Concrete leveling FAQ: methods, cost, and results

Last updated: October 2, 2026

What does it cost? Foam or mudjacking? How long does the lift hold? Concrete leveling raises the same handful of questions on nearly every call, and this page answers each one straight. Leveling raises a settled slab back to grade without tearing it out, and polyurethane foam cures in about 15 minutes, which means traffic goes back on the slab the same day.

Cost and value

Cost leads almost every call. Three answers cover most of it.

How much does concrete leveling cost per square foot?

Polyurethane foam leveling starts at $9.26 per square foot. The figure climbs with slab area, settlement depth, and any access that keeps the foam rig at a distance, and it sits above mudjacking’s $4.60 per square foot because foam buys a faster cure and a lift that doesn’t overload weak soil. The biggest drivers:

• Slab area: more square footage, more injection ports.
• Settlement depth: a 2-inch drop needs far more foam to fill the void than a 1/2-inch sag, and depth is the single input that moves total material the most.
• Port count: a denser settlement profile takes a tighter port grid.
• Access: a slab the foam hose can’t reach directly adds setup time before the lift starts.

Our concrete leveling service page walks the method in full.

Why does concrete leveling pricing vary so much?

Pricing swings on three inputs: slab area, settlement depth, and the number of injection ports the lift takes. A driveway with one trip edge needs a few ports and wraps in under an hour, while a warehouse floor sunk across several bays needs a dense port grid, real-time laser monitoring, and a full day on site before every bay reads flat again. Access stacks on top. A slab the foam hose can’t reach adds setup.

Is concrete leveling cheaper than replacing the slab?

Usually, and often by 30 to 50 percent. Replacement means demolition, haul-off, fresh concrete, and a 7 to 28 day cure before the slab carries load again. Foam leveling lifts the slab you already own in minutes. You pay once for the lift, traffic returns the same day, and the tear-out bill never exists.

Leveling methods: foam, mudjacking, and replacement

What is polyurethane foam injection?

Polyurethane foam injection, also called polyjacking, is the method Bel Covo uses on most slabs. We drill 5/8-inch holes through the settled concrete and pump two-part closed-cell foam underneath. The foam expands in roughly 15 seconds, fills the voids that let the slab drop, and raises the concrete in 1/8-inch increments. It cures in 15 minutes, weighs 2 to 4 pounds per cubic foot, and shrugs off water.

What is the difference between foam leveling and mudjacking?

Weight and cure time separate the two methods. Foam weighs 2 to 4 pounds per cubic foot, cures in 15 minutes, and injects through 5/8-inch holes. Mudjacking pumps a cement slurry that weighs over 100 pounds per cubic foot through 1.5 to 2 inch holes and needs 24 to 48 hours to set. Foam delivers finer lift control, and it doesn’t answer a soil failure by piling mass onto the soil that failed.

When is mudjacking the better choice?

Mudjacking earns its place on a stable, well-drained subgrade where the budget is tight and the slab isn’t headed for a coating. It’s cheaper per square foot. On expansive clay, which covers much of central Oklahoma, the slurry weight fights the lift, the 24 to 48 hour cure stalls the job, and the control is coarse. Foam is the safer pick there.

Why concrete slabs settle

Settlement is a soil problem wearing a concrete mask. The slab usually did its job; the dirt under it moved, and the concrete followed it down by a half inch, an inch, sometimes 2 inches or more.

What causes a concrete slab to settle?

Voids under the slab cause settlement, and 4 culprits open them. Poor compaction during the original build leaves the soil loose. Erosion from water nobody routed away washes subgrade out over years. Expansive clay swells and shrinks with each wet-dry cycle, a swell-shrink behavior measured under ASTM D4546. A plumbing leak quietly scours a channel underneath. The concrete stays sound; the support disappears.

How do I know if my slab needs leveling?

Trip edges, scraping doors, water pooling at the foundation, and a visible drop at one corner all point to leveling. Tap the low spot. A hollow, drummy sound means a void underneath the slab. Hairline shrinkage cracks on their own don’t call for a lift, but a section that has dropped 1/2 inch or more almost always does.

The process and downtime

The whole job runs on one box truck and a foam rig. Here’s the sequence.

How does the leveling process work step by step?

The process starts with diagnosis, not drilling. We read the cause of the settlement, map port locations across the settlement profile, then drill 5/8-inch holes and pump foam while a laser level tracks elevation in real time. The slab rises in 1/8-inch increments until it hits grade. We patch the holes flush, and when a finish follows, we confirm flatness with FF/FL readings per ASTM E1155 before leaving.

How long does a concrete leveling job take?

Most residential jobs of one to four slab sections finish in 2 to 4 hours. Fast. The foam cures in 15 minutes, so the slab is walkable almost immediately and usually takes vehicle traffic inside an hour or two, while a larger commercial floor can run a full day depending on the port count and the depth of the drop. The site stays clean throughout.

