Retaining wall cost depends on height and the load it needs to hold back — taller walls often require engineering, not just materials and labor.
What to look for
- Drainage behind the wall — this is the single most common point of failure if skipped, since water buildup is what pushes walls over.
- Engineering review, required in many areas above a certain wall height.
- Material and reinforcement named specifically — segmental block, poured concrete, or timber all behave differently over time.
- Permit, which taller walls typically require.