Charleston, SC Outdoor Lighting: Billboard Lighting (2026)

Section 54-410 sits in Part 3 of the sign article as the baseline rule for every sign type the zoning ordinance permits, freestanding, façade, window, and the off-premises billboards allowed under Section 54-415(n) alike. Subsection (b) requires that light sources used to illuminate a sign be shielded from all adjacent residential buildings and streets, and forbids brightness sufficient to cause glare hazardous to pedestrians or drivers, or to create a nuisance for adjacent residential districts. Subsection (c) adds a materials rule: a sign cannot use a light-reflecting background, though light-reflecting lettering is allowed.

Charleston layers additional illumination limits onto specific sign types rather than a single citywide brightness number: reader boards on monument signs are barred from internal illumination outside public schools under Section 54-415(a)(5)(c), and residential subdivision and multi-family identification signs cannot be internally illuminated under Section 54-404(j). For the off-premises billboards themselves, Section 54-415(n) sets no separate lighting standard beyond the Section 54-410 shielding and glare rule, so a new interstate billboard in the HI district must still meet the general shielding requirement. Older, non-conforming interstate billboards face a stricter freeze: Section 54-420(f)(3) bars adding illumination to any non-conforming Interstate System Road sign that was unlit on the ordinance's effective date, so a dark grandfathered billboard cannot later be lit up even if it otherwise qualifies to remain in place.