A crack or an uneven slab that looks minor is exactly the kind of thing people put off — and that hesitation is usually what turns a small repair into a full replacement. If something on your property has you wondering whether it’s worth calling someone, here’s how to tell what you’re actually looking at.
Warning Signs Worth Paying Attention To
Cracks wider than a quarter-inch, or ones that keep growing. A hairline crack is often cosmetic. A crack you can fit a coin into, or one that’s visibly longer than it was a few months ago, is a different story.
Sunken or heaved sections. If part of a slab sits noticeably lower or higher than the rest, something has shifted beneath it.
Pooling water that didn’t used to collect there. Standing water after rain, especially near your foundation or garage, is a sign the slope or drainage has changed.
Crumbling or flaking at the surface (spalling). This shows up as small chips or a rough, deteriorating texture on top of the concrete.
A slab that feels unstable or rocks slightly underfoot. If a section moves when you walk or drive over it, the base underneath has likely failed.
What’s Actually Causing These Problems
Cracks often trace back to soil movement, tree root pressure, or water that’s worked its way in and expanded when it froze.
Sinking sections usually mean the base beneath the slab eroded over time, or wasn’t compacted properly during the original installation.
Spalling is commonly linked to de-icing chemicals or a lower-quality original concrete mix.
Notice a pattern here — a lot of these problems trace back to how the concrete was installed in the first place. That’s not a coincidence, and it’s a big part of why choosing an experienced contractor over the lowest bid matters more than it might seem at the time.
Not Every Problem Needs a Full Replacement
This is worth saying plainly: a crack or a sunken section doesn’t automatically mean tearing everything out. Depending on what’s actually wrong, there are a few different paths forward:
Crack filling and sealing works well for cosmetic, non-structural cracks that aren’t actively growing.
Mudjacking or polyurethane foam lifting can raise a sunken section back to level without repouring the whole slab — a good option when the surface itself is still in decent shape but the base beneath it has settled.
Full slab replacement makes sense when damage is extensive, structural, or affects a large enough area that patching it would look worse than starting fresh.
A good contractor will tell you honestly which category your situation falls into, rather than defaulting to whichever option is more profitable for them.
The Cost of Waiting
Small problems rarely stay small. A crack that lets water in can undermine the base underneath it over the course of a single winter — turning what might have been a $200 repair into a $2,000 replacement once the damage spreads. Addressing an issue early is almost always the cheaper path, even when it doesn’t feel urgent yet.
Not Sure What You’re Looking At?
If you’ve got a driveway, patio, or walkway showing any of these signs and you’re not sure whether it’s a simple fix or something bigger, we’d rather take a look now than have you wait until it’s a bigger job. For general upkeep in the meantime, our driveway maintenance guide covers what to watch for and what’s normal wear versus what isn’t.
Send us a photo and we’ll tell you honestly whether it’s a repair or a replacement.