Columbia, SC Sign Regulations: Freeway-Facing Signs (2026)

Columbia's Unified Development Ordinance confines new outdoor advertising (billboard) signs facing the interstate system and freeway class highways to the Outdoor Advertising Sign Overlay (OV-OAS) District under Sec. 7(l), and governs their size and placement under Sec. 4. The overlay cannot be mapped over a residential base zoning district, and where it conflicts with the base district's standards, the OV-OAS standards control. A freeway-facing billboard must be freestanding only (never mounted on or suspended from a building), cannot be erected on a lot that already carries a nonconforming sign, and is capped at 672 square feet of display surface and 50 feet in height, measured from the highest curb elevation adjacent to the site, the largest and tallest allowance in the sign table, exceeding the 380-square-foot/35-foot cap for arterial-facing signs and the 248-square-foot/25-foot cap for collector-facing signs.

Signs on the same side of an interstate or freeway must be spaced at least 1,000 feet apart, and any sign must sit at least 500 feet from a separated-grade highway interchange ramp. Buffers apply citywide: no billboard within 1,000 feet of a riverbank, 750 feet of a historic district or historic property boundary, or 300 feet of a residential base zoning district (200 feet if oriented toward a collector street). A structure may carry at most two sign faces, which must be parallel or angled no more than 45 degrees apart, never stacked top-to-bottom or side-by-side.

Construction must meet the City building code's 30-pound-per-square-foot wind load standard. The Zoning Administrator may grant a height variance for freeway- or interstate-facing signs under Sec. 5(s), but no other standard in the section, and no variance whatsoever for collector- or arterial-facing billboards, may be waived. Replacement of an existing nonconforming billboard is governed separately by Sec. 5, Nonconforming Signs.