Small dip in one area
A shallow depression collects water, but the surrounding driveway still feels solid underfoot and does not rock.
Start here: Start with drainage and surface condition. A localized patch may hold if the base is still firm.
Driveway Troubleshooting
Sinking Driveway
Direct answer: A sinking driveway usually means the base under the surface has settled, washed out, or was never compacted well enough. Small isolated dips can sometimes be patched, but broad settlement, rocking slabs, or repeated sinking usually points to a base problem that needs lifting or rebuild work.
Most likely: The most common cause is water getting under the driveway from poor drainage, edge erosion, or a nearby runoff path, then carrying fines away until the surface drops.
First figure out whether you have a shallow low spot in otherwise solid pavement, a slab that has dropped, or an active washout problem. That split matters more than the surface material. Reality check: a driveway that sank once and is still moving rarely stays fixed with a cosmetic patch alone. Common wrong move: adding more patch every season without fixing the water path that caused the settlement.
Don’t start with: Do not start by smearing sealer or filler over the low area. If the base underneath is still moving, the dip comes back and the patch usually breaks loose.
Best first checkLook for where water runs, stands, or exits near the sunken area after rain.
Big clueIf the driveway edge is crumbling or the surface sounds hollow, the support underneath is likely gone.
Last reviewed: 2026-04-05
What the sinking looks like
One concrete slab dropped lower than the next
There is a height difference at a joint, often with one slab lower and a visible lip you can catch with a shovel or tire.
Start here: Start by checking for voids, water washout, and joint movement. This usually needs lifting or pro repair, not just filler.
Edge of the driveway is sinking
The outside edge has settled, cracked, or broken away, often where soil beside the driveway has washed down or pulled back.
Start here: Start with side support and runoff. Edge settlement often keeps spreading if the shoulder soil is missing.
Driveway keeps sinking back after a repair
A patched area or filled crack looked better for a while, then the dip returned or widened after rain or winter.
Start here: Start by assuming the support below is still moving. Repeated movement points to an unresolved base or drainage problem.
Most likely causes
1. Water washing out the base under the driveway
This is the leading cause when sinking gets worse after storms, snowmelt, gutter discharge, or a nearby low area staying wet.
Quick check: After rain, look for runoff crossing the driveway, downspouts dumping nearby, muddy gaps at the edge, or water disappearing into joints or cracks.
2. Poorly compacted base from the original installation
A driveway can settle in one section even without obvious erosion if the stone base or fill below was thin or not compacted well.
Quick check: Check whether the dip has smooth edges and developed slowly over time without major cracking or wash channels nearby.
3. Edge support loss along the side of the driveway
Driveway edges fail sooner because they carry weight with less support, especially where the side soil has eroded away or vehicles run off the edge.
Quick check: Look down the side of the driveway for exposed edge thickness, missing soil, voids, or broken corners.
4. Cracked slab or broken pavement over a void
If the surface is cracked, rocking, hollow-sounding, or broken into pieces, the problem is no longer just cosmetic settlement.
Quick check: Tap concrete lightly and listen for hollow spots, or step near the crack line and see whether the section shifts.
Step-by-step fix
Step 1: Map the exact sinking pattern before you touch it
You need to separate a patchable low spot from a dropped slab or active washout. They can look similar from the street, but they do not get the same fix.
- Walk the full driveway and note whether the sinking is isolated, along an edge, at a joint, or spread across a larger section.
- Check after rain if possible, or use a hose lightly to see where water pools and where it runs off.
- Lay a straight board, level, or long shovel handle across the area to see how deep the dip really is.
- Mark cracks, settled edges, and any spots that sound hollow or move under weight.
Next move: You can clearly tell whether this is a shallow depression in solid pavement, a dropped concrete slab, or a larger failing section. If the whole area is uneven, heavily cracked, or hard to define because multiple sections have moved, treat it as a larger structural problem.
What to conclude: A small, stable dip may be worth patching. Movement at joints, hollow spots, or widespread cracking usually means the support below has failed.
Stop if:
- The surface rocks when you step on it.
- A concrete slab edge is high enough to create a trip hazard or tire impact hazard.
- You see a hole, open void, or undermined section large enough to catch a foot or wheel.
Step 2: Check for the water source that caused the settlement
Most sinking driveways are water problems first and surface problems second. If you miss the water path, the repair usually does not last.
- Look at nearby downspouts, sump discharge lines, buried drains, and roof runoff paths.
