Concrete Leveling in St. Louis, MO: Methods and Costs (2026)
Uneven concrete is one of the most common exterior repair calls in the St. Louis metro, from tripping hazards on sidewalks in Tower Grove South to sunken garage aprons in Ballwin and Chesterfield. Concrete leveling covers a couple of different repair methods, mudjacking and polyurethane foam injection being the two used most often locally, and choosing between them depends on the size of the slab, how much lift is needed, and what's happening with the soil underneath. This guide walks through what concrete leveling costs across the St. Louis area, how the two main methods compare, and how to tell whether a sunken slab is a simple leveling job or a sign of a bigger drainage or foundation problem.
By Jason Green · Foundation Repair · Published August 28, 2026 · 8 min read
What causes uneven concrete in St. Louis
Slabs throughout the St. Louis metro settle unevenly for a few predictable reasons: poor soil compaction under the original pour, erosion from heavy spring rainfall washing soil out from under slab edges, and freeze-thaw cycling through winter that gradually enlarges small voids beneath the concrete. Older neighborhoods with clay-loam soils and aging storm drainage infrastructure tend to see this more often than newer subdivisions with modern grading standards.
Trees and their root systems are another common local cause, particularly in mature neighborhoods like Webster Groves and University City, where large street trees can heave sidewalk sections as roots grow beneath them, a different mechanism than settlement and one that sometimes requires root pruning or a barrier before leveling will hold.
Mudjacking as a leveling method
Mudjacking pumps a soil-cement slurry under a sunken slab through drilled holes, using the material's volume and pressure to lift the concrete back toward level. It's a well-established method in the St. Louis market and costs less per square foot than foam, making it a common choice for larger driveway sections and patios where the budget matters more than the fastest possible cure time.
The main drawback locally is weight: mudjacking's cement slurry mix is heavier than foam, so on a spot where soil erosion is ongoing, particularly near downspouts or in low-lying yards common in parts of South City, there's a somewhat higher chance the slab will need another lift down the road compared to foam.
Polyurethane foam as a leveling method
Polyurethane foam injection uses a two-part expanding foam pumped through much smaller holes, typically about the size of a dime, and cures within roughly 15 minutes. Because it's lightweight, it puts less stress on soil that's already struggling to support the slab, and it's largely unaffected by moisture, which is relevant given how much St. Louis's spring rainfall and winter freeze-thaw cycle can saturate soil under a slab.
Foam costs more per square foot than mudjacking but often requires fewer holes and less mess, and many St. Louis contractors position it as the better long-term choice for driveways and areas with recurring drainage issues, while still recommending mudjacking for larger, lower-traffic slabs where cost matters more.
What concrete leveling costs in St. Louis
Pricing in the St. Louis metro depends heavily on which method you choose, the square footage involved, and how much lift the slab needs. Foam is priced higher per square foot but the total project cost can end up comparable to mudjacking on smaller jobs because fewer holes and less material are needed.
Get a written quote broken down by method, price per hole or per square foot, and expected lift amount, since a vague lump-sum number makes it hard to compare two contractors' bids apples to apples.
When to call a foundation specialist instead
If the uneven concrete is part of your home's structural foundation, like a porch slab poured against the house, or if you're also seeing cracks in interior walls, sticking doors, or a bowing basement wall, that's a different problem than a driveway settling and needs a structural evaluation rather than a leveling quote. Our St. Louis foundation repair cost guide covers what that kind of structural work runs and how permitting works across the metro's different jurisdictions.
Typical cost ranges
| Mudjacking, per square foot | $3 - $6 |
| Polyurethane foam, per square foot | $5 - $8 |
| Sidewalk or walkway leveling | $300 - $1,100 |
| Driveway leveling, full or partial | $700 - $2,500 |
| Patio or pool deck leveling | $600 - $2,800 |
| Slab replacement (if leveling isn't viable) | $7 - $13 per square foot |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
Which is better for St. Louis soil, mudjacking or foam?
Both work well locally; mudjacking costs less and has a long track record here, while polyurethane foam is lighter, cures faster, and tends to hold up better in spots with ongoing drainage or erosion issues. Many homeowners choose based on budget and how much lift is needed.
How long does concrete leveling last in St. Louis?
Foam leveling often lasts 10 years or more when the underlying soil issue isn't ongoing, while mudjacking commonly holds 5 to 10 years and may need a touch-up sooner on slabs affected by erosion or freeze-thaw cycling.
Can tree roots cause uneven sidewalks in St. Louis?
Yes, mature street trees in neighborhoods like Webster Groves and University City can heave sidewalk panels as roots grow beneath them, which is a different problem than settlement and may need root management before leveling holds.
Do I need a permit for concrete leveling in St. Louis?
Leveling a freestanding driveway, patio, or sidewalk generally doesn't require a permit from the City of St. Louis Building Division or St. Louis County's Division of Code Enforcement, but check with your specific municipality if the slab is tied to your home's structure.
Is concrete leveling a DIY project?
DIY foam kits exist for small cracks, but getting even lift across a larger driveway or patio slab without causing new cracks is difficult without professional equipment and experience. Most St. Louis homeowners hire a specialist for anything beyond a small patch.
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