Calculator
Retaining Wall Cost Calculator
Price a retaining wall by face area, material and drainage requirements.
Verified August 2026
Select a state to re-price the estimate with local labor and material costs.
Usually required once the wall exceeds 4 ft of exposed height.
Estimated total cost
$5,914 – $8,400
- Wall face area
- 160 sq ft
- Cost per square foot of face
- $42
- Cost per linear foot
- $168
- Base and drainage
- $1,600
Estimates only. Local pricing, site conditions and code requirements change the real number.
The formula
Face area = length x height; Cost = face area x material rate + base + drainage + engineering
Most jurisdictions require an engineered design and a permit once a wall exceeds four feet in exposed height, which materially changes the cost.
Worked example
A 40 ft long, 4 ft high segmental block wall runs about $6,400 to $9,100 with drainage.
Frequently asked questions
How much does a retaining wall cost per foot?
Block retaining walls generally run $35 to $60 per square foot of exposed face in 2026, including base and drainage.
Do retaining walls need a permit?
Most jurisdictions require a permit and an engineered design above four feet of exposed height, and sometimes lower when the wall carries a surcharge such as a driveway.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.