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Concrete Repair

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📋 About Concrete Repair Services & Cost Guide ▾

Concrete is among the most durable building materials available, yet every slab, driveway, patio, and foundation eventually shows signs of wear — and that's where [concrete repair](https://contractorsplanet.com/?service=concrete) becomes essential. As a subcategory of the broader concrete services trade, concrete repair focuses specifically on restoring existing flatwork and structural surfaces rather than pouring new ones. Whether a driveway has developed a network of hairline fractures after a harsh freeze-thaw cycle, a garage slab has begun to sink unevenly, or a backyard patio is flaking away in sheets, repair contractors assess the underlying cause first, then match the right method to the damage profile. Skipping that diagnostic step is the most common reason repairs fail within a season or two.

Q: How do I know if my concrete needs repair or full replacement?
A useful rule of thumb is the 30–40% threshold: if more than a third of the surface area is damaged — whether through deep cracking, widespread spalling, or multiple sunken panels — replacement often delivers better value than piecemeal repair. Below that threshold, repair is almost always the more economical choice. A contractor should also assess structural integrity; if the slab is cracked through its full depth and moving independently in multiple sections, replacement is typically the stronger recommendation. Isolated damage, even when severe-looking, is nearly always repairable at a fraction of replacement cost.
Q: What causes concrete to crack in the first place?
Cracking has several root causes. Plastic shrinkage during initial curing is the most common — concrete loses moisture faster than it gains strength and pulls apart. Freeze-thaw cycling forces water in the concrete's pore structure to expand roughly 9% when it freezes, which fractures the paste matrix over time. Overloaded slabs, tree root intrusion, and subgrade settlement all create structural cracks. Thermal expansion and contraction without adequate control joints also generates predictable cracking patterns. Identifying which mechanism caused a given crack is critical because it determines whether the crack is dormant or still actively moving — a fact that directly controls which repair product will bond and hold.
Read full guide ↓
Crack repair (driveway, patio, slab)
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Concrete resurfacing
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Spalling or chipping repair
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Leveling & mudjacking
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Concrete Repair Hiring Guide

📖 Overview

The scope of concrete repair spans four primary disciplines, each handled with different materials, equipment, and labor intensity. [Crack repair (driveway, patio, slab)](https://contractorsplanet.com/?service=concrete&subcat=concrete-repair&subsubcat=crack-repair-driveway-patio-slab-lead-price-1195le) is typically the entry point — the service most homeowners need first. Technicians rout or chase the crack to a uniform width of roughly ¼ inch, vacuum out debris, and inject or trowel in a polyurethane foam, epoxy resin, or polyurea filler depending on whether the crack is structural, moving, or purely cosmetic. The American Concrete Institute's ACI 224.1R guide distinguishes between dormant and active cracks, and that classification determines which repair system will hold long-term.

[Concrete resurfacing](https://contractorsplanet.com/?service=concrete&subcat=concrete-repair&subsubcat=concrete-resurfacing-lead-price-1595) takes over when surface damage is widespread but the slab's structural integrity remains sound. Contractors apply a polymer-modified overlay — brands like Ardex, Quikrete's Re-Cap, or Brickform are industry staples — at a thickness of 1/16 inch to ¼ inch over a profiled substrate. Proper surface preparation, typically achieved with a shot-blaster or angle grinder, is non-negotiable; without a CSP (Concrete Surface Profile) of 3 to 5 as defined by ICRI Guideline 310.2R, the overlay will delaminate within months. Resurfacing can also incorporate decorative stamping or color, effectively giving an aging slab a new aesthetic for a fraction of replacement cost.

[Spalling or chipping repair](https://contractorsplanet.com/?service=concrete&subcat=concrete-repair&subsubcat=spalling-or-chipping-repair-lead-price-1495) addresses the familiar problem of surface concrete breaking away in flakes or chunks — a failure mode driven by freeze-thaw cycles, deicing salt damage, carbonation, or rebar corrosion. Repair depth matters here: shallow spalls under ¼ inch deep can be feathered with a polymer-modified topping mix, while deeper delamination requires saw-cutting a uniform repair boundary to prevent edge failure, removing all delaminated material with a chipping hammer or hydrodemolition equipment, and placing a structural repair mortar such as Sika MonoTop or MasterEmaco T 1060. If corroding rebar is exposed, the steel must be cleaned to SSPC-SP 6 Commercial Blast or equivalent and coated with a corrosion-inhibiting primer before any mortar is placed.

