When a driveway panel drops beside the garage, compare what the repair will accomplish before comparing the square-foot price. Find out why it moved, whether the concrete can tolerate lifting and where water will drain at the finished grade. Grout or polyurethane may raise a suitable panel; replacement gives the contractor access to rebuild its support. Put those scopes alongside each other so the cheaper quote addresses the same problem.
Diagnose the settlement before pricing the repair
Map the low area and every joint around it. Look for cracks that cross the panel, loose or rocking sections, spalled edges, water pooling, and runoff coming from a roof or neighboring slope. Photograph the driveway after rain and mark where it meets the garage floor, sidewalk and adjacent panels. Those observations help a contractor assess the entire path of water and the amount of elevation change needed.
Use the puddles, hollow sounds and panel age as clues for the assessment, without treating any one as a complete diagnosis. A low spot does not reveal why the ground moved, and tapping cannot measure the void. The American Concrete Institute’s slabjacking guide[1] lists settlement, erosion, flooding and shrinking soil or base among possible causes. Determine the underlying conditions first, since leveling alone will not correct poor soil.
Water may be part of the problem, but the fix depends on where it originates. A downspout that ends beside the driveway is a different job from a poorly graded surface or a failed drain. If roof water is overflowing a loose gutter, start with our sagging-gutter diagnosis. Ask the contractor to identify the observed water path and describe any drainage work in the written scope. Moving the concrete while continuing to feed water toward its edge may leave the original mechanism in place. The Federal Highway Administration warns in its concrete pavement preservation guide[2] that distress can return when the cause of settlement or lost support is not addressed.
One low panel does not prove the whole driveway needs replacement. Conversely, an intact-looking top does not prove the support beneath is sound. If several panels are moving, the garage connection is cracking, or the driveway appears to be draining into the building, request a broader assessment before choosing an injection-only scope.
What a lifting quote actually buys
Treat lifting and panel replacement as professional work. For lifting, the deciding skill is controlling injection pressure and elevation while checking support; replacement adds base preparation, grade setting and curing. Homeowner preparation is mainly documenting movement and drainage, then comparing those complete scopes.
Slabjacking is an injection repair. A contractor drills holes and pumps material beneath the existing slab to raise it gradually. The FHWA describes cement grout and polyurethane as options. Its technical guide distinguishes lifting a depressed slab from stabilizing a slab by filling a void. That distinction matters when reading an estimate: “void fill” does not necessarily promise a level driveway.
Lifting is most plausible when settlement is local and the slab remains sufficiently intact to move as a panel. FHWA describes generally uncracked, locally settled pavement as an ideal candidate. ACI also says replacement should be evaluated according to cracking, distress and the prospect of further movement. These are road and concrete-repair guides, not a universal residential pass/fail test. Let the contractor explain the actual cracks, support and boundaries of your panel rather than applying an invented crack-width or age cutoff. A pedestrian path calls for a different assessment; see our sinking-walkway guide.
Cement-grout lifting
Grout lifting pumps a flowable cement mixture beneath the slab. The hole pattern, mixture and sequence depend on the panel and the lift. ACI's field guide describes monitoring pressure and the height of the concrete during pumping. That control is what you should ask about, especially beside a garage threshold where raising one edge too far can create a new problem.
Ask where holes will be drilled and how they will be finished. ACI notes that repaired grout holes can remain visible, even when filled flush. Ask whether the proposal includes filling remaining voids after the target height is reached. A contractor may need a separate pass to restore support rather than leaving parts of the panel on isolated points of grout.
Get the material, injection-hole finish and return-to-use instructions in the grout quote. On a small residential job, access, material volume, crew mobilization and drainage work can outweigh a simple material-price comparison. Use those specifics to evaluate the total and schedule rather than assuming grout is always cheaper or ready for traffic after a fixed number of hours.
Polyurethane lifting
Polyurethane uses an expanding injected material. ACI describes foam grouts as usually mixed during injection, with smaller typical holes than cementitious grout. It also notes that application can proceed faster, but that does not establish a universal time when your car may return. Product instructions, temperature, slab condition and the installer’s acceptance check determine that schedule.
