A slab that has dropped half an inch is a trip hazard, a drainage problem and, in a warehouse, a place where forklift wheels slam. It is also, in most cases, a slab that is still perfectly good concrete. Lifting it back to grade with injected material is often a fraction of the price of tearing it out, and it can be done in hours instead of weeks, which is why owners with a working floor or a busy entrance ask about it first.
The catch is that a slab only settles because the ground under it moved. Washed-out fines, a void left by a broken pipe, soil that compressed after a wet season, or clay that dried and shrank away from the concrete are all common causes, and lifting the slab without addressing the cause is a repair that repeats. So we start with questions about where the water goes and what the soil is, and we put the lift second.
We level sidewalks, dock aprons, parking lot panels, warehouse floor sections, pool decks, driveways and equipment pads across Texas, and we are honest when the answer is to remove and replace instead.
Ground that moves for different reasons in different regions
Houston is the clearest case of slow, permanent movement. Reporting that cites the Harris-Galveston Subsidence District says parts of Katy sank about 14 inches between 2007 and 2025, and that subsidence has also been measured in pockets of The Woodlands, driven by groundwater withdrawal that compacts aquifer clay. Because that compaction does not reverse, a lifted slab there may settle again over time, and we say so before the work begins.
Central Texas has its own mechanism. After heavy rain following Hurricane Sergio in October 2018, floodgates at Mansfield Dam in Austin were opened and the city issued a boil-water advisory for about a week. Flood and storm events like that wash fines out from under flatwork and open voids at edges, and the damage often appears a few weeks later as a dropped panel next to a downspout or a curb inlet.
How a slab is lifted
There are two common materials. Polyurethane foam is injected through small holes, about the size of a dime, and expands under the slab to lift it and fill voids. It is light, cures in minutes and suits floors that need to return to service quickly. Cementitious grout, the traditional mudjacking method, uses larger holes and heavier material that suits thick slabs and large voids. We choose by slab thickness, void size, the use of the floor and what the geotechnical conditions allow.
The sequence is the same either way. We map the settlement with a level, drill injection points on a planned pattern, lift in small stages while watching the slab and adjacent joints so we do not crack it, then patch the holes and clean the area. Lifting too fast or from one point is how a good slab breaks, so we raise it gradually and check often. Before we drill, we also confirm where utilities, post-tension cables and embedded conduit run, since an injection hole through a cable is an expensive mistake.
When lifting is not the answer
If the slab is cracked into pieces, delaminated or too deep to lift reliably, we recommend replacement and can coordinate the pour, from sidewalks and flatwork to full building slabs. If the real problem is soil that was not compacted properly, we may recommend over-excavation and recompaction before pouring again so the next slab does not repeat the story.
Lifting also pairs with other repairs. Many floors that have dropped also have open joints and chipped edges, which the repair and restoration crews we coordinate handle during the same visit. A floor lift on a new building that is only a few years old can be a warranty conversation with the original slab contractor, and we will document what we find so that conversation is clean. Photographs, elevation readings before and after, and notes on moisture near the settled area all go into the report we hand you.
Hours, not weeks
The speed is the main advantage. A typical foam lift reaches service strength in minutes, which means a lane, a dock apron or an entrance can reopen the same day. We coordinate with building managers to work early mornings, weekends or night shifts around operations, and we protect surrounding finishes during the injection.
Weather matters less than for new concrete, but rain does affect drilling, and very cold or very hot material needs conditioning to inject properly. We bring heated or insulated supply lines when needed and check the forecast before committing to a date. For warehouse owners with a large floor to lift in sections, we schedule section by section so racking and aisles stay open elsewhere.
What determines the price
Square footage and lift height are the starting points, but the real driver is the void and the cause. A slab with a small, shallow void is a short job. A slab over a deep washout needs a large volume of material and may need two passes. Access for the drilling and injection equipment, the number of mobilizations and the need to restore the surface afterward also affect cost.
The owner should compare the lift price with replacement, including demolition, base preparation, formwork, the pour, curing and downtime. For a driveway or sidewalk, that comparison often favors lifting by a wide margin. For a large industrial floor in a self-storage facility or a warehouse, the saving can be even larger because replacement means emptying the building.
Get your slab back to grade
Send photos of the dropped area, tell us how the floor or walk is used and when it must reopen. We will visit, find the likely cause and quote a lift or a replacement, whichever is the better value.
Common Questions
Will the slab settle again after you lift it?
It might, if the soil is still moving. Lifting fixes the symptom and, with foam, fills the void, but it does not stop groundwater compaction or clay shrinkage. We look for the cause, recommend drainage or soil fixes when they apply, and tell you honestly when a slab in a subsiding area may need another lift later.
How big a drop can you correct?
Most jobs are inches, not feet. We have lifted slabs that dropped several inches, but very large drops, slabs that have tilted past usable limits or panels broken into pieces are better replaced. We will measure and say so before quoting.
Can you lift a slab that carries loads such as racking or equipment?
Yes, with planning. We coordinate with the owner to move or support equipment, lift in small increments and monitor settlement of nearby columns. A floor under racking is lifted in sections so the load never goes uneven.
Is it safe for the soil and the plants around it?
Foam products used for slab lifting are inert once cured and are widely used under flatwork. We keep injection holes small and avoid runoff, and we follow the manufacturer data sheets for each product.
Do homebuilders and developers use this service?
Often. Homebuilders and multifamily developers call us to correct settled flatwork around completed buildings before turnover, which is much faster than ripping out and re-pouring a sidewalk.