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🧱 Retaining Wall Cost Calculator

Estimate the cost to build a retaining wall. Covers interlocking block, timber, and boulder styles with drainage and backfill.

Project Details

Wall Length (ft)

Total length of the retaining wall

Wall Height (ft)

Height of the finished wall above grade (max 4 ft for DIY)

Wall Type

Your Estimate

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Adjust the fields to see your estimate.

Cost Breakdown

Recommended Tools & Supplies

Compact gravel base for a level, stable wall footing

Keep each course of block or timber perfectly level

Score and split blocks for corners and end cuts

Set blocks without cracking; adjust position without damage

Excavate the footing trench and backfill gravel

Pro Tips

✓ Bury the first course 6 inches below grade — the foundation row is invisible but critical
✓ Install drainage pipe and gravel behind every retaining wall or hydrostatic pressure will push it over
✓ Step back each course 1 inch per foot of height (batter) for long-term stability
✓ Walls over 4 ft require a permit and engineering in most jurisdictions — check before you dig

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