Concrete Leveling Cost: Mudjacking vs. Polyurethane Foam (2026)

A sunken driveway slab, a sidewalk panel that has become a trip hazard, a patio that now drains toward the house — these are settlement problems, not concrete problems. The slab itself is usually fine; the soil underneath it moved. That distinction matters because it means you can often lift the slab back into place for a fraction of what tear-out and replacement would cost. In 2026, concrete leveling typically runs $500 to $2,000 for a residential job, while replacing the same concrete would cost two to five times that once you add demolition, hauling, forming, and a new pour.

There are two ways to do it: mudjacking (also called slabjacking) and polyurethane foam injection. Both work. They differ in price, cure time, hole size, and how long the fix lasts. Here is what each one costs, how they work, and how to decide — including the cases where leveling is the wrong call and you should replace the slab instead.

Concrete Leveling Cost at a Glance

Method	Cost per Sq Ft	Typical Job Total	Cure Time	Injection Holes
Mudjacking (slabjacking)	$3 – $6	$500 – $1,300	24–72 hours before heavy loads	1.5–2 in., several per slab
Polyurethane foam injection	$5 – $10	$800 – $2,000	15–30 minutes	~5/8 in., fewer needed
Full slab replacement (for comparison)	$9 – $13 (removal + new 4″ pour)	$2,500 – $6,000+	7 days before driving on it	—

The replacement line assumes roughly $2 per square foot for demolition and hauling plus $7–$10 per square foot for new 4-inch flatwork, which is what our concrete cost calculator uses for national averages. Either leveling method lands 50–80% below replacement on the same slab. In high-cost states like California, Connecticut, Massachusetts, and New York, expect all of these numbers to run about 20–25% higher; in low-cost states like Arkansas, Mississippi, and West Virginia, about 15% lower.

How Mudjacking Works

Mudjacking is the older of the two methods and has been used for close to a century. The crew drills a pattern of holes — each about the diameter of a soda can — through the sunken slab. A hydraulic pump then forces a slurry of water, soil, sand, and Portland cement (the “mud”) through the holes and under the slab. The slurry fills the voids left by settled or washed-out soil, and as pressure builds, it lifts the slab back to grade. The holes are patched with fresh concrete and the job is done in a few hours.

The slurry is heavy — on the order of 100+ pounds per cubic foot. That weight is mudjacking’s main long-term weakness: on soils that are already weak or poorly compacted, you are adding real load to the very ground that failed. Done over solid material it holds for many years; done over the same soft soil that caused the problem, it can slowly re-settle.

Mudjacking pros:

• Cheapest way to lift a slab: $3–$6 per square foot, $500–$1,300 for most residential jobs
• Inert, natural materials — essentially soil and cement
• Well suited to large, heavy slabs and big voids where foam volume would get expensive

Mudjacking cons:

• Larger drill holes (about 2 inches) that stay visible after patching
• 24–72 hours before the slab can take vehicle traffic
• The slurry adds weight to already-weak soil, so re-settlement is more likely
• Typical service life of 5–10 years, sometimes less on poor soil

How Polyurethane Foam Leveling Works

Foam leveling (often marketed as “polyjacking” or under brand names like PolyLevel) follows the same logic with different material. The crew drills much smaller holes — about 5/8 of an inch, the size of a dime — and injects a two-part polyurethane resin. The components react under the slab, expanding into a rigid foam that fills voids and lifts the concrete with surprising precision. Technicians can feather the lift in fractions of an inch, which matters when you are matching a sidewalk panel to its neighbor.

The foam weighs about 2–4 pounds per cubic foot — a rounding error compared to cement slurry — so it adds essentially no load to the soil below. It is also closed-cell and hydrophobic, meaning it will not wash out or absorb water the way soil fill can. It reaches roughly 90% of full strength in 15–30 minutes, so you can park on the driveway the same afternoon.

Foam pros:

• Cures in minutes, not days — drive on it the same day
• Tiny injection holes that nearly disappear after patching
• Ultra-light, so it does not burden weak soil; resists water washout
• More precise lift control; typical service life of 10+ years, and many installers warranty it that long

Foam cons:

• Costs more: $5–$10 per square foot, $800–$2,000 for typical jobs
• Material cost climbs fast when voids are very large
• Quality depends heavily on the installer — this is a specialty trade, so vet the company

Which One Should You Choose?

