A sunken apron is a section of driveway that has settled below its original level, usually at the street end or right in front of the garage. It's typically caused by a base that wasn't compacted well enough, water washing out or softening the material underneath, or soil settling over time. The result is a dip or lip that's uncomfortable to drive over, collects water, can be a tripping hazard, and tends to get worse each winter. The fix is to remove the sunken section, rebuild and compact the base, and repave it level with its surroundings. The sooner it's done, the smaller the repair.
Identifying the Problem
When an apron sinks, it usually leaves a step or gap where it meets the street, the garage slab, or the rest of the driveway. Water runs into that gap and works its way under the pavement, washing out or softening the base and making the sinking worse. Our guide on why the driveway apron matters explains why this section takes more abuse than any other part of the driveway.
Watch for these early signs:
- A bump or dip you feel every time you drive in or out
- Puddles that sit at the street end or in front of the garage after rain
- Cracks running across the apron or along the joint with the street or garage slab
- A visible gap or lip between the apron and the adjoining surface
Causes of a Sunken Apron
The most common cause is a base that wasn't properly compacted when the driveway was built. The apron carries every vehicle that enters or leaves, so any weakness underneath shows up there first. Trenches dug across the driveway for water, sewer, or utility lines that weren't compacted properly when they were backfilled can also settle over time.
Water makes all of it worse. Poor drainage at the street or a downspout emptying toward the garage softens the base, and Connecticut's freeze–thaw cycles turn that water into ice that lifts the pavement in winter and leaves voids underneath when it melts in spring. If water is the root cause, fixing the drainage and grading matters as much as fixing the pavement.
Steps to Repair a Sunken Apron
- Assessment: Determine how far the sinking extends and why it happened. Check the street joint, the garage slab, and the surrounding pavement for cracks, and look at where water is coming from.
- Removal: Saw-cut and remove the sunken section, along with any cracked pavement around it, down to the base.
- Rebuild the base: Dig out soft or contaminated material, replace it with suitable processed stone, and compact it thoroughly in layers. This step is what keeps the apron from sinking again.
- Repave: Install new hot-mix asphalt, or concrete if that's what the apron is made of, and compact or finish it level with the street, the garage slab, and the rest of the driveway, pitched so water runs away.
- Cure and protect: Keep traffic off until the new section is ready. Asphalt is usually drivable in a few days; concrete needs longer to gain strength before it carries cars.
If the apron is at the street, part of it may sit in the town's right-of-way. Many Connecticut towns require a permit for work there, so check with your town's public works or engineering department; a contractor who does this work regularly should know the local requirements. For a concrete apron or curb, see our concrete curbing and aprons service; for asphalt, our driveway repair crews handle it.
Preventing Future Problems
A well-compacted base is the best prevention, which is why it should be the first thing you ask about when you get a quote for a new driveway or apron. After that, keep water moving: downspouts directed away from the driveway, edges clear so runoff can escape, and no low spots where puddles sit.
Look at the apron each spring after the frost leaves the ground, when settling and heaving are easiest to spot, and fill any cracks before the next winter. Catching a small dip early keeps it a small repair.
Have a sinking apron at the street or garage? Contact Maisano Brothers for a free estimate.
