What Kind of Contractor Do I Need for a Cracked Foundation?
Not every foundation crack is a crisis, but telling a cosmetic hairline from a structural problem is exactly what you want a professional eye for. The trade you need depends on what the crack is doing: a thin, stable crack is often just sealing; a widening, stair-step, or horizontal crack with a bowing wall is a structural repair; and sometimes the real fix is the water and soil pushing on the foundation in the first place.
Safety first
Horizontal cracks, a bowing or leaning wall, doors and windows that suddenly stick, or cracks wider than about a quarter inch can signal active structural movement. Get a professional assessment promptly rather than waiting.
The 3 trades this job usually needs
A single problem often spans several trades. Here is who does what, and why.
Assess the crack, and for structural cracks, stabilize the foundation with underpinning, piers, wall anchors, or carbon-fiber straps.
A moving or bowing foundation is a stability issue, not a caulk job.
Address the water and soil pressure driving the cracking — grading, drainage, and sealing.
Cracks often come back if the water pushing on the foundation is not managed.
Repair or repoint cracked block, brick, or poured concrete once it is stable.
The visible crack still needs proper patching after the cause is handled.
Not sure this matches your situation?
Describe what is happening in your own words and get a trade-by-trade breakdown for your exact problem — free, no account required. You can then reach out to any qualified pro.
Describe my problem →Common questions
Are all foundation cracks serious?
No. Thin, vertical, stable hairline cracks are common and often just need sealing. Horizontal cracks, stair-step cracks in block, widening cracks, or a bowing wall are the ones that point to structural movement and need a pro’s assessment.
Who assesses a foundation crack — an engineer or a contractor?
For anything that looks structural, a structural engineer can diagnose and specify the fix independently, then a foundation contractor does the repair. For a clearly minor crack, a foundation or waterproofing contractor can often advise directly.
Why does my foundation keep cracking after repair?
Usually because the cause — water, poor drainage, or soil movement — was not addressed. A durable fix handles the pressure on the foundation, not just the visible crack.
Can I seal a foundation crack myself?
A minor, stable, non-structural crack can sometimes be sealed as a DIY job. But if you are unsure whether it is structural, get it looked at first — sealing over a moving crack hides a problem that gets more expensive the longer it runs.