Foundation Cracks on a Home Inspection: Which Ones Are Serious?

What does a foundation crack on a home inspection report mean?

It means the inspector saw a crack in a basement or crawl space wall, the slab, or the exterior foundation and is telling you to pay attention to it. Home inspectors are not engineers and don't diagnose structure, so the wording is cautious on purpose. You'll usually see one of these:

• "Typical shrinkage cracks noted, monitor." Thin vertical or slightly diagonal cracks in poured concrete. Inspectors write this one often, and it's the least worrying.
• "Crack noted with evidence of moisture intrusion" or "efflorescence at crack." The crack is letting water in. Usually a sealing job plus fixing the water outside. See the wet basement page.
• "Step cracking observed in block foundation wall." The crack follows the mortar joints like a staircase. Something moved.
• "Horizontal crack and/or inward deflection noted. Recommend evaluation by a licensed structural engineer." This is the one that matters most. Soil is pushing on the wall from outside.
• "Evidence of prior repair" such as straps, anchor plates, patched cracks or piers. Not bad by itself, but you want the paperwork and any transferable warranty.

Concrete cracks. The National Ready Mixed Concrete Association says plainly that "some cracking is normal in concrete basement walls" and that cracking "is not necessarily a sign of poor materials or workmanship or a structural problem" (NRMCA, Cracks in Residential Basement Walls). Your job is to sort the normal ones from the ones that are telling you something.

What causes foundation cracks in central Indiana homes?

Four things do most of the damage here, and three of them are about water.

• Shrinkage. Concrete shrinks as it dries and cures. When the wall is held in place by the footing, it cracks, usually vertically. The NRMCA lists this as the main reason basement walls crack (NRMCA). This is the harmless one.
• Wet, heavy soil. Much of central Indiana has poorly drained soil and a high water table in spring. Saturated soil is heavy, and it pushes sideways on a basement wall; that hydrostatic pressure is what's behind horizontal cracks and bowing. The wet basement page has the soil and water-table details.
• Freeze-thaw. Water-logged soil that freezes against a wall expands. Bob Vila lists frost heave alongside water pressure, backfilling too soon and heavy vehicles near the wall as causes of horizontal cracks (Bob Vila).
• Roof water dumped at the foundation. A downspout that empties at a corner keeps the soil against that wall soaked, so the crack is often right below it. Extending downspouts and grading are covered on the wet basement page.

Poured concrete vs. block basements

The type of wall changes what the cracks look like. Poured concrete walls get vertical shrinkage cracks and, under pressure, horizontal cracks or walls that tilt. Block walls are built from units and mortar, so they move along the joints: stair-step cracks, horizontal cracks along one mortar course, and bowing. In central Indiana you'll see both. Block shows up most in the older Indianapolis neighborhoods and post-war houses, and poured walls are what most of the newer Hamilton County subdivisions sit on. Plenty of houses here are on crawl spaces or slabs instead, and those crack differently. The crawl space page covers that side.

How much does it cost to fix foundation cracks and bowing walls?

Here are the fixes from cheapest to most expensive, with national cost figures. Your engineer picks the method; this is so you know what the bids should look like.

What each one does

• Injection fills the crack from inside. Epoxy bonds the two sides back together, and the NRMCA lists epoxy injection as a way to repair and stabilize cracks (NRMCA). Polyurethane foam expands to seal a leak and stays a little flexible. Neither one fixes a wall that's still moving.
• Carbon fiber straps are glued to the inside face of the wall, top to bottom, to stop further bowing. They're thin and can be finished over. They hold a wall where it is; they don't pull it back.
• Wall anchors are a steel rod through the wall to a plate buried in the yard. Acculevel, an Indiana foundation contractor, says the outside plate has to be at least 10 feet from the foundation and that anchors are generally recommended for walls bowing more than 2 inches (Acculevel). They can be tightened over time to pull some of the bow back.
• Piers are steel posts driven or screwed down to solid soil and attached to the footing. They're for settlement, not for walls pushed in from the side.
• Excavation and rebuilding is the last resort: dig out the outside, straighten or rebuild the wall, waterproof it and fix the drainage while it's open. It's the most expensive option by a wide margin.

Overall, This Old House puts the typical foundation repair at $2,224 to $8,134, about $5,179 on average (This Old House, updated October 2026). Add your own costs for moving finished walls, permits and landscaping. Angi lists permits at $100 to $2,000 depending on the city and scope (Angi).

Whatever the structural fix, fix the water too. A strapped wall sitting in the same soggy soil is still under the same pressure.

Should I ask the seller to fix a foundation crack or give a credit?

For a sealing job, either works. For structural work, I usually prefer a price reduction or credit plus your own engineer, because the person paying for the repair is the one who picks the contractor. Here's how it breaks down:

• Repair by the seller: make it specific. "Seller to have the north basement wall repaired per the recommendations in [engineer]'s report dated [date], by a licensed foundation contractor, with a transferable warranty, permits if required, and the engineer's follow-up letter confirming completion, before closing." Without that wording you can end up with the cheapest fix that technically counts.
• Credit or price reduction: you control the contractor and the method. Get two bids based on the engineer's report so the number is real. Loan programs cap how much a seller can credit toward closing costs, so a price reduction is sometimes the cleaner route. Your lender can tell you your limit.
• Walk away: if the engineer says the repair is extensive and the seller won't move, that's what the inspection contingency is for.

Timing is the trap. A structural engineer and two contractor bids can take longer than a short inspection period, so book the engineer the day the report comes in, or ask for an extension in writing. For how the response window works in Indiana, see how the inspection period works.

Can I seal a foundation crack myself?

A dry, hairline, vertical crack in poured concrete is a reasonable DIY job with a store-bought injection kit. Clean it, follow the kit directions, and mark the ends with a pencil and the date so you can tell if it grows.

Don't DIY anything structural. InspectApedia's advice on block walls is blunt: a crack from real movement "should not simply be sealed with caulk or epoxy," and the first step is to get roof water away from the building and find the cause (InspectApedia). Caulking over a horizontal crack hides the evidence an engineer needs, and a buyer's inspector will see the patch and ask what it's covering. If it's part of an inspection repair, use a licensed contractor and get a written warranty.

The DIY work that actually protects a foundation is outside: clean gutters, downspout extensions, and soil that slopes away from the wall. Those are covered on the wet basement page.