Your neighbor had three walk panels lifted last summer and mentioned what it cost. You've got three panels too. So why might your quote be different?
Because a tape measure only reads the top of the slab. Most of what drives the price is underneath it, and two slabs the same size can need very different amounts of foam, drilling, and time.
Here's what actually goes into the price of foam concrete leveling, so you know what you're paying for and how to get a quote that holds.
The Factors at a Glance
| Factor | What we're looking at | How much it moves the price |
|---|---|---|
| 1. Empty space underneath | How big the gap under the slab is | Often the biggest swing |
| 2. Lift height | How many inches the slab has to rise | Moderate to large |
| 3. Slab condition | One piece, cracked, broken, or tied to steps and walls | Small, or it changes the plan |
| 4. Number of holes | Drilling and patching needed for an even lift | Small to moderate |
| 5. Separate areas | Walk, driveway, and patio in different spots | Moderate |
| 6. Getting the hose there | Distance from where we park, and what's in between | Small to moderate |
| 7. Add-ons | Joint and crack caulking | Small to moderate, priced by the foot |
| 8. Job minimum | Fixed cost of showing up and setting up | Sets the floor on small jobs |
| 9. Square footage | How much concrete needs to move | Sets the baseline, but predicts less than you'd think |
1. The Empty Space Underneath
Slabs don't drop because the concrete got heavier. They drop because something under them left. Rain and snowmelt sneak in through open joints and carry soil away, loose fill packs down, and a pocket opens between the dirt and the bottom of the slab. Until that pocket is full, the foam isn't raising anything. It's just taking up room.
Clues that you've got a big pocket:
- A hollow sound when you tap the slab, or a corner that rocks under your foot.
- A visible gap along an edge, big enough to slide a screwdriver or a finger into.
- Washed-out soil at the edge, often right where a downspout or sump line empties.
- A spot next to the foundation, where the loose backfill from when the house was built keeps settling for years.
This one thing decides whether a quote lands at the low end of a range or the high end.
2. Lift Height
Once the pocket is full, every bit of rise takes more foam on top of it. Picture a garage apron that tipped down at the door: the gap has to be filled first, then the whole edge has to be pushed back up until it meets the garage floor again.
There's a practical ceiling. Concrete that has to come up a long way is more likely to crack on the way, and a slab tied into steps, a wall, or a neighboring slab can only travel so far. If yours is close to that line, you'll hear it from us before anybody drills.
3. Slab Condition
Foam raises the concrete you have. It doesn't put broken concrete back together.
- Cracked, but in one piece: Usually fine. We lift it as a unit and can caulk the crack afterward.
- Broken into a few large pieces: Sometimes liftable, with more holes and more care. Expect the price to reflect it.
- Shattered, crumbling, or badly flaking: Not a lifting job. Paying to raise concrete that needs to be replaced anyway is wasted money, and we'll say so.
- Heaved up instead of sunken: Foam only raises concrete. We can sometimes raise the slabs around a heaved one to soften the edge, but we can't push it down.
4. Number of Holes
We drill 5/8" holes, about the size of a dime, spaced so the foam spreads and the slab rises evenly. Bigger slabs, odd shapes, and slabs that need to tilt back into place get more holes. Every hole gets drilled, injected, and patched, so hole count adds labor. It's a smaller factor than foam, but it's real.
5. Number of Separate Areas
Three panels in a row on the front walk is one setup. A front walk, a back patio, and an AC pad on the side of the house is three setups, with hose moved, equipment repositioned, and drilling started over at each.
Separate areas cost more than the same footage in one spot. But they cost far less together than as three separate visits, because you only pay the fixed costs once.
6. Getting the Hose There
We park and run hose to the slab. For a front walk, a stoop, or the driveway itself, that's a short pull. What adds minutes:
- A backyard patio on the far side of the house
- Gates and narrow side yards the hose has to work through
- A deck or post sitting on or over the slab
- Shrubs and edging tight against the concrete
None of these usually stop a job. They just add some time.
7. Add-Ons: Joint and Crack Caulking
Open joints, the gap along the house, and cracks are front doors for rain and snowmelt. That water running under the slab is usually how the pocket in factor 1 got there.
Caulking those spots during the same visit runs $5–$10 per linear foot, depending on how wide and deep the joints are and how much old caulk or rotted wood strip has to come out. Added to a lift, there's no separate caulking minimum. For example, a front walk and house gap with about 40 feet of joints would add roughly $200–$400. Booked on its own later, caulking has a $275 minimum, so on a small job like that, adding it to the lift is the better deal. It's one of the cheapest ways to help a lift last.
8. The Job Minimum
Every job has fixed costs: driving out, setting up and warming up the equipment, and cleaning up. Our minimum for a lifting job is $450. A single AC pad, sidewalk panel, or small stoop typically falls in the $450–$600 range.
The practical takeaway: if you have more than one problem spot, do them together.
9. Square Footage (Last on Purpose)
Size counts, just less than most people expect. Bigger jobs cost more in total but less per square foot, because travel, setup, and cleanup don't grow with the job.
National cost guides put foam lifting at roughly $5–$25 per square foot. The spread is that wide because a footage number can't see under the slab. A 100-square-foot slab that dropped a half-inch is a very different job from a 100-square-foot slab sitting over a washed-out hole. That's why size sits at the bottom of this list instead of the top. If you're weighing mudjacking cost against foam, concrete lifting cost compares them side by side.
Same Size, Different Price: Two Driveway Sections
Here's how those factors play out on the same 10×10 driveway section (about 100 square feet). Our typical range for one driveway section is $550–$800.
| Driveway A | Driveway B | |
|---|---|---|
| How far it dropped | About a half-inch at the garage | About 2 inches at the low corner |
| What's underneath | Small void, soil mostly intact | Washed-out gap from a downspout |
| Condition | One piece | One piece, one crack |
| Add-ons | None | Caulk the crack and joints |
| Where it lands | Low end of the range | High end of the range, plus caulking |
Same size slab. Very different amount of foam.
For typical prices by job, see concrete leveling cost in Green Bay, or our pricing page for how our other work is priced.
Want a More Accurate Photo Quote? Send These
Most of the guesswork in a quote is what's under the slab. Good photos close that gap.
- 1One wide shot of the whole area, so we can see how the slabs connect and where water runs.
- 2A close-up of the worst edge with a tape measure standing at the low side, so we can read the drop.
- 3Any visible gaps under the slab edges, especially near downspouts or the house.
- 4The path from the driveway to the work area, including gates, fences, or decks in the way.
- 5Downspouts and sump discharge near the problem area.
- 6A quick note: how long it's been sinking, whether it rocks, and whether it gets worse after winter.
Bonus points: measure the slab dimensions, and tell us if you want joints or the house gap caulked too.
What photos can't show: We can usually price a job from photos. If the void turns out much larger than the photos suggested, we'll stop and talk to you before going past the quoted range.
Ways to Keep Your Cost Down
- Bundle every problem spot into one visit.
- Don't wait several seasons. Voids usually grow as water keeps getting under the slab, which means more foam later.
- Fix the water source. Extend downspouts and redirect sump lines so the lifted slab stays put.
- Seal the joints while we're there, instead of scheduling it separately later.