Costs and decisions
Leveling vs replacement
The slab has settled and you have to choose between raising it and starting over.
This is the most common real fork on a settled slab, and the honest answer turns almost entirely on one question: is the concrete itself still good?
If it is, lifting solves the problem for a fraction of replacement. If it is not, lifting solves a problem you did not have.
The case for lifting
It is faster, cheaper and far less disruptive. There is no demolition, no disposal, no cure period measured in days, and the concrete you already own stays in service.
It also addresses the void, which is the actual defect. A slab that has settled has a gap under it; filling that gap restores support as well as height.
Where the concrete is sound and the cause of settlement has finished or can be fixed, lifting is usually the better decision, not merely the cheaper one.
The case for replacement
Replacement is the only option that resets the base, corrects thickness or reinforcement, changes slope or layout, and gives you concrete with a full service life ahead of it.
Where the slab is broken up, crumbling, badly spalled through its depth, or has already been lifted once and come back down, those are replacement conditions. So is a slab that was under-specified for how it is now being used.
How to tell which you have
Look at whether the slab moved as a unit. Whole and flat, sitting lower: lifting candidate. Broken into pieces, sitting at several different heights: not.
Look at the concrete's condition independently of its position. If it were at the right height, would you be happy with it? If yes, lift it. If you would still be looking at replacing it, lifting is a delay rather than a solution.
Look at whether the cause is fixable. If water is still running under the slab and nothing is changing about that, both options fail — but replacement fails more expensively.
The middle case nobody mentions
Sometimes the answer is partial: lift the panels worth lifting and replace the ones that are finished. Contractors who do both will suggest this; contractors who do one may not.
It leaves a visible difference between new and old concrete, which some homeowners mind and some do not. It is frequently the best value on a driveway where two panels have failed and eight are fine.
What to ask a contractor
- Is this slab a lifting candidate, and what specifically makes you say so?
- If we lift it, what is your realistic expectation for how long that holds?
- Would a mix of lifting and partial replacement make sense here?
- What needs to change about drainage either way?
Common questions
If I lift it now, can I still replace it later?
Yes — lifting does not prevent later replacement, and the material under the slab is removed with it. What you lose is the money spent on the lift. That is fine if the lift buys years, and poor value if it buys months.
Does lifting devalue the concrete?
The patched injection holes are visible on close inspection and that is the main cosmetic cost. Structurally, lifting does not weaken sound concrete. A slab that was going to need replacing is not made worse by having been lifted.
Work it out, or judge the quote
Related guides
Concrete leveling
Raising settled slabs back toward their original height instead of tearing them out.
Read more →Replacement and new flatwork
Removing failed concrete and pouring new — plus what separates a good pour from one that fails early.
Read more →Repair or replace?
The central question: when repair holds, when it is money spent twice, and how to tell.
Read more →What drives leveling cost
Why lifting is priced by the void rather than by the slab, and what makes two quotes differ.
Read more →Sunken concrete
A slab that now sits lower than it should — almost always a ground problem, not a concrete problem.
Read more →