Greenville County sets no general residential retaining-wall height in its zoning code, but structural retaining walls are subject to the county Building Permit rule, and the Land Development Regulations bar walls that obstruct intersection sight triangles or sit in public rights-of-way.
There is no district-wide maximum retaining-wall height in the Greenville County Zoning Ordinance for ordinary residential lots. However, Section 3:6 requires a Building Permit before a structure is erected or altered, which the Building Safety Department applies to engineered retaining walls under the adopted building codes. The Land Development Regulations also prohibit above-ground structures such as retaining walls within a public road right-of-way or landscaped island, and forbid any structure over 30 inches that obstructs an intersection sight triangle. Confirm engineering and permit thresholds with Building Safety before construction.
Building a wall without a required permit, in a right-of-way, or blocking a sight triangle violates the code; misdemeanor penalties apply under Sec. 13:3 and the county may remove sight-obstructing objects.
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