Cracked driveway, spalling patio, or a sunken garage slab — every concrete problem eventually forces the same question: patch it or tear it out? The answer comes down to damage depth, structural integrity, and whether repair costs make financial sense long-term. Here's how to think through the concrete repair vs replacement cost decision before you call a contractor.
How Contractors Assess the Damage
Before any quote, a good contractor will evaluate a few key factors:
- Surface area affected — Is it one crack or widespread deterioration across 40% of the slab?
- Depth of damage — Surface spalling (top ¼ inch) is very different from cracks that run through the full 4-inch slab.
- Cause of the damage — Frost heave, tree roots, settling soil, or rebar corrosion each have different implications for longevity of a repair.
- Slab age and base condition — A 30-year-old slab with a compromised base may fail again quickly even after quality repair.
- Load-bearing requirements — Structural slabs under a home, commercial floor, or retaining wall have a much lower tolerance for cosmetic fixes.
Getting this assessment right is worth paying for. A $150–$300 inspection from a structural engineer can save you from a $4,000 repair that fails in two years.
When Repair Makes Sense
Concrete repair is typically the right call when damage is isolated, shallow, and the underlying base is still stable.
Good candidates for repair:
- Hairline or narrow cracks (under ⅛ inch wide) with no vertical displacement
- Surface spalling or pitting that hasn't penetrated beyond the top layer
- Single sections of a driveway or patio that have shifted slightly
- Joints that have opened up due to normal thermal expansion
Realistic repair costs:
- Crack injection or routing and sealing: $3–$8 per linear foot
- Concrete resurfacing (overlay over existing slab): $3–$10 per square foot
- Partial slab repair (cutting out and pouring a section): $300–$800 per section
- Mudjacking or slab lifting for sunken areas: $500–$1,500 per zone
Resurfacing, in particular, is a popular middle-ground option. A bonded overlay can restore appearance and function for $1,500–$4,000 on a standard two-car driveway, versus $4,500–$8,000+ for full replacement. If the base is solid and the damage is cosmetic, resurfacing typically delivers strong ROI.
When Replacement Is the Right Call
There are situations where pouring money into repairs is simply delaying the inevitable.
Replacement is usually the smarter move when:
- Cracks are structural and widespread — Multiple intersecting cracks, especially with vertical displacement (one side higher than the other), signal foundational movement.
- Rebar is exposed and corroding — Once rebar rusts and expands, it causes pop-outs and continued deterioration that resurfaces can't fix.
- More than 30–40% of the slab is compromised — At this threshold, patch costs approach replacement costs anyway.
- The base has failed — Soft, eroded, or poorly compacted subgrade will cause new problems regardless of surface work.
- You're upgrading load requirements — Adding a hot tub, heavy equipment bay, or vehicle lifts often requires a thicker slab than what's there.
Full replacement cost ranges:
- Driveway replacement: $4,500–$10,000+ for a standard two-car (400–600 sq ft), depending on thickness and finish
- Patio replacement: $6–$12 per square foot installed
- Garage slab: $5,000–$12,000 for a two-car garage depending on thickness and reinforcement
Replacement takes longer (typically 3–5 days with cure time before use) and has more upfront cost, but it resets the clock on your concrete's lifespan — usually 25–40 years with proper installation.
Repair or Replace: A Simple Decision Framework
Ask yourself these three questions:
- Is the damage structural or cosmetic? Cosmetic = repair candidate. Structural = replacement territory.
- Will repair cost more than 50% of replacement? If multiple repairs are needed, replacement often wins on long-term value.
- What caused the damage? If the root cause (soil movement, drainage, tree roots) hasn't been addressed, repair is a temporary fix regardless.
A qualified contractor should walk you through this analysis before recommending anything. Be cautious of anyone who pushes a $6,000 full replacement on a slab with two small cracks — or quotes a $200 resurfacing job on a slab that's structurally failing.
Finding the Right Contractor for the Job
Getting multiple quotes is essential here because pricing varies significantly by region, material costs, and contractor experience. Mercoly makes it easy to compare and find trusted Concrete Repair & Resurfacing providers in one place, so you're not calling five different companies just to get a baseline.
The best repairs and replacements both start with an honest assessment — get quotes from at least two to three specialists before committing to a direction.
Use this breakdown to walk into your first contractor conversation informed, and start comparing local concrete pros today.