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How to build a retaining wall
Plan and layout the site.
Plan where your retaining wall is going to be using stakes and string, leveling off to ensure an even height and using a tape measure to ensure an even length.
Contact your local utilities office to confirm that there are no pipes or cables in your digging zone.
Your local utilities office should perform this free of charge. If you live in the usa, you must make an 811 " digline " call and set up a time to have your property inspected to determine the location of underground utility pipes and cables before starting any digging project.