Concrete Slab Crack Repair Cost: By Crack Type and Severity

Concrete slab crack repair costs depend dramatically on what caused the crack. Hairline shrinkage cracks are cosmetic and DIY-fixable for $20–$80. Active settlement cracks need professional epoxy injection at $200–$600. Structural cracks from foundation movement may signal underlying issues requiring $1,500–$8,000+ in underpinning or mudjacking. The repair starts with the right diagnosis — fixing the wrong type of crack with the wrong method wastes the money and lets the underlying problem progress.

TL;DR — 2026 ranges

Hairline shrinkage cracks (DIY): $20–$80
Static cracks up to 1/4 inch (pro): $150–$400
Active cracks (epoxy injection): $200–$600 per crack
Settled section (mudjacking / polyurethane): $500–$1,800
Foundation underpinning per pier: $1,500–$3,000 each
Whole-slab replacement: $6–$15/sqft installed
Crack monitor (for diagnosis): $5–$15 (tells you if crack is active)
Free pro inspection: Available from most foundation contractors

Diagnose the crack first

Before paying for any repair, identify what kind of crack you have. The same-looking crack can require a $30 fix or an $8,000 fix.

Hairline shrinkage cracks (cosmetic)

Width: under 1/16 inch. Pattern: thin, often parallel to control joints or in a random spider pattern. Cause: normal concrete cure shrinkage in the first 30 days after pour. Action: cosmetic fill if you want, or leave alone. $20-$80 DIY fix.

Static cracks (settled but stable)

Width: 1/16 to 1/4 inch. Pattern: usually single straight line, often near corner or joint. Cause: minor settling that has stabilized. Action: epoxy or polyurethane filler. $150-$400 pro fix; $50-$150 DIY.

Active cracks (still moving)

Width: variable, often 1/8 to 1/2 inch and growing. Pattern: single crack that's getting wider, with offset edges (one side raised). Cause: ongoing settlement, expansion-contraction, root growth, or hydraulic uplift. Action: install crack monitor for 60-90 days to confirm movement, then epoxy injection if active. $200-$600 pro injection.

Structural cracks (foundation issue)

Width: over 1/4 inch, often with significant offset (one side raised more than 1/4 inch). Pattern: diagonal across corners, stair-step in adjacent walls, or wide cracks in multiple locations. Cause: foundation failure, soil issues, hydrostatic pressure. Action: foundation inspection ($300-$600 for engineer, free from many foundation contractors). Repair: $1,500-$8,000+ depending on cause.

Repair method by crack type

Surface seal (hairline)

Clean crack with wire brush or vacuum. Apply concrete crack sealer or self-leveling polyurethane caulk. Material: $10-$30. DIY time: 30-60 minutes. Result: cosmetic, doesn't restore structural strength but blocks water.

Epoxy injection (static + active cracks)

Pros drill small holes along the crack, set injection ports, inject epoxy under pressure. Epoxy bonds the crack faces and restores ~80-95% of original concrete strength. Best for: cracks under 1/4 inch in slabs not subject to ongoing movement. Cost: $200-$600 per crack pro; DIY kits $50-$150.

Polyurethane injection (active cracks, water leaks)

Similar process to epoxy but uses expanding polyurethane foam. Better for cracks with active water flow because the foam expands to fill irregular gaps. Cost: $300-$700 per crack pro.

Mudjacking / polyurethane lifting (settled sections)

If a slab section has settled below adjacent sections (creating a step at a joint or crack), the entire section can be lifted back to grade by injecting expansion material underneath. Mudjacking uses a sand-cement slurry; polyurethane uses high-density foam. Cost: $500-$1,800 per affected area. Polyurethane is faster cure and lighter; mudjacking is cheaper.

Underpinning (structural)

If the slab is moving because the soil under part of the foundation has failed, the foundation itself must be supported by piers driven to stable bearing soil or bedrock. Cost: $1,500-$3,000 per pier installed; typical repair uses 4-12 piers. Total: $6,000-$25,000.

Full slab replacement

For old slabs with widespread cracking, severe alligator pattern, or beyond economical repair: tear out, address base, repour. Cost: $6-$15/sqft installed.

How to use a crack monitor

A crack monitor (also called a "tell-tale") is a $5-$15 plastic gauge that bridges across a crack. One side is anchored to one side of the crack with epoxy; the other side has a graduated grid. Over 60-90 days, the gauge shows whether the crack has widened, narrowed, or moved laterally.

No movement in 60 days: Crack is static. Use cosmetic or epoxy fill.
Slight movement (under 1mm) seasonally: Normal thermal/moisture cycling. Static treatment is fine.
Active widening (over 1mm in 60 days): Ongoing structural movement. Get foundation evaluation before any repair.

Crack monitors are dramatically cheaper than the cost of fixing the wrong type of crack. Install one before paying for major repair.

When to call in a structural engineer

Crack over 1/4 inch wide
Crack with visible offset (one side raised vs the other)
Multiple cracks appearing within a 12-month period
Crack accompanied by sticking doors, sloped floors, or wall cracks
Crack in a load-bearing slab (garage floor with heavy vehicle, basement slab supporting columns)

Engineer evaluation: $300-$600 for a written report. Many foundation contractors offer free inspections, but they have an interest in selling work. An independent engineer's report protects you from over-spec'd repairs.

Insurance and crack repair

Standard homeowners insurance excludes "earth movement" (settling, subsidence, expansive soil), which causes most concrete cracks. Insurance covers cracks only if caused by a sudden covered event: vehicle impact, tree fall, vandalism, plumbing leak that washed out the soil under the slab. Document the event with photos for the strongest claim.

Frequently asked questions

When should I worry about a crack in my concrete slab?

Worry when: crack is over 1/4 inch wide, has offset (one side raised), is actively widening (use a crack monitor to confirm), or is accompanied by other symptoms (sticking doors, sloped floors, wall cracks). Hairline cracks under 1/16 inch are essentially always cosmetic.

Can I fix a concrete crack myself?

Hairline cosmetic cracks: yes, $20-$80 in materials. Active or wide cracks: not recommended — proper diagnosis matters more than fix material. A pro epoxy injection on the wrong type of crack delays the real problem.

How long do epoxy crack injections last?

For static cracks in non-moving slabs: the epoxy bond outlives the surrounding concrete (decades). For active cracks in moving slabs: the epoxy will eventually crack again as the slab continues to move — you're treating the symptom, not the cause.

What causes concrete to crack?

In order of frequency: shrinkage during cure (hairline, cosmetic), thermal expansion-contraction, soil settlement under the slab, tree root pressure, hydrostatic pressure from groundwater, freeze-thaw cycles, heavy point loads beyond design capacity, foundation movement.

Will sealing a crack stop it from growing?

No. Sealing blocks water intrusion and improves appearance but does not restore structural connection across the crack. If the underlying cause continues, the crack will reopen or new cracks will appear nearby.

Should I replace my whole slab or just fix the cracks?

Single cracks in an otherwise sound slab: repair. Widespread cracking covering 30%+ of slab area: replacement is usually more economical. The threshold: if estimated repair cost exceeds 60-70% of replacement cost, replace. Get quotes for both before deciding.

Related cost guides

Pricing data compiled 2026 from CostPatch research panel across 50 US states. National ranges reflect typical professional installation/repair scope; outlier high-end work may exceed ranges. See methodology for sourcing.