Often asked: How To Build A Garden Retaining Wall On A Slope?

Can you build a retaining wall on a slope?

When retaining walls are built, they slope slightly to one side in order to improve drainage. If the location where you‘re building the wall has an uneven slope, you‘ll need to smooth out the slope before you build the wall. Tamp the soil to compact it and provide a firmer base for the retaining wall.

How do you build a retaining wall with uneven ground?

How to Build a Retaining Wall on Uneven Ground

  1. Step 1: Install Stakes and Attach String.
  2. Step 2: Level the String.
  3. Step 3: Dig Retaining Wall Trench.
  4. Step 4: Tamp Soil and Add Gravel.
  5. Step 5: Add Sand and Wall Blocks.
  6. Step 6: Add Second Row of Blocks.
  7. Step 7: Pour Gravel and Spread Fabric.

How much does it cost to build a retaining wall on a slope?

The national average cost for a retaining wall is around $25 – $50 per square foot.



How Much Does a Retaining Wall Cost per Square Foot?

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Type of Retaining Wall Installed Estimated Cost Per Square Foot
Anchored $23 per square foot
Hybrid $21 per square foot
Cantilevered $22 per square foot
Counterfort $20 per square foot

What is the easiest retaining wall to build?

For the average do-it-yourselfer, building a retaining wall is easiest when using masonry blocks that will be stacked no taller than three feet, with no mortar binding the stones or concrete members. (For a curved wall, mark instead with a garden hose or spray paint.)

What is the cheapest type of retaining wall?

What is the cheapest retaining wall material?

  • Treated pine and is the least expensive material.
  • Hardwood is more expensive than treated pine.
  • Railway sleepers are another – slightly more expensive – option and are built to withstand ground and water contact.
  • Concrete sleepers are more expensive.

Does a retaining wall need a footing?

No, you do not need a concrete footing, it will actually adhere the wall from being able to naturally shift. It is best to use a coarse stone aggregate for the Retaining Wall footing.

Does a 2 foot retaining wall need drainage?

Although there are exceptions, most retaining walls require gravel backfill, soil compaction, pipe or toe drains, and weep holes. Together, these four features will provide adequate drainage for most designs. Only a few types of walls will not require all of them.

At what height does a retaining wall need to be engineered?

Most municipalities require a building permit and a design from a Licensed Engineer if your wall is taller than 4 feet high (measured from the bottom of the first block to the top of the last block). Will your retaining wall be terraced?

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How high can you build a retaining wall without council approval?

For example, in New South Wales, you can only build your retaining wall up to 600mm from ground level without council approval while on the Gold Coast of Queensland, you need building approval for retaining walls 1 metre or more in height.

How deep should the footing be for a retaining wall?

Concrete retaining wall footing size



The depth to the bottom of the base slab should be kept at a minimum of two feet. However, it should always be below the seasonal frost line, and that often is much deeper in northern climates.

How do you build a retaining wall on a sleeper slope?

Constructing a retaining wall out of upright sleepers is pretty straightforward. Simply dig a trench, lower the sleepers in vertically side by side, and then backfill with a dry concrete mix, that you can ram down around the railway sleepers untill the wall is rigid.

How much does a 6 foot retaining wall cost?

The average cost of building a retaining wall is $5,585. Most homeowners find themselves spending between $3,190 and $8,670. The cost of retaining wall materials ranges from $3 to $40 per square foot. Wall block prices fall between $10 and $15 per square foot, while precase, poured concrete runs $20 to $25.

How much does a 4 foot retaining wall cost?

Retaining Wall Cost per Square Foot

Size Average cost
25 x 3-feet (75 sq.ft.) $3,750
25 x 4feet (100 sq.ft.) $5,000
40 x 4feet (160 sq.ft.) $8,000
60 x 4feet (240 sq.ft.) $12,000
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Can I build my own retaining wall?

Retaining walls can be made from wood, bricks, natural stones or concrete blocks. For DIYers, it’s best to use concrete retaining wall blocks, which can be interlocking and are heavy enough to stay in place without cement or other adhesive. Interlocking blocks fit together and add extra security to the wall.

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