A retaining wall does real structural work — holding back soil, managing grade, and controlling drainage — so the price reflects the engineering, not just the look. In Southeast Michigan, expect an average of $45 to $60+ per square foot, with a typical project minimum around $2,500.
Material type
Material is the biggest cost lever. Manufactured block is typically a higher-cost option than natural boulders, which often install faster with equipment instead of labor-intensive hand-setting.
Size of the wall
Height and length drive both material volume and the engineering required — taller walls need more base, reinforcement, and drainage behind them.
Worksite
Access matters. A site equipment can reach easily costs less to build than a tight backyard where everything moves by hand.