2 county-level rules, plus city-specific rules for 1 city in Williamson County, Tennessee.
Verified from official government sources
Tennessee has no dark-sky statute, but Williamson County's Zoning Ordinance (Section 16.03) requires downward-directed lighting and full cut-off fixtures over 1,000 lumens on nonresidential and site-plan projects. Single-family homes are exempt. Brentwood and Franklin add city standards.
Williamson County Zoning Ordinance § 16.03(B)(6)
Light fixtures in excess of 1,000 lumens shall use full cut-off lenses or hoods to prevent glare or spillover onto adjacent parcels and streets.
Williamson County's Zoning Ordinance bars exterior lighting from shining into a neighbor's yard or windows and caps illumination at the property line at 0.2 footcandles for site-plan uses. Single-family homes rely on city rules or a nuisance claim.
Williamson County Zoning Ordinance § 16.03(B)(5)
Exterior lighting shall not shine directly into the yard or windows of adjacent residential uses.
1 cities in Williamson County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
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Williamson County Ordinance Hub →