Phila. Code §14-706 regulates retaining walls as part of fencing and wall standards. Any portion of a retaining wall above the higher grade level must comply with fence height requirements. Where a fence sits atop a retaining wall, the combined height cannot exceed the maximum permitted fence height.
Philadelphia regulates retaining walls to ensure structural safety and proper drainage. Walls up to 4 feet typically do not require a permit. Walls over 4 feet require a building permit and may need engineered plans stamped by a licensed professional engineer. Surcharge loads from driveways, structures, or slopes above the wall may lower the permit-free threshold. Drainage behind the wall is critical and must be addressed in design. Setback requirements apply to retaining walls near property lines.
Unpermitted walls: stop-work order, required engineering review, potential demolition. Fines $200 to $1,000.
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