[Leveling and mudjacking](https://contractorsplanet.com/?service=concrete&subcat=concrete-repair&subsubcat=leveling-mudjacking-lead-price-1995) handles sunken or tilted slabs caused by soil erosion, compaction failure, or voids beneath the concrete. Traditional mudjacking pumps a cement-soil slurry through 1½-inch drill holes to hydraulically lift the slab; the newer polyurethane foam lifting (polyjacking) uses smaller ⅝-inch holes and a two-part expanding foam that sets in 15 minutes rather than 24 hours. Foam lifting adds less weight to already-compromised subgrade and is less susceptible to washout, though it costs 25–50% more per square foot than mudjacking. Either method is far cheaper than full slab replacement when the concrete itself is structurally intact.

Regionally, climate dominates the repair decision tree. In the Frost Belt — roughly USDA Hardiness Zones 3 through 6 — freeze-thaw cycling and chloride-based deicers accelerate spalling and crack propagation far faster than in Sun Belt states, where UV degradation and shrinkage cracking from high evaporation rates are the primary culprits. Coastal markets add a sulfate and chloride exposure layer that demands sulfate-resistant cements and epoxy-coated rebar in any structural patch. Local building departments in some jurisdictions (Chicago, Minneapolis, and parts of New England, for example) require permits for mudjacking or slab lifting work near foundations, so verify with your municipality before drilling.

Cost drivers include slab accessibility, damage extent, product specification, and whether subgrade work is required alongside the surface repair. Concrete repair contractors frequently coordinate with [masonry](https://contractorsplanet.com/?service=masonry) specialists when brick or stone borders are involved, and may flag related concerns to a [general contractor](https://contractorsplanet.com/?service=general-contractor) if structural implications extend to framing or foundation systems. If drainage is contributing to erosion beneath a slab, looping in a [landscaping](https://contractorsplanet.com/?service=landscaping) or [driveway](https://contractorsplanet.com/?service=driveway) contractor to regrade or install a French drain before repair work begins will dramatically extend the repair's service life. For large-scale deterioration or surfaces contaminated with oil, grease, or biological growth, pairing repairs with a [pressure washing](https://contractorsplanet.com/?service=pressure-washing) or [power washing](https://contractorsplanet.com/?service=power-washing) professional ensures the substrate is truly clean before any bonding agent is applied.

When the damage is clearly isolated — a single crack, a small spalled patch, or one sunken panel — a dedicated concrete repair contractor is usually the most cost-effective call. If more than 30–40% of a surface area is damaged, a replacement quote alongside the repair quote is worth getting; at that threshold the math often tips toward new concrete. For emergencies such as a tripping-hazard slab heave near a building entrance, most mudjacking and foam-lifting contractors can mobilize within 24 to 48 hours, and temporary grinding to eliminate trip lips is a same-day fix many concrete repair firms provide as a precursor to permanent leveling work.

✅ What it covers

  • Visual and structural assessment of the affected slab, including probing for voids beneath the surface
  • Identification of the failure cause — freeze-thaw damage, subgrade erosion, rebar corrosion, or surface scaling
  • Surface preparation via grinding, shot-blasting, or pressure washing to remove all unsound material
  • Routing or chasing cracks to a uniform geometry before filling with epoxy, polyurethane, or polyurea products
  • Application of polymer-modified repair mortars or overlays with appropriate bonding agents
  • Drilling and grouting for mudjacking, or drilling and foam injection for polyurethane slab lifting
  • Installation or re-cutting of control joints to accommodate future slab movement
  • Curing compound application or wet curing to ensure full mortar or overlay strength development
  • Final surface blending, texturing, or sealing to match adjacent concrete and improve durability
  • Coordination with related trades (masonry, drainage, general contractor) if underlying issues are identified

💵 Typical cost range

$300 to $5,000

Concrete repair costs vary widely by method and damage extent. Basic crack injection or routing on a driveway or patio typically runs $300–$800 for up to 50 linear feet. Spalling repairs average $3–$8 per square foot for shallow patches and $8–$15 per square foot for deep structural patches requiring saw-cutting and structural mortar. Concrete resurfacing with a polymer-modified overlay costs $3–$7 per square foot for plain finishes and $7–$15 per square foot when decorative stamping or color is included. Mudjacking a sunken slab averages $3–$6 per square foot, while polyurethane foam lifting runs $5–$10 per square foot — reflecting faster cure time and superior long-term performance in wet soils. Mobilization fees of $150–$400 are common for small jobs. Geographic location, subgrade access, and whether permits are required can add 10–20% in high-cost metro markets.

