Have a steep yard or sloped space that’s hard to use? Retaining wall stairs are the perfect solution. They make uneven terrain safe to walk on while holding back soil and improving drainage. If you’re wondering how to build retaining wall stairs that are both strong and attractive—this guide will walk you through each step.
Why Build Retaining Wall Stairs?
These stairs serve two important purposes:
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They stabilize the slope by holding soil in place
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They create a walkable path through different levels of your yard
Whether you’re upgrading a sloped garden or creating access to a raised patio, retaining wall stairs offer structure, safety, and curb appeal.
Step-by-Step: How to Build Retaining Wall Stairs
1. Plan Your Design
Start by measuring the rise (total height) and run (horizontal length) of the slope. Divide the rise by your ideal step height—usually between 6 and 8 inches—to figure out how many steps you need.
Each step should be 12–18 inches deep. Keep dimensions consistent for safety and comfort.
Tip: If your wall is over 4 feet tall, or supports extra weight (like a driveway), check your city’s building code—you may need a permit.
2. Mark and Clear the Area
Use stakes and string to mark the stair layout. Dig out vegetation, soil, and debris along the path. You’ll need to dig down about 6–12 inches to make room for a gravel base. Compact the soil underneath to prevent settling.
3. Build a Solid Base
Lay 4–6 inches of crushed gravel along the trench and compact it tightly. This forms the foundation for the first row of wall blocks. A level base is key—take your time to get it right.
4. Lay the First Row of Blocks
Place your first course of retaining wall blocks directly on the base. Use a level to make sure they’re even. Tap each one into place with a rubber mallet.
This bottom row sets the tone for everything above it, so precision is essential.
5. Stack Wall Blocks and Build Steps
Continue stacking blocks up the slope, setting each new row slightly back (this is called the setback). Use adhesive between layers for added strength.
At each step, install side blocks perpendicular to the main wall to frame the treads. These hold the fill material and define each stair level.
6. Fill the Treads
Fill the area behind each riser with crushed gravel and compact it. Then add a leveling layer of paver base or sand. Finish the tread with pavers, stone, or concrete blocks. Make sure each step slopes slightly forward to allow water to drain.
7. Finish with Caps and Backfill
Glue capstones to the top of the wall for a polished look. Backfill around the stairs and grade the soil to direct water away from the structure.
If your stairs are part of a tall wall, install a perforated drainage pipe and backfill with gravel to prevent water pressure from building up behind the wall.
Common Mistakes to Avoid
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Skipping base prep (causes sinking)
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Uneven step heights (creates tripping hazards)
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No drainage (leads to wall failure)
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Weak reinforcement (especially for tall walls)
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Poor block alignment (affects safety and appearance)
Pro Tips for Long-Lasting Results
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Inspect the stairs every spring for movement or cracks
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Keep drainage areas clear of debris
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Re-glue any loose capstones as needed
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Avoid planting deep-rooted trees or shrubs near the wall
Not Sure Where to Start? We Can Help
Building stairs into a retaining wall isn’t easy. If you’re working with a steep slope, poor soil, or just want the job done right, Mile High Lifescape is here to help.
We’ve built retaining wall stairs all over Denver for over 20 years. From permits to drainage to installation—we handle it all. Get in touch today for a free consultation and see how we can turn your sloped yard into something beautiful and functional.
🌏 Contact Us
Mile High Lifescape
Address: 1007 S Federal Blvd, Denver, CO 80219, US
Phone: 1-303-877-9091
Website: https://milehighlifescape.com/
Email: hello@milehighlifescape.com
Google Maps: https://www.google.com/maps?cid=8131554802714482277
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