Mudjacking Cost: Lifting Sunken Concrete Slabs

Quick reference: the terms that change the price

Four terms explain most of the gap between two quotes for the same job.

Cost by area and job

Most contractors price by the section or the area, with a minimum call-out. A whole driveway costs less per square foot than a single small slab because the minimum is spread over more area.

Mudjacking versus polyurethane foam

Mudjacking uses a cement, soil and water slurry pumped through holes in the slab. It is cheap, strong and stable, but it is heavy and the slab must be drilled. Polyurethane foam expands to fill voids, adds little weight and cures in minutes, which matters under interior floors or where soil is weak.

For a driveway panel, slurry is usually enough. For a sunken garage floor, a pool deck or a slab with plumbing underneath, the lighter foam can be the safer choice. Get both prices before deciding.

What lifting can and cannot fix

Lifting works when the slab is sound but has settled. If the concrete is cracked into several pieces, crumbling or heaving, lifting does not solve the problem. If the soil under the slab is washing away, the drainage must be fixed first, or the slab settles again.

A trip hazard is sometimes solved by grinding the raised edge ($100 to $300) instead of lifting. Grinding is cheaper and faster when the height difference is small.

How the process works

The crew drills small holes in the slab, pumps the material underneath and watches the surface rise to the target level. The holes are patched and the site cleaned up. Most jobs take a few hours and the slab can usually be used the same day for foam, or after the slurry sets for mudjacking.

Ask how they measure the lift and what happens if the slab cracks. A contractor who monitors the surface and stops at the right level is doing the job properly.

When lifting beats replacement

Lifting costs a fraction of replacement and keeps the existing surface. It makes sense when the slab is structurally sound, the settlement is local and the cause (drainage, a void) can be corrected.

Replacement is the better answer when the slab is broken into pieces, the base is gone, or the slab is at the end of its life. A $1,500 lift on a failing driveway is money spent twice.

What changes the price

Access. A slab behind a fence or tight side yard takes longer. Depth of lift. A larger lift needs more material and more time. Number of holes. More holes mean more patching. Material. Foam costs more per square foot than slurry. Minimum charge. Small jobs pay the call-out.

Ask for the area, the number of injection points and the material in writing before comparing quotes.

A worked example: a sunken driveway panel

A 100 sq ft driveway panel has settled about 1 inch at one corner and holds water. Mudjacking at $3 to $6 per square foot is $300 to $600, but the minimum charge of $400 to $800 applies, so the quote lands around $700. Foam at $5 to $25 per square foot is $500 to $2,500, likely near the top for a small area.

Grinding the edge could remove the trip hazard for $100 to $300, but it does not fix the ponding. That is why the diagnosis matters more than the per-square-foot rate.

Permits, drainage and the base

Lifting usually does not need a permit, but the cause of the settlement does need attention. Regrade the soil so water runs away from the slab, extend downspouts and fix leaking irrigation. Lifting without fixing drainage is a repeat repair.

If the house is settling too, that is foundation work and needs an engineer, not a concrete lifting crew.

Maintenance after lifting

Keep water away from the slab, avoid heavy loads on the lifted area while it cures, and watch the patched holes for a few weeks. A small crack at a patch is normal; a slab that lifts again points to an unfixed void.

Sealing after lifting helps with surface protection but does nothing for the base. Address the water first, then the surface.

Mistakes to avoid

• Lifting a slab that is broken into pieces instead of replacing it.
• Skipping the drainage fix, so the slab settles again.
• Choosing the lowest bid without knowing the material (slurry or foam).
• Ignoring a minimum charge and being surprised at the invoice.
• Grinding a trip edge when the real problem is a void under the slab.

Choosing a lifting contractor

Ask what material they use, how they measure the lift, how many injection points they plan, and what happens if the slab cracks. A contractor who monitors the surface and stops at level is doing the job properly.

Ask for photos of similar lifts and a written scope that names the area, the material and the drainage work. Lifting without fixing the cause is a repeat job.

Foam or slurry by slab type

Both methods work on many slabs; the choice is usually about weight, cure time and access rather than whether the slab can be lifted at all.

What to expect on lift day

The crew drills small holes, pumps the material and watches the slab rise. Holes are patched and the site is cleaned. Foam allows use within hours; slurry needs about a day to set.

Keep vehicles off the lifted area until the contractor says it is ready, and watch for new cracks at the patched holes over the first weeks.

Access, depth and injection points

A slab with easy access lifts faster than one behind a fence. A larger lift needs more material and more time, and more injection points mean more holes to patch. All three lines move the price more than the per-square-foot rate suggests.

Ask how many injection points are planned and why. A quote that prices only the area may not include enough points for the lift you need.

Lifting versus replacement at a glance

The decision is about the slab and the base, not about the budget alone. A low lift price on a failing slab is money spent twice.

Drainage fixes that stop repeat settlement

Water is the usual cause of settlement. Regrade the soil so it slopes away, extend downspouts, fix leaking irrigation and keep the lawn from holding water against the slab. These are cheap compared with a second lift.

If a downspout dumps water next to the driveway, moving it is a $100 fix that can prevent a $1,500 lift. Look at the water first.

