Repair or replace concrete?

What each option assumes

Leveling assumes the concrete is sound and only its elevation is wrong. If that is true, it is usually the least disruptive answer. If it is not, lifting produces a damaged slab at a better height.

Localized repair assumes the problem is contained and the rest is fine. That holds when the cause was local — a trench, a downspout, a root. It does not hold when the same failure is starting in four other places.

Resurfacing assumes the structure is sound and only the surface has failed. It cannot correct movement, and it will reproduce a moving crack along the same line.

Replacement assumes the concrete itself is finished. It is the only option that lets you change thickness, reinforcement, slope or layout, and the only one that resets the base.

The three observations that decide it

First: has it moved, or has it deteriorated? Movement is a ground problem and points toward leveling or replacement. Deterioration is a concrete problem and points toward resurfacing or replacement. Both together usually means replacement.

Second: is the slab still one piece? Lifting requires a slab that moves as a unit. Concrete in several pieces cannot be lifted meaningfully and cannot be usefully resurfaced.

Third: is it still changing? A stable problem can be treated on its own terms. An active one means the cause is still running, and anything installed over it inherits the countdown.

• Moved, intact, cause fixable → leveling is worth pricing.
• Deteriorated on the surface, sound underneath, unmoved → resurfacing is worth pricing.
• Contained damage, stable, rest of the area fine → localized repair is worth pricing.
• Broken up, crumbling, widespread, or several of these at once → replacement is the realistic path.
• Still actively moving → find out why before choosing any of them.

The trap of the cheapest answer

The cheapest option is only the cheapest if it holds. Lifting a slab for a fraction of replacement is excellent value when the slab is sound and the cause has finished, and poor value when it needs replacing in two years anyway.

Conversely, replacement is not automatically the safe choice. Replacing sound concrete that has simply settled means paying for demolition, disposal and a new pour to solve a problem that lifting would have solved.

The question is not which is cheaper. It is which is true.

When to get more than one opinion

When a contractor who only does one thing recommends that thing, that is not dishonest, but it is not independent either. A leveling specialist looking at a marginal slab and a replacement contractor looking at the same slab will often reach different conclusions in good faith.

Where the job is large enough to matter, getting one quote from each discipline is worth the time. Ask each of them what would make them recommend the other approach — the answer tells you a great deal about how they think.

What to ask a contractor

• What do you think is actually causing this?
• What would make you recommend a different approach than the one you are proposing?
• If I do the cheaper option now, what is the realistic expectation before I am back here?
• Is there anything that needs fixing that is not concrete work?

Common questions