- Check whether water crosses the driveway, disappears into a joint, or washes along the side edge.
- Look for soil pulled away from the driveway edge, muddy staining, fresh erosion, or a soft shoulder beside the pavement.
- If the low spot is near the garage, check whether water is trapped there because the apron or surrounding grade is also low.
Next move: You find a clear runoff path, discharge point, or erosion area feeding the sunken section. If there is no obvious water source, poor compaction or long-term settlement becomes more likely.
What to conclude: Fixing drainage is part of the repair, not an optional extra. A patch over active washout is usually temporary.
Step 3: Decide whether the surface is still solid enough for a minor repair
A patch only works when the surrounding driveway is stable. If the surface is broken or unsupported, patch material becomes a short-lived bandage.
- For asphalt, press the area with your foot on a warm day and look for softness, pumping, or loose aggregate.
- For concrete, tap around the dip and joints and listen for hollow areas compared with solid sections nearby.
- Check whether cracks are narrow and stable or wide enough to show vertical movement.
- Look at the driveway edge thickness where visible and see whether the side support is intact or washed out.
Next move: The area feels firm, the surrounding surface is intact, and the dip appears shallow and localized. If the pavement is soft, broken, hollow, or moving, skip patching and plan for lifting, sectional repair, or replacement.
Step 4: Patch only a small, stable depression
This is the only DIY-friendly repair path on this page. It is for a shallow low spot in otherwise sound pavement, not for a slab that dropped or a driveway with active base loss.
- Sweep the area clean and remove loose debris, dirt, and any failed patch material.
- For a small asphalt depression in solid pavement, use driveway patch material made for low spots and feather the edges so tires do not catch it.
- For a shallow concrete low spot in sound concrete, use a concrete patch material rated for exterior use and follow the thickness limits on the product.
- Do not build up a thick patch in one pass over a deep sink. If the depression is substantial, the base problem is bigger than a surface skim.
- Recheck the nearby drainage path so water is not sent right back into the same spot.
Next move: Water no longer ponds in the dip, the patch stays bonded, and the surrounding driveway remains stable. If the patch cracks, loosens, or the area settles again, stop patching and move to lifting or rebuild evaluation.
Step 5: Move quickly on dropped slabs, repeated settlement, or edge failure
Once a driveway section has lost support, the lasting fix is usually lifting, base repair, or replacement of the failed section. Waiting tends to enlarge the void and break more surface.
- If one concrete slab has dropped but is otherwise intact, get estimates for slab lifting or void-filling from a qualified contractor.
- If the driveway edge is breaking because side soil washed away, rebuild the shoulder support and repair the damaged section before vehicles keep crushing the edge.
- If asphalt has broad settlement, soft spots, or repeated dips, plan for base repair and resurfacing or replacement of the failed area.
- If runoff, buried drain overflow, or downspout discharge caused the problem, correct that drainage issue at the same time or the driveway will keep moving.
A good result: You have a repair path that matches the actual failure instead of another temporary cover-up.
If not: If you cannot identify the water source or the settled area keeps expanding, bring in a driveway or drainage pro for site evaluation before more patching.
What to conclude: The final fix is often below the surface. Once support is gone, surface-only repairs are usually short-term.
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FAQ
Can I just fill a sinking driveway with patch and be done?
Only if the depression is small and the surrounding driveway is still solid. If the base underneath has washed out or the slab has dropped, patching alone is usually temporary.
Why does my driveway sink more after heavy rain?
That usually means water is getting under the surface and carrying support material away. Look hard at runoff, downspouts, buried drains, and edge erosion.
Is a sunken concrete slab repairable without replacing the whole driveway?
Often yes. If the slab is intact and the problem is settlement, lifting is commonly the better path than full replacement. If the slab is badly cracked or broken, replacement becomes more likely.
What if the driveway edge is the part that is sinking?
Edge settlement usually means the side support is gone. You need to address the washed-out shoulder or grading issue along with the driveway repair, or the edge keeps breaking down.
How do I know when this is too much for DIY?
If the area is moving, hollow, repeatedly sinking, or tied to drainage or washout you cannot fully correct, it is time for a pro. DIY patching is best limited to small stable depressions.
Will sealing the driveway stop it from sinking more?
No. Sealer can help protect a sound surface, but it does not rebuild missing support under the driveway. If the base is failing, sealing only hides the problem for a while.