Frost pushing on wet soil is what tips retaining walls here, so drainage and footing depth come first. The city's code exempts walls not over 4 feet that carry no extra load. Taller or loaded walls need a permit. We look at height, water and the lot line before we quote.
Frost is what knocks over retaining walls in this part of South Dakota. Wet clay behind a wall freezes, expands and pushes. Each winter moves the wall a little more, until it leans or cracks. So a wall that lasts here is mostly a drainage project: clean stone behind the wall, a drain pipe at the bottom with somewhere to empty, and soil at the top graded so water does not pour in behind it.
The footing matters too. A poured concrete wall needs a footing sized for its height and set deep enough for frost, with steel tying the wall to the footing. The Sioux Falls building code exempts retaining walls that are not over 4 feet, measured from the bottom of the grade to the top of the wall, unless they hold up extra load such as a driveway or a slope above. Taller or loaded walls need a permit and usually an engineer's design.
Sloped lots are common on the hills of east and south Sioux Falls and in walk-out basement neighborhoods. We build walls for level patios, driveway edges, window wells and garden terraces. At the estimate we look at the height, what sits above the wall, where the water will go and how close the property line is.
Retaining walls in Sioux Falls: common questions
Do I need a permit for a retaining wall in Sioux Falls?
Not for a wall that is not over 4 feet from the bottom of the grade to the top and carries no extra load. That is the exemption in the city's building code. Higher walls, or walls holding up a driveway, building or steep slope, need a permit.
Why is my retaining wall leaning?
Usually water and frost. Soil behind the wall gets wet, freezes and pushes. Blocked or missing drainage is the common cause. A small lean can sometimes be stopped by fixing the drainage. A wall that keeps moving needs rebuilding.
Can a wall go right on the property line?
Setbacks are a zoning question, and a wall's footing and drainage stone take room behind it. We check the city's zoning rule for your lot and suggest a survey if the line is not marked.
How it works
- Free estimate: Call, text or book online. We visit and measure.
- Written quote: Clear pricing with finish options.
- Prep & forms: We excavate, grade, compact the base and set forms and reinforcement.
- Pour, finish & cure: We pour, finish, cut control joints and tell you when you can use it.