A sunken section of driveway, a tilted patio slab, or a garage floor that's dropped at one corner is a different problem than a foundation issue — even though it can look just as alarming. These are typically standalone concrete slabs that settled because of soil compaction or erosion underneath them, not your home's structural foundation.
Concrete leveling vs. foundation repair: what's the difference?
Standalone slabs
- Driveways, patios, sidewalks, garage floors
- Not structurally connected to the house
- Usually caused by soil erosion or compaction below
- Faster, cheaper fix
Structural foundation
- The slab or piers the house itself sits on
- Structural — affects the whole home
- Usually caused by expansive clay soil movement
- More involved, pier-based repair
If you're not sure which one you're dealing with, that's exactly what a free inspection is for. Treating a foundation issue like a simple concrete leveling job — or paying for foundation-level work on a problem that was really just a sunken driveway — both lead to wasted money.
How concrete leveling works
Polyurethane foam injection
Small holes are drilled into the sunken slab, and expanding polyurethane foam is injected underneath. The foam expands to fill voids and lifts the slab back to level, typically within 15 minutes of curing. This is the modern standard — lightweight, weather-resistant, and the holes are small enough to patch nearly invisibly.
Mudjacking (traditional method)
An older method using a cement-based slurry pumped beneath the slab to lift it. It works, but the material is heavier (which can contribute to future settling), takes longer to cure, and requires larger holes than foam injection.
Signs you have a concrete leveling issue (not a foundation issue)
- The sunken or uneven area is a separate slab — driveway, patio, walkway, garage floor — not part of the home's main structure
- No corresponding cracks, sticking doors, or sloping floors inside the house
- The slab settled gradually over time, often near a downspout, irrigation line, or area prone to erosion
If a sunken slab is attached to the house (like a garage floor that's part of the foundation system) and you're also seeing interior warning signs, this may be a foundation issue rather than a standalone leveling job — worth getting inspected before assuming it's the simpler fix.
What concrete leveling costs in Austin
| Area | Typical cost range |
|---|---|
| Small section (walkway, single slab) | $300 – $700 |
| Driveway (standard 2-car) | $800 – $2,200 |
| Patio | $600 – $1,800 |
| Garage floor | $700 – $2,000 |
Got a sunken driveway, patio, or garage floor?
Get a free inspection to confirm it's a leveling job, not a foundation issue.
How long does concrete leveling take?
Most jobs are completed in a single day. Foam injection cures within 15 minutes, meaning a driveway or patio is typically usable again the same day — a major advantage over full slab replacement, which can take a week or more including cure time.