Should you repair or replace your foundation?
Updated August 2026
← Every repair-or-replace call
Foundations get repaired, essentially never replaced: crack injection is $500–1,500, piering runs $1,000–3,000 per pier, and full stabilization lands at $10,000–40,000, while a true lift and re-pour starts near $20,000 and can pass $100,000. That last option is rare enough that most owners will never be quoted one. The real decision is which repair method fits the movement you have, and whether that movement has stopped. Spend $400–800 on an independent structural engineer before you accept any five-figure proposal.
The short version
Replacement is off the table for almost every house, because a foundation is not a component you swap out; it is what the building stands on. The honest question is which repair, and whether one is needed at all. Hairline vertical cracks in a poured wall are shrinkage from the original cure and typically need nothing beyond sealing to keep water out. Stair-step cracks in block, cracks wider than about 1/4 inch, doors that stop latching, and floors out of level point to settlement, and those get piers driven to load-bearing soil at $1,000–3,000 apiece. A wall bowing inward under soil pressure is a different problem again, handled with carbon-fiber straps or steel beams at $500–1,000 per strap. Sequence matters: get the independent report first, then bid the method it names.
Your situation, decided
| Situation | Verdict | Why |
|---|---|---|
| Hairline vertical crack in a poured wall | Repair (seal) | Curing shrinkage; a $500–1,500 injection keeps water out |
| Stair-step cracks in block, doors sticking | Repair (piering) | Settlement; piers at $1,000–3,000 each stabilize the footing |
| Basement wall bowing inward | Repair (reinforce) | Carbon fiber or steel at $500–1,000 per strap, not a rebuild |
| Water seeping through a crack after rain | Repair and regrade | Fix the drainage; the crack is a symptom of saturated soil |
| Crumbling mortar in an old stone foundation | Repair in sections | Repointing or a new footing section beats a full replacement |
| Catastrophic failure after a slide or sinkhole | Replace | The rare case where a $20,000+ lift and re-pour is justified |
What each path costs
Repairs typically run $500–3,000 per repair; a replacement is $20,000–100,000 (rare) installed. A poured concrete foundation is built to last the life of the house, 100 years or more. Age is not the trigger here. Movement is, and movement gets repaired rather than replaced. Price your own number on the home maintenance cost calculator before you commit either way.
The repair-or-replace call is easy when you know the unit's age and service history. OnOtto keeps both, plus the maintenance that delays this decision for years.
Start your home's service log, freeFrequently asked questions
Which foundation cracks are actually serious?
Width and direction tell you. Vertical or near-vertical hairline cracks under about 1/8 inch in a poured wall are shrinkage and usually harmless. Cracks wider than 1/4 inch, cracks that taper open toward one end, and stair-step cracks following the mortar joints in block point to settlement. A horizontal crack running across a basement wall is the worst of them, because soil pressure is bending the wall inward. Mark both ends with a dated pencil line and re-check in 60 days.
Do I need a structural engineer or just a foundation contractor?
Bring in the engineer first whenever the number is going to be large. An independent structural engineer charges $400–800 for an inspection and a written report naming the cause, the method, and the scope, and sells no repairs of their own. You hand that report to two or three contractors and compare bids against identical scope. Skipping it means accepting a diagnosis from the company that profits from it, on work that can reach $10,000–40,000.
Can better drainage stop foundation movement?
It stops a great deal of it, because most residential settlement is a water story. Clay soil swells when wet and shrinks when dry, and the footing moves with it. Slope the grade away from the house roughly 6 inches over the first 10 feet, run downspouts 4–6 feet out or into a buried line, and keep gutters clear so the roof stops dumping thousands of gallons at the corners. Then walk the walls twice a year and log what changes.