Retaining walls
Why your retaining wall is bowing, and how to tell if it will fail.
A leaning wall is a symptom. The actual problem is usually water, base, or geogrid. Here is how to figure out which one is haunting yours.
April 22, 2026 / 6 min read
A retaining wall is a vertical line that water and soil are constantly pushing on. When that line bends, it is telling you that whatever was supposed to hold it back has stopped working. The good news is, walls almost always tell you something is wrong before they fail. The bad news is, most homeowners read that signal as cosmetic and wait too long to act.
There are three usual suspects behind a bowing wall: water trapped behind it, a base that was never compacted enough to hold the load, or geogrid reinforcement that is missing or too short. Most of the time it is some combination of all three.
Water is the number-one offender.
Soil saturated with water can double in weight. If a wall was designed for dry conditions and no real drainage was installed behind it, the first heavy rain season is when the math stops working.
Look at the joints. Are they opening up? Look at the top course. Is it stair-stepping forward at any point? Stand back and sight down the wall. Any wave or belly that was not there last year is the wall telling you it cannot hold what is behind it anymore.
Check the base.
A wall is only as good as the compacted aggregate underneath it. If the base was thin, or the soil under the base was not compacted, the wall can settle unevenly. You will see one section dropping below the rest, or vertical joints widening at the bottom.
Settlement at the base is harder to fix than drainage. Sometimes the right call is to rebuild that section from scratch.
Geogrid (or its absence) explains the rest.
Once a wall hits about three or four feet, gravity alone is no longer enough to hold the hill. Geogrid layers tie the wall to the soil mass behind it. Walls built without geogrid where it was needed tend to bow at the middle, because the top is being pushed forward while the base stays put.
When to call.
If your wall is leaning more than an inch off plumb, if joints are opening, or if you can see ground sinking behind it, get an evaluation. The cost of pulling a wall apart and rebuilding it correctly only goes up the longer you wait. Worst case, it fails during a storm and takes part of the yard with it.
Most walls do not need to be entirely replaced. Often we can rebuild a single tier, add proper drainage, and tie everything back together with geogrid. We will tell you what your wall actually needs before we tell you what it would cost.
