Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 to 8 ...

Q. I want to build a retaining wall that’s going to look great for years. At my last house, I had a short retaining wall around a patio that started to lean out toward the lawn. The little wall was ...