Recognizing settlement
Look for a noticeable lip at the garage entrance, a panel sitting below the adjoining concrete, water lingering in a low area or a joint that has widened. Photograph the area after rain as well as when dry; the water pattern can help explain the practical problem.
How a contractor evaluates the slab
The assessment should consider slab cracking, thickness where known, nearby structures, drainage, access for equipment and evidence of voids or weak support. A slab with extensive breakage may not lift predictably.
What lifting is intended to do
Depending on the method and conditions, material is introduced beneath the existing slab to improve support and raise it toward the desired elevation. The contractor should explain how joints, the garage threshold and runoff will look after the work.
When replacement deserves consideration
If the driveway is badly deteriorated, broken into unstable pieces or needs a substantially different layout, lifting may not meet the goal. Replacement can also be relevant where the base or drainage needs major reconstruction.
Questions for the estimate
Ask which panels are included, whether cracks or joints are repaired separately, how the finished slope will be checked and whether there are limitations on achievable lift. Confirm whether the contractor offers the proposed method before assuming a particular material will be used.