We just got a home inspection done and saw some cracks. What do they mean and do we need to fix them?

Most cracks an inspector flags are minor and stable, and the fix runs around $1,000 to $3,000 for a single crack injection. The ones that need real attention are the cracks moving the wall: horizontal cracks, stair-step cracks in block, or a wall bowing inward. We do free inspections across New Hampshire, Maine, and Massachusetts, and we tell you which kind you have before you spend a dollar.

First, breathe. An inspection note is not a verdict.

A home inspector’s job is to write down everything. A line item that says “foundation cracking observed” can mean a hairline shrinkage crack that has been sitting still since 1985, or a wall under real pressure. Those two get treated very differently. Here is how we read them.

Vertical and hairline cracks are usually shrinkage. Concrete cures and shrinks, and you get thin vertical lines. They can let in water, but most of the time they are not structural. If yours is leaking, the repair is crack injection, epoxy or polyurethane, around $1,000 to $3,000 with a 10-year warranty on the injection.

Horizontal cracks are the ones we take seriously. A crack running side to side, especially partway up the wall, usually means soil pressure is pushing on it. In NH, frost heave is the driver: water in the disturbed backfill freezes, expands, and shoves the wall inward. Left alone, a horizontal crack tends to get worse.

Stair-step cracks in a block or brick foundation follow the mortar joints. Same story as horizontal: pressure from outside, worth a look.

A wall that bows or leans inward is the clearest sign of trouble. If you can lay a straightedge against the wall and see a gap in the middle, that wall is moving.

What actually fixes a moving wall

If the wall is bowing, we pick the fix based on how far it has moved.

Carbon-fiber straps lock a wall that has shifted a little. They bond to the wall and stop further inward movement. Around $850 each, with a 25-year warranty.

A power brace handles a wall that needs more muscle, or one you may want to slowly straighten over time. Around $1,300 per brace.

If the problem is the footing settling, not the wall flexing, that is a piering job. Helical or push piers go down to stable soil and hold the foundation. Helical piers run around $2,700 per pier for the first three, then $2,200 per pier after that, and carry a 25-year engineered warranty. Read more on our helical piers page.

Some inspection notes are about sagging floors, not walls. That points to support posts. A new lally column or floor support runs around $1,300 to $2,500, covered for 10 years. See supplemental support.

If the inspector flagged a rotted sill or beam where the wood meets the foundation, that is a sill and beam job, around $7,000 to $40,000. More on the sill replacement page.

We self-perform the structural lifting and helical work in-house. No handing it off.

You may not need anything yet

A lot of the cracks we look at do not need repair. They need watching. If a crack is vertical, thin, dry, and not growing, the right move is often to monitor it and seal it only if it starts to leak. We will tell you that to your face. You do not need to fix a crack that is not doing anything.

What we will not do is exterior excavation to “waterproof” a foundation. In our field experience, digging out the outside is a poor fix that tends to fail in about two to three years. The durable repair for water coming through a crack or the floor wall joint is interior drainage. If the inspection was really about a wet basement, that is the Forever Dry System, covered on the basement waterproofing page.

How NH soil plays into this

When your house was built, the crew dug a hole, poured the foundation, then pushed the dirt back in. That backfill is looser than the ground around it, so it drains slowly and holds water. Winter comes, the water freezes, and the pressure lands on your wall. That is why so many New England foundation cracks show up on the same side of the house, and why frost is the usual culprit.

For peace of mind on the structural read, the Insurance Information Institute has plain guidance on foundation issues and what to document. If your inspection also flagged radon, the EPA sets the action level at 4.0 pCi/L and says to consider fixing between 2 and 4.

We back our structural repairs in writing. The full 603 guarantee lays out every warranty term.

Get a real read before you decide

Bring us the inspection report. We will come out, look at the actual crack, and tell you whether it is a watch-it or a fix-it. Free inspection, free estimate, quote within 24 hours.

Call us at 603-610-1770 or book your free inspection.

Related questions

Is a horizontal foundation crack serious? More than a vertical one, yes. A horizontal crack usually means soil pressure is pushing the wall in. It is worth a look. The fix is often carbon-fiber straps around $850 each or a power brace around $1,300 per brace.

Should I be worried if the crack is just leaking water? A leaking crack is usually a waterproofing problem, not a structural one. Crack injection runs around $1,000 to $3,000 with a 10-year warranty. If water is coming up through the floor wall joint too, ask us about the Forever Dry System.

Can a foundation crack hurt my home sale or insurance? It can come up in negotiation, which is exactly why an inspector notes it. Getting a written assessment and a repair plan from a licensed contractor helps. The Insurance Information Institute has homeowner guidance on documenting foundation issues.

How fast do you get me an answer? We do the inspection for free and get you a quote within 24 hours.