Foundation Pier Estimator

How to estimate foundation piers

Foundation piers are the standard fix when part of a home's foundation starts to settle. This calculator gives you a rough planning range for how many piers a repair might require, based on the length of the affected foundation. It is meant as a sanity check before you call a contractor, not as a substitute for a real evaluation.

What foundation piers do

A pier is a steel or concrete support pushed or drilled down to stable soil (or bedrock) beneath the home, then attached to the foundation. Once installed, piers can stop further settlement and, in many cases, lift the foundation back toward its original level. Different systems (helical piers, push piers, drilled shafts) work differently, but the counting logic is similar.

Affected length drives the count

Pier count is driven by how much of the foundation is affected, not by the total perimeter of the house. If only one 20 foot section is showing signs of settlement, piers are placed along that section, not around the whole home. Spacing is typically 6 to 8 feet along the affected run, which is why this calculator returns a range.

Perimeter vs interior work

Most foundation repairs happen along the perimeter, since that is where the exterior walls sit on the foundation. Sometimes interior load-bearing walls or slab sections also need support, which adds piers. This calculator lets you flip a switch to bump the estimate up by roughly 20 to 30 percent to account for interior work.

Why it is only an estimate

Real pier count depends on many variables this calculator cannot see: soil composition, water table, home weight, exact settlement pattern, and the specific pier system being used. Two neighboring houses with similar cracks can end up with very different pier plans after a proper evaluation.

Signs your foundation may need attention

Common warning signs include diagonal cracks in drywall above doors and windows, doors and windows that stick or no longer latch, gaps between baseboards and the floor, sloping or bouncy floors, and stair-step cracks in exterior brick or block. Any of these are worth an evaluation from a reputable foundation contractor.

These are planning estimates. A structural engineer or licensed foundation contractor determines the final pier count and layout after a site evaluation.