# Quick Answer: How To Design A Retaining Wall?

## How do you calculate retaining wall?

Multiply the length of the wall (in feet) by the height of wall (also in feet) to get the square footage of the outside face of the wall. Then, multiply 1.12. This allows for having 12% of the wall’s height under the surface of the ground to give the wall more stability.

## 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.

## Can I build a retaining wall myself?

While retaining walls taller than four feet should be engineered by professionals, you may be able to DIY a solution for a tall slope by creating two or more shorter “tiered” retaining walls as opposed to a single tall wall.

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## Do I need a structural engineer for a retaining wall?

You don’t really need a structural engineers report to build a 1m high retaining wall. It just needs to be built using rebar in hollow concrete blocks that ties through to the footings and filled with concrete.

## 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

## How much does it cost to put up a retaining wall?

The average cost of building a retaining wall is \$5,636. Most homeowners find themselves spending between \$3,229 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.

## 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 best base for a retaining wall?

Due to soil erosion, your retaining wall should be built on a solid foundation made from gravel.

• Choose gravel that has stones sized between 1/2-inch and 3/4-inch.
• Fill the trench with a 2- to 3-inch layer of gravel.
• Use a rake to ensure the stones are evenly distributed.
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## 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.

## 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.

## How high can you build a retaining wall without a permit?

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).

## Do I need a concrete footing for a retaining wall?

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.

## Who is liable for retaining wall?

Regardless of which side of the boundary the wall is, the owner receiving the benefit of the wall is responsible for maintaining it. In example 4 below, owner B would be responsible for the wall even if it had been built with boundary position 2 (on the neighbour’s property).

## What slope requires a retaining wall?

What is the slope? If the slope is greater than a 3:1, consult with an engineer. If the slope is over 2:1, it will require structures or special stabilization techniques.

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## How close can you build a retaining wall to a house?

Retaining walls and batter should be no closer than 1m from the house. With the exception of build to boundary lines. 1.2 -1.5m is a more desirable distance allowing better egress.