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Prices for landscape retaining walls range from $20 – $50 per square foot or $50 – $70 per hour. Some retaining wall companies are willing to offer labor only services and have the client provide all the materials. For DIY enthusiasts, this would save the most money by keeping overhead costs down.
After you’ve marked the area where the retaining wall will be installed, you’ll need to dig a trench that’s 4-6 inches deep. The trench should be deep enough to bury half of your first course of blocks. In other words, the trench should be twice as wide as a single block, most of which are 2-3 inches. Once you’ve removed the dirt, you need to tamp down the remaining soil.
You should fill your trench with a 2-3 inch layer of paver base. Use a metal rake to ensure the gravel is evenly distributed within the trench. Every inch of gravel you lay should be compacted before laying more. This can be done with a hand tamper. Having a solid base will serve as a firm foundation and will keep your retaining wall from slowly leaning over as the years go by.
Once you’ve dug your trench and laid your paver base, you’ll need to use a level to ensure the gravel is flat before you start laying your retaining wall blocks. This is the most challenging part of the process, but it’s critical to be certain that the first layer is completely level. If not, the courses on top will gradually get more and more uneven. In that case, you’ll need to remove the pavers and start over from the bottom.
All reinforced walls that are over 4 feet tall should have a toe drain installed. If it’s smaller than 4 feet, then you can get away without having drainage. For proper drainage, the first foot (12 inches) of space behind the wall should be filled with crushed stone. This will prevent water from puddling in soil and cause it to flow down to your drain hole.
An innovative way to repair a tilted retaining wall is to use helical anchors. The upside to this method is that you won’t need to tear down and restack the blocks. However, you’d need to hire a specialist and it’ll be expensive. The most common approach is to remove the blocks, regrade and relevel the base, and reinstall the blocks row by row. While doing this, be sure to use a level on each row to ensure it’s flat.
You should ask the retaining wall contractor for an estimate on the total cost for your retaining wall. Be ready to explain why you want a retaining wall and what your budget is for the project. Ask the retaining wall company how long they’ve been in business and how far out they are scheduled. Google their company name and read some reviews. Click here to get a free estimate on retaining walls from His Workmanship.
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