Retaining walls come in a variety of shapes and sizes, made of concrete, wood, block, and with steel beams for posts. They function to hold back soil and are often used as foundation walls. Many older walls fail due to inadequate footings, lack of drainage behind the walls, or poor soil conditions. We construct walls using L-shaped footings on most level surfaces, but sometimes drilled concrete piers or steel I beams set in concrete are needed to support the new walls when they are on a slope or if soil conditions are poor. By excavating soil in basements or in yards and building new retaining walls we can create living spaces, patios, garages, etc.