Most retaining walls hold back soil either in planting beds or on a hillside. Retaining walls over two feet in Arlington County, Fairfax County, Alexandria, and Loudoun County, Virginia require a building permit. A license contractor must pull the building permit for retaining walls. Retaining walls over four feet also require that a Virginia licensed engineer design the drawing and place their seal on it.
The counties must inspect retaining walls and final them. Phoenix works with cinder block, brick, stone, and wood as materials for retaining walls.
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