Foundation Pier Estimator: How Many Piers for Foundation Repair?
If part of your foundation is settling, the fix usually involves piers driven or drilled to stable soil. Here is how contractors estimate how many.
What foundation piers do
Piers reach through weak surface soil to a stable layer below. Once in place they carry the weight of the foundation, halt further settling, and in many cases lift the structure back toward its original elevation.
Affected length and spacing drive the count
Estimators measure the length of the wall or slab edge that is settling and divide by typical spacing of 6 to 8 feet. Two piers is a common minimum, and a small corner repair often lands in the 3 to 6 pier range.
Perimeter vs interior
Perimeter piers handle most residential foundations. Homes on a slab with an interior settlement problem sometimes need interior support piers driven through the slab, which adds to the count and the cost.
Why this is an estimate
The true number depends on soil bearing capacity, the depth to stable soil, load from the structure above, and the specific pier system a contractor uses. A written scope after a site inspection is the only way to know for sure.
Signs a foundation needs repair
Watch for stair-step cracks in brick, diagonal cracks above windows and doors, doors and windows that stick, sloping floors, and separation between the foundation and the framing or brick veneer.
Frequently asked questions
How do I know if my foundation needs repair?
Common signs are stair-step cracks in brick, drywall cracks over doors and windows, doors that stick or gap, sloped floors, and gaps opening between the foundation and the framing above it.
How far apart are foundation piers spaced?
Six to eight feet is typical on the exterior perimeter, with the exact spacing set by a structural engineer or repair contractor based on soil, load, and the specific pier system.
Is the estimate accurate?
It is a planning range, not a final scope. Only a site inspection with elevation measurements can tell you where a foundation is actually settling and how many piers are truly required.
Try the calculator
Enter the affected length and get a planning range with our Foundation Pier Calculator.