Foundation Crack Repair

Most minor crack-sealing and injection repairs in the local area range from about $500 to $1,500, depending on the length, width, and number of cracks. Cracks caused by settlement or structural movement cost more because they require stabilization such as piering or carbon-fiber reinforcement. We always provide a free on-site assessment and a clear, written quote before any work begins.

Thin, vertical hairline cracks are often cosmetic shrinkage cracks. However, horizontal cracks, stair-step cracks in block or brick, cracks wider than about 1/4 inch, or cracks paired with sticking doors and uneven floors can signal structural movement and should be inspected right away. When in doubt, have it evaluated — early repair is far less expensive than waiting.

The most common causes in the LA area are expansive clay soils that swell and shrink with moisture changes, seismic activity, poor drainage and plumbing leaks, soil erosion, and natural settling over time. Because Southern California soil moves seasonally, sealing the crack alone isn’t enough — we identify and address the underlying cause.

The method depends on the crack. We use low-pressure epoxy injection to structurally bond and seal cracks in poured concrete, polyurethane injection to stop active water leaks, and carbon-fiber straps or staples to reinforce walls and prevent cracks from widening. When settlement is the cause, we stabilize the foundation with piering or underpinning before sealing.

A properly injected crack itself won’t reopen, but new cracks can appear if the underlying cause isn’t fixed. That’s why we treat the root cause — drainage, soil movement, or settlement — not just the visible crack, and back our work with a workmanship warranty.

Most epoxy or polyurethane injection repairs are completed in a single day. Repairs involving carbon-fiber reinforcement, drainage correction, or foundation stabilization may take several days depending on the scope. We’ll give you an exact timeline with your quote.

Not always. Many cracks come from minor settling or concrete shrinkage and aren’t a sign of active sinking. But cracks that are widening, horizontal, or paired with uneven floors and sticking doors can point to ongoing settlement — which is why we measure movement and check the soil before recommending a repair.

It depends on the cause. Most policies exclude damage from gradual settling, soil movement, or poor drainage, but may cover cracks caused by a sudden covered event such as a burst pipe. We’ll document the damage and its likely cause to help with your claim — but always confirm coverage directly with your insurer.

Yes, but unrepaired foundation cracks almost always surface during the buyer’s inspection and can lower offers or delay closing. Repairing and documenting the work beforehand — ideally with a transferable warranty — protects your sale price and gives buyers confidence.

As a rule of thumb, thin vertical hairline cracks are usually cosmetic, while horizontal cracks, stair-step cracks, cracks wider than about 1/4 inch, or cracks that keep growing are more likely structural. The only sure way to know is a professional inspection — we measure the crack and check for related movement before giving you a straight answer.