Can I drive on a leveled slab the same day?

Driving on a leveled slab the same day is the norm with foam. The material reaches working strength in about 15 minutes, and a typical driveway or garage section takes vehicle weight within 1 to 2 hours of the lift. That speed is the headline advantage over mudjacking, which holds the slab out of service for 24 to 48 hours while the slurry sets.

Durability of the lift

How long does concrete leveling last?

A foam lift lasts 10 to 20 years and often the remaining life of the slab. The foam doesn’t shrink, rot, or soak up water. It holds its volume under the concrete indefinitely, which is why re-settlement, on the rare occasions it shows up, traces back not to the foam but to water still flowing under the slab and eroding fresh soil. Fix the drainage at lift time and the repair is permanent.

Will the slab settle again after leveling?

A slab that has been leveled won’t settle again on its own. Foam fills the existing voids and stays put. A slab settles a second time only when a new void opens, and new voids come almost entirely from uncontrolled water washing out soil the original build left loose under the concrete, the same failure that dropped it the first time. We check perimeter drainage during the assessment and flag any water source that would undo a 10 to 20 year lift before a single 5/8-inch port goes in.

Does foam leveling work on expansive clay soil?

Foam is the preferred method on expansive clay, full stop. Central Oklahoma’s red montmorillonite clays settle because they can’t carry the load above them, so adding mudjacking slurry at over 100 pounds per cubic foot only deepens the problem. Foam at 2 to 4 pounds per cubic foot lifts the slab without loading the soil that already proved it can’t hold.

Leveling versus replacement

When should I replace a slab instead of leveling it?

Replacement is the right call when settlement runs past 2 to 3 inches, when full-depth structural cracks split the slab, or when the subgrade is unstable enough that any lift is temporary. Active sinkhole conditions, severe spalling, and widespread delamination also point to tear-out. We recommend replacement only when leveling would be a callback waiting to happen, because honesty is cheaper than a return trip. The concrete repair guide lays out the full repair-versus-replace line.

Does concrete leveling damage my slab?

Concrete leveling leaves a sound slab intact. The 5/8-inch injection holes are smaller than a dime and patch flush once the lift wraps. The foam adds almost no weight, and because the concrete rises in 1/8-inch increments under laser monitoring, it climbs evenly instead of cracking from a sudden shove. The slab comes out at grade and whole.

Pairing leveling with a finish

Can a settled slab be polished or coated after leveling?

A leveled, stable slab becomes a candidate for polished concrete, epoxy, an overlay, or stain. Yes, all of them. We confirm post-leveling flatness with FF/FL numbers before any finish work begins, because coatings want FF 25 and a polished concrete floor wants FF 50 or higher, and foam is the only leveling method that reliably hits those tolerances on Oklahoma clay.

The order matters, and people often propose the reverse: skip the lift, then grind the floor flat later. That doesn’t work, and the reason is simple. A grinder subtracts. It takes material off the top of the concrete and it has no mechanism for putting concrete back, so it cannot raise a slab that dropped. Every low spot stays exactly as low as it was.

What grinding a settled slab actually does is cut the high side down to meet the low side. On a section that dropped a half inch, that means removing a half inch of concrete across everything around it. You lose slab thickness where you need it most, you expose aggregate at a depth the floor was never finished for, and the reinforcement gets closer to the surface than anybody intended. The void under the sunken section is still there the whole time, still unsupported, still ready to take the slab down further the next time water runs through it.

Grinding has a real job on a floor that already sits at grade: taking out a trip lip at a joint, knocking down a curled edge, opening the surface for a coating or polish. Those are flatness problems measured in a fraction of an inch. Settlement is an elevation problem measured against grade, and it is a soil problem besides. Fill the void and lift the concrete first. Then grind, and grind for finish quality instead of trying to make a grinder do a jack’s work.

Why hire one contractor for both leveling and finishing?

One contractor closes the gap that sinks two-crew projects. Most leveling crews hand off a flat slab and leave; most finishing crews assume they’re starting with one, and the space between those assumptions is where re-work lives. When the same crew levels and finishes, the leveling spec matches the finish spec from the first day, and a single accountability chain covers the entire job.

Getting started with Bel Covo

What areas does Bel Covo serve for concrete leveling?

Bel Covo is headquartered in Prague, Oklahoma, and our crews level slabs across central Oklahoma, the Oklahoma City and Tulsa metros, and the I-44 corridor. Mobilization for work outside the core area shows up plainly in the quote, never buried. The same crews carry the same standards to every job, so the lift reads identically wherever it lands. Reach us at (888) 852-3528.

How do I get a quote for concrete leveling?

Get your price in about 2 minutes through the online quote tool, or send a few photos of the settled slab with a rough measure of the drop. We’ll read it from there. No callback wait, no pressure, and a range built on real installed data. When a finish follows the lift, one quote covers both the leveling and the coating or polish.