How much does foundation crack repair cost?
A single non-structural foundation crack injection often costs $500 - $1,500. Exterior crack repair can run $2,000 - $8,000+, and cracks tied to bowing, settlement, or wall movement can become $5,000 - $20,000+ stabilization projects.
The first question is not just how wide the crack is. It is whether the crack is leaking, moving, horizontal, stair-stepped, or connected to settlement or soil pressure.
Common foundation crack scenarios
Hairline shrinkage crack
$0 - $1,500How to tellThin vertical crack in poured concrete, stable over time, no movement signs
The fixMonitor, seal if leaking, and correct outside water sources
Leaking poured-concrete crack
$500 - $1,500How to tellWater tracks down one vertical crack after rain
The fixPolyurethane or epoxy injection, plus drainage/gutter checks
Block stair-step crack
$1,500 - $15,000+How to tellCrack follows mortar joints in steps, often near corners or openings
The fixInspect for settlement, soil pressure, drainage, and possible stabilization
Horizontal crack or bowed wall
$4,000 - $20,000+How to tellLong horizontal crack, wall leaning inward, or block face shifting
The fixWall anchors, braces, carbon fiber, drainage relief, and engineering as needed
How to document the crack
- Photograph the crack from far away and close up with a ruler or coin for scale.
- Mark the ends lightly with pencil and date it so you can tell whether it grows.
- Check whether water appears only after rain and where downspouts discharge outside.
- Look for matching signs: stuck doors, sloped floors, new drywall cracks, or exterior brick movement.
Unlock the hiring checklist
Use this before you call a foundation repair, so you know what to ask and what to avoid.
Call a pro when…
- The crack is horizontal, stair-stepped, widening, or wider than a typical hairline crack
- Water leaks through the crack repeatedly
- The wall is bowing, leaning, or bulging
- There are multiple cracks plus doors/windows sticking
- A buyer, inspector, or lender is asking for documentation
Repair or replace?
Stable non-structural cracks can often be injected or monitored. Cracks caused by movement need the movement addressed first. Sealing a moving crack without drainage or stabilization can make the wall look better while the real issue continues.
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Related questions
Are vertical foundation cracks serious?
Some vertical cracks are common shrinkage cracks, especially in poured concrete. They become more concerning when they leak, widen, offset, or appear with other movement signs.
Are horizontal foundation cracks serious?
Horizontal cracks are more concerning because they can indicate lateral soil pressure or wall movement. Get a foundation pro or engineer to inspect them.
Can I seal a foundation crack myself?
Small cosmetic cracks can be patched, but leaking or structural cracks need the source and movement checked. DIY sealant rarely solves recurring water pressure.
Should cracks be repaired from inside or outside?
Interior injection is common for poured-concrete leaking cracks. Exterior excavation may be needed when the outside waterproofing/drainage system is failing or the wall needs exterior access.