Clayton County's zoning ordinance sets no dedicated retaining-wall height limit. Retaining walls are structures needing a building permit, and Sec. 6.34 bars retaining walls from extending into any right-of-way or easement without written permission from the agency that established it.
Unlike ornamental or privacy fences, a true soil-retaining wall is not assigned its own height cap in the Clayton County Zoning Ordinance. The fence-and-wall table (Sec. 6.30) covers only decorative and obscuring walls; a retaining wall is treated as a structure and requires a building permit under the county's adopted building codes, with engineered plans typically required for taller or load-bearing walls. Sec. 6.34 (Landscaping Standards) expressly restricts placement: no retaining wall may extend into an existing or proposed right-of-way or easement without written permission from the controlling agency. Drainage, grading and buffer requirements elsewhere in the code also apply.
Building a retaining wall without the required permit or engineered plans, or letting one encroach on a right-of-way or easement, can bring a stop-work order, after-the-fact permit fees, and fines up to $1,000.
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