Once you know what kicks you into nail-biting drive, you can try to find other ways to cope. Keep your hands or mouth busy. Find something to fiddle with -- a stress ball, a worry stone, or even a pen to click.
For simple interlocking blocks, the retaining wall cost would be approximately $15 to $30 per square foot. Therefore, for a 25-by-4-foot wall, the entire retaining wallâs cost would be anywhere from $1,500 to $3,000.
Shopping for a retaining wall: 1  Hiring an engineer to help design a retaining wall can run about $200-$500 or more, depending on the complexity and extent of the project. 2  Hiring an engineer is strongly recommended for walls over 3 feet high.hopping for a retaining wall: 1  Hiring an engineer to help design a retaining wall can run about $200-$500 or more, depending on the complexity and extent of the project. 2  Hiring an engineer is strongly recommended for walls over 3 feet high.