An engineered retaining wall is designed by a licensed Professional Engineer to resist specific earth and water pressures, requires PE-stamped drawings, a building permit, and inspection at multiple construction stages. A landscaping wall is typically decorative and low-height, built without engineering, inspections, or permits — relying on the contractor's judgment rather than structural design. On flat ground with no load, short landscaping walls often hold fine. On steep mountain terrain, near structures, or over 4 feet, they are the walls that fail.
