Retaining Walls in Adelaide
Retaining walls hold back sloping ground — common across the Adelaide Hills and foothills suburbs. Beyond appearance, they are an engineering job: drainage and structural design matter, and walls over a certain height need council approval. This page covers retaining wall types, costs, and the rules.
Materials and what affects cost
Common types are timber sleeper (treated pine or hardwood), concrete sleeper, besser/concrete block, and stone. Cost depends on height, length, material, and — critically — drainage and engineering. Taller walls cost disproportionately more because of the structural and drainage requirements.
Height, drainage, and approval
Retaining walls over a certain height (commonly around 1m, but check your council) require development approval and often engineering. Proper drainage behind the wall (aggregate and ag-pipe) is essential — most retaining wall failures come from water building up behind a wall with no drainage. Do not skip it.
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