Lifting small versus large areas

A single panel is dominated by the minimum charge, while a whole driveway spreads mobilisation over more area and costs less per square foot. That is why the same per-square-foot rate can produce a $700 quote for one slab and a $5,000 quote for a driveway.

Ask for a price per section and a total, so you can see how the minimum is being applied.

Warranty, guarantees and insurance

Ask what the contractor guarantees: the lift height, the patching, or just the workmanship on the day. Most lifting warranties are short, because settlement depends on the soil and drainage that the contractor may not control.

Confirm they are insured and licensed where required. Lifting involves drilling and pumping under a slab, and damage to utilities is a real risk.

A second example: a sunken pool deck

A 150 sq ft pool deck that has settled toward the pool is a common lift. Foam is usually the better choice because it is light and cures fast, but the deck may also need a drainage fix and a slip-resistant finish.

Budget $900 to $1,600 for the lift plus any drainage and resurfacing. Lifting without fixing the water that caused the settlement is a repeat repair.

Can I use a DIY foam kit?

DIY foam kits exist for small slabs and are much cheaper than a contractor. They work best on one small, flat panel with clear access and a simple lift. They are a poor fit for a driveway, a pool deck or anything with utilities underneath.

If the cause is drainage, a kit does not fix it. The money is better spent on the drainage first.

What the lift price does not include

Lifting usually does not include drainage repair, resurfacing, sealing, crack repair or replacement of broken sections. Those are separate lines that decide whether the lift lasts.

Ask for a complete scope: lift, holes patched, drainage, and any surface repair. A cheap lift on a slab that still holds water is not a good deal.

Lift height and material volume

A one inch lift needs less material than a three inch lift, and the number of injection points grows with the area and the target height. That is why two quotes for the same square footage can differ.

Ask how the contractor measures the target height and how much material they expect to use. A written estimate of the lift is a sign of experience.

A pool deck: lift plus drainage

Pool decks settle for a reason: water gets under the slab. A lift restores the level, but the drainage and the joint between the deck and the pool shell need attention too.

Budget the lift at $900 to $1,600 for 150 sq ft, plus drainage and a slip-resistant finish. Skipping the water fix is how decks settle twice.

Comparing two lifting quotes

Make both quotes name the area, the material (slurry or foam), the number of injection points, the lift target and the drainage work. Then compare the totals.

A lower price with fewer injection points may not lift the slab. A higher price with drainage included may be the cheaper repair over five years.

Lifting sidewalks and pool decks

Public sidewalks and pool decks are common lift jobs, but the rules differ. A city sidewalk may be the municipality's responsibility, and a pool deck needs a slip-resistant finish and a drainage plan.

Check who owns the slab before paying for a lift. Lifting a sidewalk that the city is due to replace is money wasted.

What to budget for a whole driveway

A whole driveway lift at $3,000 to $6,000 is usually cheaper than replacement, but it only makes sense if the slabs are sound and the settlement is uniform. If some panels are cracked and others are level, a partial lift plus patching can be the better mix.

Ask for the lift priced by section, so you can choose which panels to fix now and which to leave.

What lifting does to the surface

Lifting restores the level but does not renew the surface. The drilled holes are patched, and the repaired spots may show. If the slab is stained or spalled, plan a resurfacing or sealer after the lift cures.

A lifted slab can also develop new cracks at the patch points or along the lifted edge. Ask how the contractor handles that, and keep an eye on the patched areas for the first few months.

Lifting near trees, pools and utilities

Roots, pool shells and buried utilities all affect how a slab can be lifted. A contractor should locate utilities before drilling and should know how close to a pool the material can be injected.

If a tree root is lifting the slab, mudjacking under it may not solve the problem. The root may need to be removed or the slab redesigned, which is a different job.

How long a lift lasts, and the follow-up

Most lifts last a decade or more when the drainage is corrected; a lift over an unfixed void can settle again within a couple of years. Watch the patched holes and the lifted edge for the first wet season.

Keep water away from the slab, avoid parking heavy vehicles on a freshly lifted area, and fix any new ponding immediately. The follow-up is simple and it is what makes the lift last.

Lifting on a budget: which sections first

If the whole driveway needs attention but the budget does not, fix the sections that carry the most traffic or slope toward the house first. Water running toward the foundation is a bigger problem than a low spot at the street.

Ask for a section-by-section price so you can phase the work. Lifting two panels now and the rest next year is often better than one cheap job that leaves the worst section untouched.

How to tell if a slab is a lifting candidate

Walk the slab and note where water stands, where the surface has dropped and whether cracks are wide or tight. A sound slab with a local low spot is a good candidate; a slab that rocks when you step on it, or has cracks running in several directions, usually has a base failure that lifting will not fix.

Take photos with a straight edge or a level across the low spot. That record helps the contractor quote the right lift and helps you compare two quotes on the same problem.

What this guide does not cover

Some jobs depend on things a national range cannot see. These are the ones where you need a local quote or an engineer.

• Structural foundation movement, which needs an engineer.
• Sewer or utility failures under the slab.
• Full slab replacement, priced separately.
• Engineered lifting for commercial or heavy loads.
• Permits and inspections that vary by city.

Concrete lifting prices and contractors by state

Ranges here are national with a checked month. Local prices move with labour rates, climate and permit rules, so check your state before comparing bids.

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