Cost For Retaining Wall

How Much Does a Retaining Wall Cost?

The national average cost for a retaining wall is around $25 – $50 per square foot. Here’s how to calculate the cost for your retaining wall project. In the US, the total average cost will run approximately $5,800.

Retaining Wall Solutions 

Cost

Full Concrete Demolition $5 per square foot
Leveling & Grading $1.31 per square foot
Heavy Equipment $175
Materials (see below for breakdown)              . $5-$32 / sq. ft.
Labor Fees $55 per hour
Designs and  Architectural Service $80 per hour
Water Drainage System $67 per linear foot

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Building a retaining wall on a sloping property can have several benefits for property owners, as follows:

  • Preventing landslides
  • Stabilizing hillside properties
  • Yard expansion
  • Keeping water at bay on lakefront properties

Due to these benefits, a retaining wall can add value and aesthetic appeal to your home as well as increase the enjoyment you get out of your yard.

Retaining Wall Length x Depth

 Estimated Cost

10 x 3-feet (30 sq.ft.) $1,650
20 x 3-feet (45 sq.ft.) $2,900
25 x 3-feet (75 sq.ft.) $3,800
30 x 4-feet (100 sq.ft.) $6,224
50 x 4-feet (160 sq.ft.) $9,000
60 x 4-feet (240 sq.ft.) $12,000+

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According to the NAR’s latest Remodeling Impact Report for outdoor features, hardscaping upgrades like retaining walls, are among the top four features that add appeal and value to a home.

If you’re considering installing a retaining wall, your first question is likely, ‘How much does a retaining wall cost?’

What Is a Retaining Wall?

A retaining wall is any structure that holds soil in place behind it.

retaining wall cost

As such, they’re instrumental in preventing a landslide from destroying property and endangering lives.

They’re used for a wide range of applications both large and small. These include:

  • Enormous soil-retaining projects alongside highways
  • To help control erosion from hard rains
  • Create an attractive terraced yard
  • To create focal points in a garden
  • To level a slope
  • Creating attractive outdoor entertainment areas

When planning a retaining wall, its important to consider the use of the structure during the planning phase. This will affect every aspect of your build.

Other things to bear in mind are:

Location 

Know your limits when building a retaining wall.  You should check on aspects like irrigation, local regulations, your property boundaries, and stormwater management protocols.

You should also consider the slope of your environment and what to do with any excess soil you remove.

Retaining Walls

Be cognizant of natural drainage patterns that could have an environmental impact downstream.

It’s also important to build a wall that’s strong enough to endure any extra load you’ll place on it, like fencing or a paved driveway.

Soil Type 

Is the soil at the base of your wall strong enough to support it?

The base of your wall should be firm and solid, without excess moisture. Clay soils are already saturated with water, and unable to support the weight of a retaining wall.

Sandy soils are best for drainage.

A geotechnical report will reveal the presence of problem soils, groundwater conditions, and the chemical properties of your soil.

Design

The final aesthetic appeal’s an important part of the design process but you should also consider the following:

  • Setback angle
  • Footprint size
  • Gravity

Gravity will cause the retained soil to move downslope, so it’s important to counteract these effects in your design. This force increases according to how steep your hill is.

Excessive gravitational forces can cause your wall to collapse.

All these aspects will affect the type of wall you choose to build as well as the materials you use.

Types of Retaining Walls

Fortunately, there are retaining wall systems available to suit almost all of the above conditions. So, once you’ve got a clear idea about the properties of your landscape, you can decide on the type of retaining wall that best suits your needs.

Building Retaining Wall

There are three main types of retaining walls to choose from:

Gravity Walls

Gravity retaining walls depend on their weight and setback to retain the soil. They’re usually short walls under 4-feet high, so they’re cheaper to build.

Gravity walls are self-supporting up to 10-feet, although you’ll need a permit to build one higher than 4-feet.

Gravity walls can have a straight or curved shape. They’re made from heavy materials like concrete blocks, cast-in-place concrete, or stone.

