The answer to the cost of retaining wall installation is that it can vary widely depending on several factors. Typical ranges for a basic retaining wall installation can be anywhere from $15 to $50 per square foot, but the actual cost will depend on the size and complexity of the project, the materials used, the terrain, and your location.
Some key factors that influence the cost include the height and length of the wall, the type of materials (concrete, stone, brick, etc.), the soil conditions, and whether any excavation or site preparation is required. Walls with curves, corners, or tiers will also typically cost more. Additionally, labor rates can vary significantly by region.