Direct answer: A cracked driveway is often caused by normal surface shrinkage, freeze-thaw movement, poor base support, or water washing out soil under the slab. The right fix depends on the crack pattern, width, and whether one side has lifted or sunk.
Most likely: If the crack is thin, fairly even, and the driveway surface is still level, it is usually a minor surface crack that may be patchable after cleaning and drying.
Start by looking at the exact crack shape and whether the driveway is still flat. A narrow hairline crack is a very different problem from a wide crack with one side higher than the other. Separate those branches first, then decide whether this is a simple surface repair, a drainage issue, or a structural problem that needs a contractor.
Don’t start with: Do not start by sealing every crack or coating the whole driveway. If the slab is moving, sinking, heaving, or breaking into multiple sections, patch material will not solve the underlying problem.
A thin crack with little or no height difference between sides, often straight or lightly branching.
Start here: Start with cleaning and measuring the crack width. If it stays narrow and the slab is level, it may be a cosmetic or minor patch branch.
The crack is easy to see, may catch a shoe or shovel, and one side has dropped.
Start here: Check for soil washout, poor drainage, or a weak base before considering any filler.
One side is higher, often after winter, and the surface may create a trip edge.
Start here: Look for frost movement, tree root pressure, or slab movement. This is usually not a simple filler repair.
The crack edges are breaking apart, flaking, or spalling instead of staying clean and solid.
Start here: Check whether only the surface is deteriorating or whether the slab underneath is also moving or breaking down.
Concrete and similar driveway surfaces can develop small cracks over time even without major structural failure.
Quick check: If the crack is narrow, the surface is still level, and there is no obvious sinking, this is a likely branch.
Water running along the driveway edge or under the slab can wash out support and let sections settle.
Quick check: Look for downspouts discharging nearby, erosion at edges, standing water, or voids under the slab.
In cold climates, trapped water in soil can lift sections and open or offset cracks.
Quick check: If the crack worsens in winter or spring and one side rises, frost movement is a strong possibility.
Repeated vehicle weight or poor compaction under the driveway can cause wider cracks and uneven sections.
Quick check: If the crack is in a wheel path, near the apron, or where the slab sounds hollow and has dropped, settlement is likely.
The pattern tells you whether this is likely cosmetic, movement-related, or a failing slab section.
Next move: If you confirm the crack is narrow and both sides are level, continue to cleaning and condition checks before deciding on a filler or patch. If the crack is wide, offset, spreading into multiple sections, or tied to sinking or heaving, treat it as a movement problem first.
What to conclude: Level hairline cracks are often patch candidates. Offset, widening, or repeating cracks usually point to base failure, water issues, frost movement, or root pressure.
Dirt, weeds, and loose material can make a minor crack look worse or hide crumbling edges that change the repair plan.
Next move: If the crack edges are solid and the opening stays small and even, a simple driveway crack repair branch may still be reasonable. If the edges keep crumbling, the crack widens below the surface, or pieces break away easily, the damage is more than a simple surface split.
What to conclude: A clean crack with sound edges supports a filler or patch branch. Crumbling edges suggest spalling, deeper deterioration, or slab breakdown that may need a larger repair.
A driveway that has lost support underneath will usually keep cracking even if the surface is patched.
Next move: If the slab feels solid, sounds solid, and stays level, the problem is more likely limited to the surface. If you find hollow spots, visible voids, or a dropped section, patching alone is unlikely to last.
Water is one of the most common reasons driveway cracks return after patching.
Repair guide: downspout clogged
Related repair guide: yard drain not draining
The best next step depends on whether the crack is stable and surface-level or part of a moving slab.
A good result: If the crack stays closed, level, and dry after repair, you likely addressed a stable surface defect.
If not: If the crack reopens quickly, widens, or changes height, the underlying support or movement issue was not resolved.
What to conclude: Stable cracks can often be patched. Moving cracks usually need correction of drainage, support, or slab replacement rather than repeated surface filling.
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Small hairline cracks can be normal with age, shrinkage, and weather exposure. A crack becomes more concerning when it widens, develops a height difference, or appears with sinking, heaving, or crumbling edges.
Only if the crack is stable, narrow, and level. If the slab is moving, losing support, or lifting seasonally, filler is usually temporary because the underlying cause is still active.
Look for one side higher or lower than the other, multiple connected cracks, hollow sounds, visible voids, or recurring movement after rain or winter. Those signs point to support or movement problems rather than a simple surface crack.
The most common reasons are water undermining the base, freeze-thaw movement, poor compaction under the slab, heavy loads, or root pressure. If the slab keeps moving, surface repairs tend to reopen.
Call a pro if the crack has offset edges, the slab is sinking or heaving, you find a void underneath, the damage is spreading quickly, or the driveway section may need lifting or replacement instead of patching.