Look under the uneven surface.
Nonstructural concrete can settle when its support changes. Water erosion, poorly supported fill, tree-related conditions or adjacent work can contribute. Before lifting a slab, an assessment should consider why it moved, the condition of the concrete and where water will flow afterward.
Common reasons to request an assessment
- A raised edge between adjoining sidewalk or patio panels.
- Steps or small slabs that have separated from nearby concrete.
- Water pooling because a slab no longer drains as intended.
- Visible voids, washout or repeated settlement beside the surface.
Keep people away from significant trip edges where practical. Do not attempt to lift slabs with improvised equipment, and do not fill a void without understanding utilities, drainage and the support condition.
Lifting versus replacement
Some sound slabs may be lifted using a suitable material placed through small access holes. Other slabs are too fractured, deteriorated or poorly configured for lifting to be useful. Replacement may be the more appropriate option when the surface itself has failed or drainage requires a different layout.
The proposed method should explain expected elevation changes, hole locations, surface patching, limitations and how adjoining structures will be protected. Ask about underlying utility locations, access needs, cleanup and when the specific material can be returned to use. No universal timing applies to every system.
Level is not always the goal.
Outdoor concrete often needs a deliberate slope to shed water. A useful plan considers the destination of runoff and the relationship to the house, thresholds and neighboring panels. A perfectly flat slab that directs water toward the foundation is not a good outcome.
Know when the issue is structural
A driveway or walkway assessment is different from evaluating the slab supporting a home. Cracks accompanied by wall movement, sticking doors or a changing interior floor need a foundation assessment. Review slab foundation repair if load-bearing support may be involved.
Confirm property ownership and any local requirements before altering sidewalks, driveway aprons or public access areas. The City of Charleston permit resources include right-of-way and related review links; not every concrete surface is solely a private-property decision.
Questions about this service
Can every settled slab be lifted?
No. The concrete condition, cause of settlement, access and required drainage all affect suitability. A proposal should explain why lifting or replacement is recommended.
Does lifting prevent future settlement?
It does not automatically resolve erosion, leaks or other changing support conditions. Ask how the cause will be addressed and what limitations remain.