Foundation Repair Cost Calculator

Foundation repair ranges from $500 to $3,000 for minor crack injection up to $8,000 to $25,000 for a helical pier system on a severely settling foundation. The national average for moderate repair — wall anchors or carbon-fiber straps — is $4,000 to $8,000. Full foundation replacement starts around $20,000 for a small home and can exceed $100,000 for a large home on a failing foundation. The wide range reflects the repair method, damage severity, your region, and access conditions. Pick your method, severity, and access in the calculator above for a localized estimate — and note that most policies don't cover foundation repair, so it's usually paid out of pocket.

Most foundation trouble traces back to soil and water. Expansive clay soils swell when wet and shrink when dry, and that repeated movement pushes and pulls on the foundation. Poor drainage saturates the soil around the house and lets hydrostatic pressure build against basement walls. Large tree roots draw moisture out of the soil, causing shrinkage and settlement, or physically press on the structure. Poorly compacted fill soil under the original construction settles unevenly. And in cold climates, frost heave — soil expanding as it freezes — cracks and lifts foundations. Because the cause dictates the cure, a lasting repair addresses why the foundation moved, not just the visible damage.

It depends on the problem. Leaking, non-structural cracks call for crack injection (epoxy or polyurethane) to stop water. A bowing basement wall up to about 2 inches is often held with carbon-fiber straps, which prevent further inward movement; steel wall anchors go a step further by reaching into the soil beyond the wall and can be tightened over time to gradually straighten it. A settling or sinking foundation needs push or helical piers driven down to load-bearing soil to lift and stabilize it. Sunken concrete slabs are raised with slab leveling (mudjacking or polyurethane foam). Chronic basement water is managed with an interior drainage system and sump pump. Full replacement is reserved for complete failure. The calculator prices each so you can compare.

Both stabilize a settling foundation by transferring the structure's weight down to strong, load-bearing soil, but they install differently. Push piers (resistance piers) are driven straight down hydraulically, using the weight of the house itself as resistance — so they work best on heavy structures that can provide that load. Helical piers are screwed into the ground like a giant bolt and don't need the structure's weight to install, which makes them suited to lighter structures, new construction, and tight-access spots; they're also used in tension as tiebacks to anchor bowing walls. Both run roughly $1,200 to $2,500 per pier installed, and most homes need 4 to 12 piers. A geotechnical or structural evaluation determines which is right and how many.

Usually not. Most policies exclude foundation damage from soil movement, settling, or gradual deterioration — they cover only sudden, accidental damage from named perils, like a slab flooded by a burst pipe. Earthquake damage needs a separate endorsement, and flooding needs a separate flood policy. A policy may cover resulting damage (like cracked drywall) if the movement was caused by a covered event such as a fallen tree, but the foundation repair itself is rarely covered. Because repairs commonly run $5,000 to $30,000+, they're typically paid out of pocket or financed with a home-equity loan. It's worth reading your policy and asking your agent before assuming coverage.

For any major repair — piering, wall stabilization, or drainage — an independent structural engineer's inspection ($500 to $800) is strongly recommended before you commit. Foundation companies often offer free inspections, but they have an incentive to recommend their own products, so an independent engineer can confirm the diagnosis, specify what's actually needed versus what's being upsold, and provide a stamped report that permits or a future sale may require. For a minor crack seal, an engineer's report usually isn't necessary. But for a five-figure repair, that independent verification is cheap insurance against paying for more than the foundation needs — the calculator includes a structural-engineer-report add-on.

Yes, but most states require you to disclose known foundation defects, and a buyer's inspector will flag obvious issues anyway. Foundation problems typically cut a home's value by 10–20% or more, and many buyers will either require the repair before closing or negotiate a price cut equal to — or larger than — the repair cost. You generally have three options: repair it before listing (often the best return, especially with a transferable warranty), sell as-is at a discount with full disclosure, or sell to a cash buyer or investor. A completed, warrantied repair with an engineer's sign-off reassures buyers far more than an unaddressed problem or a vague credit.

Both fill the voids under a sunken slab to raise it back to level, but they differ. Traditional mudjacking pumps a cement-and-sand slurry beneath the slab; it costs about $3 to $6 per square foot and is proven, but it's heavy — adding weight to already-unstable soil — and may need redoing in 5 to 10 years. Polyurethane foam injection costs about $5 to $25 per square foot but weighs far less, cures in minutes rather than days, is minimally invasive (dime-sized holes versus 2-inch holes), and usually lasts longer. For interior slabs and poor-soil sites, foam is generally preferred despite the higher price. The calculator prices slab leveling and factors in the affected area for larger jobs.

It scales with the method. Crack injection is usually a single day. Carbon-fiber straps or wall anchors take 1 to 3 days depending on how many are needed. A push or helical pier system (typically 4 to 8 piers) runs 2 to 4 days. An interior drainage system with a sump pump takes 2 to 5 days depending on the perimeter length. Full foundation replacement is a major project of 2 to 4 weeks that requires temporarily shoring up the structure while the old foundation is removed and the new one poured and cured. Access conditions and severity extend all of these — a finished basement adds demolition and restoration, and severe damage means more anchors or piers. Your contractor can give a firm schedule after evaluating the foundation.

Water control is 90% of prevention. Grade the soil to slope away from the foundation — about 6 inches of fall over the first 10 feet — keep gutters clean, and extend downspouts to discharge at least 6 feet from the house. Avoid over-watering landscaping right against the foundation, and fix plumbing leaks promptly. Keep large, thirsty trees 10 to 20 feet away, since their roots pull moisture from the soil or press on the structure. And in dry climates with expansive clay, keep soil moisture consistent during droughts (a foundation soaker hose helps) to avoid the extreme wet-dry swings that drive movement. Catching and correcting drainage early is far cheaper than any repair on this calculator.