Louisville's Outdoor Lighting: The Rules That Matter
Every city handles outdoor lighting a little differently. In Louisville, Kentucky, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.
Billboard Lighting
Louisville Metro allows illuminated billboards up to 330 square feet only along major or minor arterial highways in commercial and industrial districts, with tighter setbacks, spacing, and height limits than unlit billboards under the Land Development Code.
Key details: Illuminated size cap: 330 sq ft in C-1 to M-3. Unlit size cap: 72 sq ft, no arterial required. Height limit: 40 ft (35 ft in C-1). Absolute size cap: 750 sq ft, any district. Governing code: Land Development Code § 4.3.12.
Building a billboard over 330 square feet without meeting the arterial-highway, setback, spacing, and height rules, or any billboard over 750 square feet, draws a stop-work order and code enforcement citation from Planning and Design Services.
Light Trespass & Shielding
Louisville Metro caps spillover light at 0.25 footcandles on low- to medium-density residential borders and 0.5 footcandles on high-density or right-of-way borders.
Key details: Low/medium-density residential cap: 0.25 footcandles at property line. High-density residential/ROW cap: 0.5 footcandles at property line. General rule: no light may shine directly onto adjoining property. Governing code: Land Development Code Ch. 4 Part 1. Applies to: Louisville Metro zoned parcels.
Inspectors take a footcandle reading at the property line with an approved light meter; readings above the cap are a code violation enforced through Planning & Design Services' zoning enforcement process, which can require fixture shielding, re-aiming, or removal.
Dark Sky Rules
Louisville Metro caps light trespass at property lines and requires bright fixtures to be fully shielded under the Land Development Code.
Key details: Shielding trigger: Over 3,500 lumens. Residential trespass limit: 0.25 footcandles at property line. High-density residential limit: 0.5 footcandles at property line. Banned outright: Search lights, drop-lens, strobe fixtures.
Enforced through the permit review process and light-trespass complaints; inspectors take footcandle readings at the property line with a handheld meter and can require fixtures be re-aimed, re-shielded, or removed to meet the 0.25/0.5 footcandle limits.
The Bottom Line
Louisville'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 Louisville is broadly strict or permissive.
Keep in mind that Louisville can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.