Retaining wall replacement cost breakdown
By My Yard Editorial Team · 7/28/2026
The Quick Answer
Segmental block wall replacement averages $35–$70 per face foot, so a 40-foot wall at 4 feet tall is roughly $5,600–$11,200. Demolition of the failed wall adds $1,000–$3,000.
The Witty Breakdown
Walls fail for one reason: water pressure behind them. Anyone quoting you a rebuild without drainage stone and a drain pipe is selling you the same failure again.
Anything over 4 feet usually requires an engineered design and a permit, which adds cost but also adds the only paperwork that protects you.
Step-by-Step Fix
- 1
Excavate 12 inches of drainage stone behind the entire wall face.
- 2
Install a perforated drain pipe at the base with a daylight outlet.
- 3
Add geogrid every 2–3 courses for walls over 3 feet.
- 4
Compact backfill in 6-inch lifts, not one big dump.
Pro-Tip / Do Not Do This
Do not backfill with the clay you just dug out. That clay is why the old wall is now leaning at you.
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