How much settlement is too much to fix with leveling?

There's no firm threshold — it depends on the condition of the concrete and how much void space is beneath it. Slabs that have dropped 3–4 inches can often still be leveled successfully. We assess on-site.

Can I wait to fix a slightly settled slab?

You can, but settlement typically progresses. A void that's caused half an inch of drop today may cause two inches of drop in two years. Earlier repair tends to cost less.

Is a hollow sound under concrete always a problem?

It's a reliable indicator of a void — which is the precondition for settlement. A hollow slab that hasn't visibly moved yet may be a candidate for void filling before it drops.

Do I need to fix every crack in my concrete?

Not necessarily. Surface shrinkage cracks are cosmetic. Corner and edge cracks accompanying visible settlement are a different matter and worth addressing.

7 Signs Your Concrete Needs Leveling

Concrete settlement is progressive — it tends to get worse over time, not better. Catching it early, when the void beneath a slab is smaller and the lift is easier, usually means a lower repair cost and a longer-lasting result. Here are the signs to look for.

Sign 1: A Panel Has Visibly Dropped

The clearest sign: one section of a driveway, patio, or sidewalk has dropped relative to the adjacent sections. You can see the height difference at the joint. If you run water along the slab, it flows toward the low point.

Even small drops — half an inch to an inch — are worth addressing. Settlement tends to progress as the void beneath grows.

Sign 2: A Trip Hazard at a Panel Joint

When one sidewalk or patio panel has dropped (or risen) relative to the one next to it, the joint becomes a trip hazard — a raised or dropped edge that catches toes and wheels. This is the most common reason homeowners call us, and it's also a liability concern on public sidewalks.

Sign 3: Water Pooling on or Near the Slab

A properly sloped concrete surface sheds water. When a slab settles, it can create a low area that traps water rather than draining it. A puddle that lingers on your driveway or patio after rain — where it didn't used to — is a sign the surface has lost its original pitch.

Standing water on concrete also accelerates future settlement by infiltrating beneath the slab and eroding more soil.

Sign 4: A Gap Between the Concrete and the Foundation

When a porch slab, garage floor, or stoop has settled away from the house foundation, you'll see a gap between the concrete edge and the wall. This gap typically starts small — a quarter inch — and widens over time as settlement continues.

Beyond the aesthetic and trip-hazard problems, this gap is also an entry point for water, cold air, and pests.

Sign 5: A Hollow Sound When You Walk or Drive on It

Tap a settled slab with your foot or a rod and listen. Solid concrete on stable soil has a dull thud. A slab spanning a void beneath it produces a hollow, resonant sound — sometimes noticeably different across the same panel.

This hollow sound indicates a void beneath the concrete and is a signal that the slab is unsupported over at least part of its area.

Sign 6: Cracks at the Corners or Edges of a Panel

Settlement often shows first as cracking at corners and edges — areas where the slab cantilevers over a void and stress concentrates. A corner crack that's growing, or an edge that has separated from an adjacent surface, indicates active settlement beneath.

Not all cracks mean settlement — surface shrinkage cracks are normal. The key is cracking combined with visible height difference or hollow sound.

Sign 7: Your Garage Door No Longer Seals at the Bottom

When the garage floor (particularly the apron area just inside the door) has settled, or when the concrete driveway outside has settled relative to the floor level, the garage door bottom seal no longer makes full contact. You'll see light, feel drafts, or notice the seal wearing unevenly. This is a functional cue that the concrete transition has changed.

When to Call

If you're seeing one or more of these signs, the right move is a free estimate — not a wait-and-see approach. Settlement tends to accelerate once a void has opened beneath a slab, and a small void today is cheaper to fill than a large one next year.