Concrete Lifting vs. Concrete Replacement
When raising a sunken slab is proportionate, and when the slab itself needs to go.
The concrete lifting cost factors behind a sunken slab estimate
Concrete lifting cost is driven less by the size of the visible dip and more by what is actually happening underneath the slab — how much void space needs filling, which method fits the situation, and whether the slab is even a good candidate to lift. This page covers those factors directly, without stating a number.
Describe your sunken slabWhy the size of the dip is a poor guide to the price
A driveway or patio slab that has visibly sunk an inch looks like a straightforward job to price from the surface, but concrete lifting cost is set mostly by what a contractor finds underneath, not by how far the top of the slab has dropped. A small visible dip over a large void needs more material and more careful, incremental lifting than a larger-looking dip over a shallow, contained void. The method matters just as much as the void: foam lifting, mudjacking, and full replacement use different equipment and materials, and which one applies depends on the slab's own condition as much as on what is under it. A slab too cracked or deteriorated to lift safely moves the job into a different category entirely, regardless of the void beneath it.
What actually moves a concrete lifting estimate
Size of the void underneath the slab
A larger void needs more material to fill before the slab is actually supported — independent of how far the visible surface needs to rise.
Which lifting method fits the slab
Polyurethane foam, cement-based mudjacking, and full replacement differ in material, equipment, and cure time, and the right one follows from the slab's condition and the void size, not preference.
Number of separate slab sections affected
A single driveway apron is a different scope than a driveway plus a patio plus a walkway lifted in the same visit.
Whether the underlying water source is also being addressed
Fixing the drainage or grading issue that caused the settlement is a real, separate line of work from lifting the slab itself.
Access for equipment
A driveway with clear equipment access prices differently than a rear patio slab reachable only through a narrow side yard.
Questions people ask
Is polyjacking cheaper than mudjacking?
Not reliably — the two use different materials for different situations, and which one is appropriate for a given slab depends on the void size and the slab's condition, not a fixed price relationship between the methods.
Does a bigger visible dip always mean a bigger bill?
Not necessarily. A small dip over a large hidden void can require more material and more careful lifting than a larger-looking dip over a shallow void — the void size, not the visible drop, is closer to what actually sets the scope.
Can any sunken slab be lifted, or does it sometimes need replacing?
A badly cracked or deteriorated slab may not be a good candidate for lifting and is instead a replacement job — that assessment happens on site by checking the slab's own structural condition, not from a description alone.
Will the slab sink again after it is lifted?
It can, if the underlying cause — usually water movement or eroded soil under the slab — is not addressed. Lifting without fixing the source is a repair that is more likely to need revisiting.
Describe your sunken slab
Which slab is affected, roughly how far it has settled, and whether there is a visible water source nearby.
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