🛡️ Hiring tips

  • Ask for a written scope that identifies the root cause of damage, not just the symptom — contractors who skip this step tend to deliver short-lived repairs
  • Verify the contractor holds a state contractor's license for concrete or masonry work and carries at least $1 million in general liability coverage
  • Request references for the specific repair type you need — crack injection, slab lifting, and resurfacing require different expertise
  • Confirm which product brands and systems will be used; named products like Sika, BASF MasterEmaco, or Quikrete Pro Series are easier to vet than vague descriptions like "quality repair mortar"
  • Get at least two quotes for jobs over $1,000, and be cautious of estimates that skip a site visit — accurate pricing requires seeing the slab condition in person
  • Ask how surface preparation will be performed; grinding or shot-blasting is the standard for overlays, and any contractor proposing to skip it should be pressed on why
  • Inquire about warranty terms — reputable contractors typically offer one to three years on repair work, with longer coverage on full resurfacing jobs
  • Check reviews on platforms like Google and the Better Business Bureau, and ask whether the contractor has completed similar work in your climate zone

More frequently asked questions

Is mudjacking or polyurethane foam lifting better for a sunken driveway?
Both methods lift settled slabs hydraulically, but they differ in material weight, cure time, and longevity. Mudjacking uses a cement-soil slurry — inexpensive but heavy, and it can wash out if drainage is poor. Polyurethane foam expands to fill voids more completely, weighs almost nothing, cures in under 30 minutes, and is waterproof. Foam lifting costs 25–50% more per square foot but is the preferred choice in areas with high water tables, sandy soils, or where minimizing added load on weak subgrade matters. For a straightforward sunken patio slab in stable soil, mudjacking is a perfectly sound and budget-friendly option.
Can concrete resurfacing hide deep cracks permanently?
Not without proper preparation. A standard polymer-modified overlay is 1/16 to ¼ inch thick and will reflective-crack over any active joint or moving crack beneath it, usually within one to two seasons. For resurfacing to last, active cracks must be routed, filled with a flexible polyurethane or polyurea product, and allowed to cure before the overlay is applied. Some contractors install a crack-isolation membrane — a thin elastomeric layer — over dormant cracks as an added safeguard. Done correctly, a resurfaced slab can deliver ten or more years of service life and dramatically outperforms an overlay applied directly over unrepaired damage.
Do I need a permit for concrete repair work?
For most surface repairs — crack filling, patching, or resurfacing — permits are not required in the majority of U.S. jurisdictions. However, slab lifting work near a foundation, structural repairs to a load-bearing slab, or any work involving rerouting drainage may trigger a permit requirement depending on local building codes. Cities like Chicago and Minneapolis have specific requirements around work that affects grade or drainage adjacent to structures. Always check with your local building department before mudjacking near a foundation wall, and ask your contractor whether they routinely pull permits for slab lifting work in your specific municipality.
How long does a concrete repair take to cure before I can use the surface?
Cure times vary by product and method. Polyurea crack fillers reach foot-traffic strength in as little as 30–60 minutes and vehicle traffic in about an hour. Polymer-modified repair mortars typically require 24 hours before foot traffic and 48–72 hours before vehicle loads, though some rapid-set formulations (like Sika Rapid-1 or MasterEmaco T 1060 RS) allow foot traffic in two to four hours. Resurfacing overlays generally need 24 hours of protected cure time before light foot traffic and at least 72 hours before vehicles. Polyurethane foam lifting allows return to use in 15–30 minutes. Your contractor should provide written cure guidelines specific to the products they use.
Will sealing the concrete after repair help it last longer?
Yes — a penetrating sealer or film-forming sealer applied after repair significantly extends service life, particularly in freeze-thaw climates and coastal environments. Penetrating sealers based on silane or siloxane chemistry (brands like Prosoco Consolideck LS or RadonSeal) repel water and chlorides without changing the surface appearance, making them ideal for driveways and patios that see winter deicing chemicals. Film-forming acrylic sealers add a sheen and are commonly used after resurfacing. Most manufacturers recommend reapplying sealers every two to five years depending on traffic and UV exposure. Ask your repair contractor whether sealing is included or quoted as an add-on.
What should I do about spalling caused by deicing salt damage?
Salt-related spalling is a progressive failure, and the first step is to stop applying chloride-based deicers — sodium chloride and calcium chloride are both damaging to concrete surfaces. Switch to sand for traction or use magnesium chloride, which is less aggressive. For existing spall damage, all delaminated material must be removed to a sound substrate, the area cleaned thoroughly, and a polymer-modified mortar placed and cured properly. After repair, apply a silane-siloxane penetrating sealer to reduce future moisture and chloride ingress. If the spalling is widespread and the slab is otherwise structurally sound, full resurfacing with a densified or polymer-overlay system offers the most durable long-term solution.

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