Outdoor Lighting in Williamson County, TN (2026)
2 county-level rules, plus city-specific rules for 1 city in Williamson County, Tennessee.
Verified from official government sources
Dark Sky Rules
Non-residential development in unincorporated Williamson County must aim outdoor light fixtures downward and shield anything over 1,000 lumens with a full cut-off lens or hood. The rule, reviewed at Site Plan submission with a photometric plan, exempts mobile homes, single-family dwellings and street lighting.
Williamson County Outdoor Lighting Shielding Rules
Some RestrictionsWilliamson County, TN, Zoning Ordinance Sec. 16.03(B)(2), (4), (6), (7)
(2) No flickering or flashing light shall be permitted. (3) Light sources or luminaires shall not be located within required bufferyards except for pedestrian-scaled lighting along walkways. (4) All lighting shall be directed downward except for low-wattage architectural lighting intended to illuminate structures. ... (6) Light fixtures in excess of 1,000 lumens shall use full cut-off lenses or...
Light Trespass & Shielding
Exterior lighting on covered development in unincorporated Williamson County cannot shine directly into a neighbor's yard or windows, and illumination measured at any property line is capped at 0.2 footcandles. Wall packs, floodlights and spotlights all carry their own shielding rules to keep the beam off adjoining land.
Williamson County Light Trespass Rules
Some RestrictionsWilliamson County, TN, Zoning Ordinance Sec. 16.03(B)(5), (C)(3)-(4)
(5) Exterior lighting shall not shine directly into the yard or windows of adjacent residential uses. ... a) Wall-mounted lights shall be fully shielded luminaires (such as shoebox or can style fixtures) to prevent the light source from being visible from any adjacent residential property or public street right-of-way. ... b) Such lighting shall be installed in a fixture that is shielded so tha...
Outdoor Lighting by City in Williamson County
1 cities in Williamson County have their own outdoor lighting rules. Each link goes to that city's dedicated page with code citations.
All Williamson County ordinances
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