Retaining Wall Cost Calculator
Estimate installed retaining wall cost from the wall's face area and your material and labor rates per square foot. Splits material, labor, and total.
How this calculator works
Installed retaining-wall cost is a blended material rate (block, base, drainage gravel) plus labor, per square foot of wall face.
Formula: Total = wall face area × material rate + wall face area × labor rate, where face area = length × height.
Worked example
A 20 ft long × 3 ft tall wall (60 sq ft face), $15/sq ft material, $20/sq ft labor:
- Face area: 20 × 3 = 60 sq ft
- Material: 60 × $15 = $900
- Labor: 60 × $20 = $1,200
- Total installed: $2,100
Cost reference (at $35/sq ft face)
| Wall (length × height) | Face area | Installed cost |
|---|---|---|
| 20 × 2 | 40 sq ft | ~$1,400 |
| 20 × 3 | 60 sq ft | ~$2,100 |
| 40 × 4 | 160 sq ft | ~$5,600 |
How to use
Measure the wall’s length and finished height and enter local rates. For the block and base quantities, use the Retaining Wall Block and Paver Base calculators. Budget engineering and permits separately for taller walls.
Retaining walls over a few feet are structural and often code-regulated. Confirm design and permitting with a professional.
Frequently asked questions
How much does a retaining wall cost?
Segmental block retaining walls typically run $20–50 per square foot of wall face installed, covering block, base, backfill gravel, drainage, and labor. The calculator defaults to $15 material and $20 labor per square foot of face; enter your local rates.
Is wall cost by face area or footprint?
By face area — the wall length times its exposed height. Enter length and height here. A 20-foot wall 3 feet tall has 60 square feet of face regardless of how thick the block is.
What drives retaining wall cost up?
Height is the big one: walls over about 3–4 feet often need engineering, geogrid reinforcement, and deeper base, sharply raising cost per square foot. Poor drainage, hard digging, and tiered designs also add.
Do I need a permit or engineer?
Many jurisdictions require a permit and an engineer's design for walls over 3–4 feet, because a failed retaining wall is dangerous. Always check local rules — engineering and permits are extra costs not in this estimate.
Estimates only. Verify quantities with your supplier before purchasing.