How to Build a Simple Dry-Stack Stone Retaining Wall

Gravity is the primary opponent when building a retaining wall. If you simply stack rocks against a slope, the weight of saturated soil behind the wall will push them over within a season. A successful wall manages that pressure by leaning slightly into the hill and providing an exit route for groundwater. Building with stone—specifically the dry-stack method—is more about patience than strength. You are looking for stable contact points between rocks rather than a perfect fit. When done well, the wall looks like it grew out of the landscape, standing as a firm barrier that keeps your garden beds where they belong without looking like a concrete fortress.

1. Compact the Foundation First. Dig a trench along the base of your slope that is twice the width of your base stones and about six inches deep. Ensure the floor of the trench is level and firmly compacted using a hand tamper.
2. Anchor Base Stones Below Grade. Place your largest, flattest stones in the trench. Bury at least half of the height of these base stones below grade to lock them into the earth.
3. Build Your Water Escape Route. Pour a layer of clean, crushed gravel directly behind the first course of stone. This creates a chimney for water to travel downward instead of pushing against your wall.
4. Lean Into the Slope Deliberately. Lay subsequent courses of stone, ensuring that each stone rests on two stones below it. Recede each layer backward into the slope by about half an inch to create a 'batter,' or inward lean, which provides structural stability.
5. Keep Dirt Out of Drainage. Place a strip of landscape fabric against the backside of the wall before adding more soil. This keeps fine dirt from washing into your gravel and clogging your drainage system.
6. Crown It with Heavy Caps. Select your flattest, most uniform stones for the top layer. Arrange them to create a solid, finished appearance that ties the structure together.