Block retaining walls work well in these settings as they automatically form a setback that helps support the pressure of the soil behind the wall.

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Segmental Retaining Walls

Segmental retaining walls are a type of reinforced gravity wall that works well for both residential and commercial sites. They’re especially good for high-sloped terrain and usually have no height restrictions.

You can design them according to any shape as they’re made from interlocking modular blocks.

Reinforced Retaining Walls

Reinforced retaining walls use some type of reinforcement to add strength to the retaining wall structure and better retain the soils behind it.

Usually, contractors place Geogrid made of polymers in between courses of blocks and roll it back into the slope to help retain the soil. This makes the soil mass stronger and more stable.

This mesh works with the blocks to create a stronger, heavier wall structure. In cases where geogrid won’t work, no-fines concrete, soil nails, or earth anchors will suffice.

The latter types of reinforcement are usually designed by an engineer.

Cantilevered Walls

Cantilevered retaining walls rely on leverage to work and are best suited for tall walls up to 18-feet with deep excavations.

They usually have an inverted T-shape made from mortared masonry or reinforced concrete. The wall has a base slab made from rigid concrete and divided into two parts –

  • The heel which goes under the backfill
  • The toe which makes up the other part

A relatively thin stem is then fixed in place on top of that. Often, concrete contractors can pour a cantilevered wall onsite.

Counterfort Walls

These are a type of cantilevered wall that has additional supports in the form of concrete webs placed at an angle along the back of the wall. These webs, called counterforts, help reduce soil pressure along the wall while increasing its weight and strength.

Landscape Retaining Wall

These types of walls are best for very tall structures over 25-feet.

Panel Walls

Panel walls are the type of retaining walls used in highway ramps. These walls use steel posts to connect a series of precast steel-reinforced panels to contain the soil.

Most panel walls are custom designed and used for very large projects.

Gabion Mesh Walls

Gabion mess walls are most often used along streams to prevent erosion. They consist of rectangular wire mesh baskets filled with rocks.

The next step is to stack the ‘bricks’, angle them back against the slope, and tie them together. Gabion mesh walls only last as long as it takes for the metal basket to corrode.

Types of Materials Used for Retaining Walls and The Cost

You can get most types of retaining walls in colors or textures to suit your design. Yet, the most important part of retaining wall construction is the materials they’re made from.

Treated timber is a simple and inexpensive choice for retaining walls but it has a noticeably short lifespan.

Retaining Wall Material Type 

Estimated Cost Per Square Foot

Cinder Blocks $13 per sq. ft.
Poured Concrete $23 per sq. ft.
Wood Timber $20 per sq. ft.
Stone Veneer $13 per sq. ft.
Boulder/Rock $11 per sq. ft.
Gabion $6-$35 per sq. ft.
Brick $14 per sq. ft.
Corten Steel/Metal $4 per sq. ft.
Earth/Chalk $5-$20 per sq. ft.

Stones, boulders, and rocks are a durable and attractive choice, but it’s expensive and time-consuming to install them. They’re also a haven for rodents and weeds and need ongoing maintenance to look their best.

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Brick retaining walls offer excellent strength and durability but they’re also expensive and labor-intensive.

Cast-in-place and mortared retaining walls are an excellent choice for most retaining walls. They’re strong and durable, as well as capable of withstanding most climates and weather events.

They’re flexible concerning textures, veneers, and colors too.

How Much Does a Retaining Wall Cost per Square Foot?

Contractors price most retaining walls by the square foot for materials and labor. All the factors mentioned above will determine the retaining walls cost per square foot.

If you want to build a retaining wall that’s higher than 4-feet, you need a structural engineer to assist with the job. This will increase your costs considerably.

That’s why it’s important to get as many quotes as you can before you hire a contractor to start work on your retaining wall and landscaping. You don’t want to get halfway through the job and have to put everything on hold because you can’t afford to carry on.

