The Retaining Wall Cost Calculator estimates the total cost of a retaining wall by multiplying its face area by your material and labor prices per square foot, then adding extras such as drainage, excavation or permits.
Enter the wall length and height and the prices from your quotes or supplier. The calculator shows the estimated total, the wall face area and the cost per linear foot, so you can compare quotes that are priced in different ways.
Retaining Wall Cost Calculator
Estimate the cost of a retaining wall from its face area and your material and labour prices per square foot.
Formula
Total = L × H × (materials + labor) + extras
Cost per linear foot = Total ÷ L
Where:
- L = wall length; H = wall height (face height)
- Materials and labor = prices per square foot (or per m²) of wall face
- Extras = fixed costs such as drainage pipe, excavation, disposal or permits
How the Calculation Works
Step 1: Multiply length by height to get the wall face area.
Step 2: Multiply the face area by the combined material and labor price.
Step 3: Add the extras and divide by the length for a per-foot figure.
Variables Explained
| Input | Meaning |
|---|---|
| Wall length, height | Size of the visible wall face |
| Materials per face area | Blocks, stone, concrete, caps, base and drainage stone, per ft² or m² |
| Labor per face area | Installation price per ft² or m² |
| Extras | One-off costs |
The default prices are examples only — replace them with your local quotes.
Example Calculation
Given: wall 20 ft × 3 ft, materials $15/ft², labor $20/ft², extras $500 (example prices)
Face area: 20 × 3 = 60 ft²
Calculation: 60 × (15 + 20) + 500 = 2,100 + 500
Result: $2,600 total; $130 per linear foot
What Affects Retaining Wall Cost
- Material: segmental block, poured concrete, natural stone, timber and boulders are priced very differently.
- Height: taller walls need deeper footings, more drainage and often geogrid or engineering.
- Site access and soil: tight access, rock or poor soil raise labor and excavation costs.
- Drainage: drain pipe, filter fabric and clean stone behind the wall.
- Permits and design: some locations require permits or an engineer’s design above a certain height.
Material Estimation Notes
To price materials yourself, use the Retaining Wall Calculator (blocks and gravel), Concrete Retaining Wall Calculator or Boulder Retaining Wall Calculator to get quantities, then multiply by supplier prices.
Frequently Asked Questions
How do you estimate the cost of a retaining wall?
Multiply the face area (length × height) by the installed price per square foot and add any extras.
How do I compare quotes per square foot and per linear foot?
Enter the total quote as extras (with zero per-ft² prices) and read the cost per linear foot, or divide the total by the face area.
Does height affect cost more than length?
Often yes, because taller walls may need reinforcement, bigger footings and engineering.
What costs are often forgotten?
Excavation, hauling away soil, drainage materials, permits and repairing landscaping afterward.
Is a DIY retaining wall cheaper?
Setting labor to zero shows the material-only cost, but low walls are the usual DIY limit — taller walls may need professional design.