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Top-Rated Retaining wall installation pros in Washington - Updated Nov 2026

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Retaining Wall Installers FAQs, answered by experts

DIY is possible for small projects. Professional installation ensures structural integrity and durability for larger walls.

If you don’t backfill a retaining wall—either at all or adequately enough—the wall won’t drain well, and water will be able to pass through it. Poor drainage will lead to a warped wall or a buildup of hydrostatic pressure, which can eventually collapse your retaining wall. If you have particularly sloped land, consult a structural engineer to ensure your hardscaping is adding value to your home.

Generally speaking, a retaining wall should be between 3 and 4 feet high, depending on variables such as the wall-building material, the purpose of the retaining wall, and more. If you want your retaining wall to be taller than 4 feet, check with your local building ordinance office for the maximum allotment. You may also need a special permit for retaining walls over 4 feet tall.

Sand and gravel are two suitable options for filling behind a retaining wall. If you’re building your own retaining wall, you’ll complete this part of the process—known as backfilling—after you finish laying the blocks. Make sure not to skip it—otherwise, you could wind up with drainage issues, which can cause your retaining wall to collapse.

Costs range from $5,000 to $15,000, depending on size, material, and design complexity.

The Washington, IL homeowners’ guide to retaining wall installation services

From average costs to expert advice, get all the answers you need to get your job done.