The national average cost for a retaining wall is around $25 – $50 per square foot. Here’s the typical cost by the type of retaining wall you need:

Type of Retaining Wall Installed

Estimated Cost Per Square Foot

Sheet piling $15 per square foot
Gravity $19 per square foot
Anchored $23 per square foot
Hybrid $21 per square foot
Cantilevered $22 per square foot
Counterfort $20 per square foot
Reinforced $21-$27 per square foot
Rammed earth $19-$25 per square foot
Criblock $26-$33 per square foot

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It’s difficult to know what size retaining wall you’ll need offhand, but you can calculate the approximate size using the formula below:

  • Using a tape measure, measure the length in feet of the area where you want to place your wall
  • Measure the desired height of the wall
  • Add .5 to the measurement to compensate for the footers that sit underground
  • Multiply these two measurements together to determine the total square footage of the wall
  • If you want to know how many square inches you’re working with, multiply this figure by 144

It’s always best to round your calculations up when you’re looking for retaining wall prices online. This ensures you don’t underestimate the cost of a retaining wall.

How Much Does a Lake Retaining Wall Cost?

If you live near a lake or other body of water, your home could be at risk from flooding in times of heavy rain.

All water bodies rise during these times and a lake retaining wall could protect your home and garden from serious damage.

Rocks and stones can serve as an effective barrier against high-water levels. You can also build a retaining wall from any material that suits the design of your home.

It’s important to consider environmental issues, like beach access for aquatic species. In areas where turtles occur, choose a material like stones so these creatures can still climb up onto the shore when needed.

Usually, a lake retaining wall’s set back from the water’s edge at an acceptable distance from your home. In these cases, you can calculate the cost per square foot as above.

If you decide to build a retaining wall in the water, your costs will escalate considerably. You’ll need to negotiate a bevy of expert environmental consultations as well as pay for excavation costs to install the wall.

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How Long Will a Retaining Wall Last?

A well-built retaining wall can last between 50 and 100 years. However, some things can affect how long it lasts. The longevity of your wall depends on two major factors:

Materials

The more durable materials like concrete and stone will last longer. A brick wall has the longest lifespan of all. Choosing a knowledgeable contractor’s the best way to ensure your wall lasts as long as possible.

Climate

Consistent severe storms will wear your wall out faster. Likewise, temperatures that fluctuate between extremes can cause cracks in concrete over time. It’s important to inspect your wall regularly for maintenance issues.

Considering the high cost of retaining walls, you want them to last as long as possible. One of the best ways to ensure your wall lasts a long time is to get an experienced contractor’s advice on how to make it last longer.

There are a few things you can do to get the maximum lifespan out of your retaining wall, too. These are:

  • Check your retaining wall regularly
  • Repair any cracks and signs of damage promptly
  • Remove debris from drainage pipes
  • Replant any dead spots

If your wall starts to bulge, you could be in for serious problems. Get professional help right away.

How Much Does It Cost to Repair a Retaining Wall?

Act swiftly when your retaining wall needs repairs.

Most retaining walls will need some sort of repair over their lifetime. This could be due to poor initial construction, age, or severe water saturation.

According to estimates, you could spend between $200 and $800 on each repair.

If you build a wall out of interlocking stones, you can reduce the number of repairs your wall’s likely to need overall. These pieces fit together like building blocks and your contractor will hammer them down to ensure a snug fit.

Since there are fewer elements involved in this type of construction, fewer things can go wrong.

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Take the Next Step Toward Building a Retaining Wall

The cost of a retaining wall and other home repairs can vary considerably according to your location.

For example, Hawaii has the highest construction-related labor costs in the USA. Oklahoma’s known for its cheap labor and building costs.

So, how much does a retaining wall cost in your area? The easiest and best way to find out is by getting up to 5 quotes and comparing them right here on our website.

Click below to get your quotes or keep reading our blog for more information on how to keep your home in good repair as well as increase its value and appeal.

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