Ask to see how smaller foam-injection holes would be patched on concrete similar in age and color to yours. They may be less conspicuous, though the repair can remain visible. Then ask how the contractor controls lift near joints and checks the support afterward. ACI cautions that foam’s quick reaction can leave part of the cavity unfilled, so reaching the target height and filling the support voids need separate checks.
Include drainage and ground movement in the assessment even when the proposed foam resists water. The surrounding soil can still move or wash away. If the installer cites density or compressive strength, ask for the exact system and an explanation of its relevance to your panel and vehicle loads. Those figures alone cannot establish adequate support over a deficient base.
When replacement deserves serious consideration
Replacement exposes the ground beneath the old panel so the contractor can remove unsuitable material, prepare a base and establish a new grade and drainage. Allow for demolition, disposal, pouring and curing in the comparison, as well as a possible visible difference from adjacent concrete. Those added steps may be necessary for the site, but they do not establish a fixed lifespan for the result.
Ask for a replacement option when the slab is badly cracked, crumbling, repeatedly moving or too distorted to lift to a usable grade. ACI’s slabjacking guide recommends evaluating replacement according to the amount of cracking and distress and the prospect of further movement. Ask the contractor to compare the cost and feasibility of retaining the panel with removal and a new base. The inspection should establish whether removing one panel, several panels or only a damaged portion can preserve sound adjacent work and joints.
Replacement is only a more complete repair if the quote addresses the conditions that caused settlement. Ask what the crew expects to find after removal, how extra excavation would be priced, what base preparation and drainage work are included, and who approves a change in scope. The crew cannot know every buried condition before demolition; the written plan should say how surprises will be handled.
New concrete also needs curing, which means managing moisture and temperature while it gains strength. The ACI explanation of curing[3] describes that process. Ask the placing contractor for the actual protection plan and written timing for foot traffic, passenger vehicles and heavy deliveries. A universal “seven days for every driveway” rule does not account for the mix, weather or design. Keep vehicles off until the responsible contractor releases the slab for that use.
Compare complete local quotes
Published national price ranges cannot quote your driveway. One slab beside a garage can require difficult access, a new drain or more base work than several easy panels. Compare written proposals line by line, including what is excluded. A low injection price paired with a separate drainage job can cost more than a complete proposal that includes the water correction.
| Scope question | Lifting proposal | Replacement proposal |
|---|---|---|
| Cause | What evidence supports lifting, and how is the cause addressed? | What will be checked beneath the removed slab? |
| Finished grade | What height will the slab meet at each joint and doorway? | What slope, joints and transitions will the new panel have? |
| Support | How will voids and remaining unsupported areas be checked? | What base preparation is included? |
| Water | Which drain, downspout or grading correction is included? | How will the new surface route runoff? |
| Finish | Where will injection holes be patched? | How will the new surface differ from adjacent concrete? |
| Use and remedy | When may each type of vehicle return, and what happens if the lift falls short? | What curing and access rules apply, and how are hidden conditions priced? |
Ask each bidder to separate the core repair from drainage, additional base work and optional cosmetic work. If the contractor cannot reach the planned elevation without risking cracks, the lift quote should say what the stopping point and next choice will be. If a replacement quote assumes a sound base without inspection, it should explain how the price changes if that assumption proves false.
Read the warranty for the defect covered, how a new drop is measured, drainage and soil exclusions, and the charge for a return visit. Keep it with the estimate, product details, photographs and completion notes. Use that record to compare a later defect with the covered condition and the work that was actually completed.
Make the choice for this driveway
Choose a lifting proposal when the contractor can explain why the existing concrete will tolerate it, how the lift and support will be controlled, and how the settlement cause will be corrected or monitored. Compare grout and polyurethane on that complete scope, site access, finish and written use instructions. Neither wins every job on cost or durability.
Choose replacement when the panel is too damaged to retain, its base must be rebuilt, or a lift cannot produce a safe, well-drained transition. Do not use a fixed age, number of cracks or advertised lifespan as the deciding threshold. The practical test is whether the proposed work leaves sound support, workable drainage and a usable driveway at the connections. Once the job is done, inspect those connections and the water route before treating the repair as complete.
