdoor Lighting: Light Trespass & Shielding (2026)

Section 14-5G-4C, "Light Trespass," sits inside article G of chapter 5 of the zoning title, the article that sets Iowa City's whole outdoor lighting scheme. The stated purpose of the subsection is to keep light from one property from extending past its boundary onto the neighbor's land, and the code lists five compliance tools a property owner can use together or separately: fixture shielding, directional control built into the fixture, fixture location, fixture height, and fixture aim.

The numeric limit is specific: illumination cannot exceed 0.5 initial horizontal foot-candle as a baseline, or 2.0 initial maximum foot-candles, measured at any point along a property line that touches or sits across the street from a residential zone, CN-1, CO-1, or a Neighborhood Form-Based Zone. The city can raise that baseline to 1.0 foot-candle for lighting a building code requires on a building close to the property line, but only if the fixture is still located and shielded to be as unobtrusive as possible to abutting residential property.

Floodlighting gets its own rule: it is prohibited outright except for loading areas, service areas, and architectural emphasis lighting, and it is never allowed to illuminate parking or outdoor product display areas. Where floodlights are allowed, they must be aimed no more than 45 degrees from vertical. The code also requires that no bulb be directly visible from an adjacent residential use or the public right of way, though that right-of-way rule does not apply in the CB-2, CB-5 or CB-10 downtown commercial zones, and multi-family or group living properties must keep their fixtures out of view from any residential window on the site.