Choose mudjacking if…

• Budget is the deciding factor and the soil underneath is fundamentally sound
• You are lifting a large slab with big voids, where foam material costs would balloon
• Cosmetics are secondary — a garage floor or back-lot pad rather than a front walk

Choose foam if…

• You need to use the surface immediately (driveways, garage aprons, business entries)
• The settlement was caused by water — foam will not wash out the way slurry and soil can
• The soil is weak and you do not want to add a hundred pounds per cubic foot on top of it
• Appearance matters and you want the smallest possible patch marks

For a typical sunken sidewalk panel or a two-slab driveway section, the real-world price gap between the methods is often only $300–$500. Given foam’s longer expected life and same-day cure, many homeowners find the premium worth it. But an honest mudjacking job over stable soil is a legitimate, durable repair at a very fair price — there is a reason both industries still exist.

When Leveling Works — and When You Need Replacement

Leveling only makes sense when two things are true: the slab is structurally intact, and the settlement has stopped or its cause can be fixed. A slab is a candidate for lifting if it has sunk as a unit (or in a few large, sound pieces), the cracks are hairline or clean single breaks, and the surface itself is in good shape.

Replacement is the right call when:

• The concrete itself is failing. Widespread spalling, crumbling edges, or a surface that is flaking apart cannot be fixed from below. Lifting bad concrete just gives you level bad concrete.
• The slab is badly cracked. Once a panel has broken into many small pieces, injection pressure lifts them unevenly — you end up with a shattered slab at a new height.
• Settlement is ongoing. If the soil is still consolidating, or an unresolved washout is actively removing material, any lift is temporary. Fix the cause first or replace with proper base preparation.
• The slab has sunk dramatically. Beyond roughly 2 inches of settlement, lifting is still possible but costs converge with replacement, and a very large void hints at a soil problem that needs more than fill.

If you are pricing the replacement route for a walkway, our guide to concrete sidewalk cost breaks down the $7.50–$10.50 per square foot installed range; for patios and garage floors, see the concrete slab cost guide. And note that leveling contractors deal with slabs, not foundations — if the sinking concrete is your home’s footing or foundation wall, that is a different trade and a different budget; see our foundation repair cost guide.

Warning: Fix the Cause or It Sinks Again

This is the part too many estimates skip. Concrete does not sink for no reason. The usual culprits are downspouts dumping water at the slab edge, poor grading that channels runoff under the concrete, plumbing or irrigation leaks, tree roots, and fill soil that was never compacted when the house was built. If water washed out the base once, it will wash out slurry or the soil around new foam just the same.

Before — or alongside — any leveling work: extend downspouts at least 4–6 feet from the slab, correct grading so water moves away from the concrete, seal the joints and cracks after the lift so surface water cannot get underneath, and fix any leaking lines. A good leveling contractor will point out the cause of settlement during the estimate. If the estimator lifts slabs without ever asking where the water goes, keep shopping. The same principle applies to driveways: our concrete driveway repair guide covers which cracks are cosmetic and which signal base failure.

Why There Is a Minimum Charge — Even for One Small Slab

Homeowners are often surprised that leveling one sidewalk panel costs $500–$800 when the per-square-foot math suggests $150. The reason is that most of the cost is not the material — it is getting a truck, a pump or foam rig, and a trained two-person crew to your address. The equipment for foam injection in particular is a purpose-built trailer running heated hoses and proportioning pumps. Whether the crew injects 5 square feet or 500, the drive time, setup, and teardown are the same. Nearly every leveling company therefore carries a $500–$800 minimum. If you only have one small trip hazard, ask neighbors whether their walks need attention too — combining two or three small jobs on one street often gets everyone a better rate.

How Long Does Concrete Leveling Last?

Mudjacking typically holds for 5–10 years; polyurethane commonly lasts 10 or more, and the foam itself is effectively permanent — when a foam-lifted slab moves again, it is almost always because the surrounding soil kept moving, not because the foam failed. Warranties tell the story: mudjacking warranties usually run 1–2 years, while established foam installers frequently offer 5–10 years. Whichever method you choose, get the warranty in writing and confirm it covers re-lifting, not just materials.

Get Matched With Leveling Contractors Near You

Prices for slab lifting vary more by region and installer than almost any other concrete service, so it pays to compare two or three bids — ideally one mudjacking and one foam quote for the same slabs. Tell us about your sunken concrete and we’ll match you with vetted local pros: get free quotes from local contractors. It takes about a minute, and there is no obligation.