We can do Structural Engineering designs of concrete retaining walls, Block retaining walls, and virtually any type of retaining wall that you want. If you need a retaining wall Structural Engineer design or even a retaining wall Structural Engineer inspection, then you might want to be familiar with city of San Antonio IB171, which describes in detail the permit requirements as well as retaining wall Structural Engineering requirements. A good summary of the retaining wall publication by the city is that any wall 4ft or higher requires a structural engineer to design the foundation and wall of the retaining wall.