What equipment do I need to build a retaining wall?

For most retaining walls you need a mini excavator for digging the trench and moving materials, a plate compactor for base compaction, a level, string line, and basic hand tools. For walls over 4 feet, you may also need rebar and concrete equipment.

How deep should a retaining wall footing be?

The base trench should be at least 6 inches deep plus 1 inch for every 8 inches of wall height. In Southern Utah, footings should extend below the frost line (approximately 12-18 inches). The trench should be twice the width of the block being used.

Do I need a permit for a retaining wall in St. George?

In St. George, Utah, retaining walls over 4 feet tall (measured from the bottom of the footing to the top of the wall) typically require a building permit and engineered plans. Walls under 4 feet on your own property usually do not require a permit.

Can I build a retaining wall myself?

Yes, walls under 4 feet are a manageable DIY project with the right equipment. Rent a mini excavator for digging and a plate compactor for base preparation. Walls over 4 feet should involve an engineer and may require a contractor.

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DIY

How to Build a Retaining Wall in Southern Utah

Step-by-step guide with equipment recommendations for residential retaining walls.

12 min read

January 28, 2026

Complete guide to DIY retaining wall construction.

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How to Build a Retaining Wall in Southern Utah

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