Repair a Settling Concrete Porch
A sinking porch can affect both the safety and appearance of your home’s entrance. When porch slabs settle or shift, they can create uneven steps, trip hazards near the doorway, and gaps between the porch and the structure. Over time, these issues can worsen if the soil beneath the slab continues to move.
STL Polyjack provides porch leveling in St. Louis, MO using advanced polyurethane foam injection. Our process lifts and stabilizes sinking concrete from underneath—no demolition or replacement—often saving customers up to 50%
Most porch leveling projects can be completed in just a few hours, and the surface is typically ready to use the same day.
Why Porches Sink
Porch slabs rely on stable soil beneath the concrete for support. When that soil shifts, erodes, or settles, the concrete porch can begin to sink or tilt away from the home.
Common causes include:
- Soil erosion caused by rainwater or poor drainage
- Voids forming beneath the slab
- Weak soil beneath the porch foundation
- Poor compaction during construction
- Seasonal soil movement and settling
When these conditions occur, the porch slab loses support and begins to drop. Concrete leveling restores that support by filling the voids and stabilizing the soil underneath.
Signs Your Porch Needs Leveling
Porch settlement often develops slowly, which means homeowners may not notice the issue until the problem becomes more obvious.
You may need porch leveling if you notice:
- The porch slab sitting lower than the doorway
- Gaps forming between the porch and the house
- Uneven or tilted surfaces near the entrance
- Cracks forming across the porch slab
- Water collecting near the porch area
- Steps becoming uneven or misaligned
These problems can continue to worsen if the empty space beneath the slab grows larger over time.
Sometimes porch settlement happens along with other concrete issues around the home. If you are noticing uneven concrete in several areas, Saint Louis Polyjack also provides driveway leveling, walkway and sidewalk leveling, and patio leveling. The same lifting process can also repair garage floor leveling and pool deck leveling when settlement occurs in other areas of the property.
Free Concrete Leveling Estimate
Customers can also send photos of the problem area for a faster quote.
Why Property Owners Choose Saint Louis Polyjack
Serving St. Louis, Sunset Hills, Fenton, Kirkwood, Ballwin, Chesterfield, and surrounding communities.
Our Fix: Polyurethane Porch Leveling
Saint Louis Polyjack uses a polyurethane foam injection process to lift and stabilize porch slabs safely and efficiently. Instead of tearing out the porch and pouring new concrete, our method restores support beneath the slab by filling hidden voids and strengthening the soil underneath.
Our process works in three simple steps:
1. Drill Small Access Holes
Small holes are drilled in specific areas of the slab so we can reach the empty space beneath the concrete.
2. Inject Expanding Polyurethane Foam
High-density foam is injected beneath the porch. The material expands to fill voids, stabilize the soil, and gently lift the slab back into position.
3. Patch the Holes and Finish the Repair
Once the porch is level, the drill holes are patched neatly. Most porch surfaces are ready to use shortly after the repair is completed.
Benefits of Porch Leveling
Concrete lifting offers several advantages compared to replacing a porch slab.
Some of the main benefits include:
- Save up to 50% compared to replacement
- Fast repair that usually takes only a few hours
- Minimal disruption to the home and landscaping
- Long-lasting stabilization beneath the slab
- Improved drainage and reduced water pooling
- Removal of uneven surfaces and trip hazards
Instead of replacing the porch, leveling restores the existing concrete while correcting the problem underneath.
Why Choose STL Polyjack
When concrete starts to sink or settle, choosing the right contractor matters. STL Polyjack brings over a decade of experience and more than 1,200 completed lifts across the St. Louis area. We focus on fixing the root cause—not just the surface—using advanced polyurethane foam injection to lift and stabilize concrete without the cost and disruption of replacement. When you work with our team, you can expect:
- Over a decade of hands-on experience
- 1,200+ concrete lifting projects completed locally
- Polyurethane foam designed for long-term support
- Minimal disruption to your home or business
- Completed in hours, not days, with same-day use
- Honest evaluations and straightforward recommendations
- Repairs backed by a 5-year warranty
Whether the project involves a residential driveway, uneven sidewalk, patio, commercial slab, or structural repair, our goal is to deliver a repair that restores safety, stability, and confidence in your concrete surfaces.
FAQs – Porch Leveling
Helpful answers about leveling sunken porches and repairing uneven concrete entrances.
Yes. If the concrete porch slab is structurally sound, polyurethane lifting can raise and stabilize the slab without demolition. You can learn more about the process on our concrete leveling process page.
Most porch leveling repairs are completed in just a few hours, making it a faster option compared to replacing the concrete.
Porches are typically ready to walk on the same day after the repair is completed because the polyurethane foam cures quickly and provides strong support.
Porch slabs usually settle because of soil erosion, poor drainage, or voids forming beneath the concrete. In some cases, filling these empty spaces with void filling helps restore proper support.
Many homeowners choose polyurethane lifting because it uses smaller drill holes and lightweight material that stabilizes the soil beneath the slab. You can learn more about the differences on our poly leveling vs mudjacking page.
Yes. The same lifting process can repair driveways, sidewalks and walkways, patios, and garage floors if settlement occurs in multiple areas.
Trusted by Leading Businesses
Areas We Serve
STL Polyjack proudly serves homeowners, businesses, and property managers across the St. Charles and St. Louis area. With over a decade of experience, we provide polyurethane concrete leveling, lifting, and structural repair solutions that restore sinking concrete without the cost of replacement. From driveways and sidewalks to warehouse floors and parking lots, we keep properties safe, level, and stable.
Serving St. Louis & Surrounding Communities
- St. Charles, MO
- St. Louis, MO
- Sunset Hills, MO
- Fenton, MO
- Kirkwood, MO
- Webster Groves, MO
- Ballwin, MO
- Chesterfield, MO
- Crestwood, MO
- Arnold, MO
- Manchester, MO
- Des Peres, MO
- Ellisville, MO
- Town and Country, MO
- Oakville, MO
- Affton, MO
- Clayton, MO
- Maryland Heights, MO
- Bridgeton, MO
- Florissant, MO
- University City, MO
If you have sinking or uneven concrete around your property, we can evaluate the issue and recommend the best solution.
We offer free estimates, and you can even send photos for a fast quote.
About Saint Louis Polyjack
Saint Louis Polyjack specializes in polyurethane concrete leveling, lifting, and structural repair throughout St. Louis, MO and surrounding communities. We raise and stabilize sinking driveways, sidewalks, patios, pool decks, warehouse floors, and more using advanced poly foam technology.
Our process is fast, clean, and long-lasting — backed by a 5-year warranty.
Office Location : 12951 Gravois Rd. Ste. 100 St. Louis, MO 63127
Uneven Concrete? Don’t Replace It — Lift It.
Get a Free Estimate Today.
✉️ stlpolyjack@stlpolyjack.com
Serving St. Charles, St. Louis, Sunset Hills, Fenton, Kirkwood, Webster Groves, Ballwin, Chesterfield, Crestwood & Arnold.
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