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Concrete Repair Melbourne

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Raise & Relevel repairs damaged concrete across Melbourne: cracked and sunken driveways, crumbling garage floors, spalling balconies, car park slabs, worn stairs, and industrial floors. Most concrete can be repaired rather than replaced, and where the problem is the ground underneath rather than the concrete itself, we can lift the slab back to level.

Every repair is backed by our 100-year product guarantee and 50-year workmanship guarantee. We are fully licensed and insured, and the on-site assessment is free.

Concrete fails in a handful of recognisable ways, and the right fix depends on which one you are looking at. This page covers the damage we repair, how spalling and concrete cancer are treated, when to repair rather than resurface or replace, and what the work costs.

What we repair

Driveways: cracked, sunken or scaling driveway concrete, one of the most common calls we get across Melbourne. Garage floors: cracking, pitting, or uneven surfaces from vehicle weight and moisture over time. Paths and footpaths: trip hazards from lifted or cracked sections, repaired without a full replacement in most cases. Stairs and steps: worn nosings, cracked treads and spalling on concrete stairs, both internal and external.

Balconies: spalling and concrete cancer repair to balcony slabs and soffits. Car park slabs: structural and cosmetic repairs to car park decks and soffits for body corporate and commercial clients. Warehouse and factory floors: industrial slab repair for cracking, joint failure and surface wear under heavy traffic. Pool surrounds: concrete repair around pool areas, where moisture exposure often accelerates damage.

Concrete spalling and concrete cancer repair

Spalling is the flaking, chipping, or breaking away of concrete from the surface, usually exposing the steel reinforcement underneath. Concrete cancer is what happens next: moisture reaches that exposed steel, the steel rusts, and rust takes up more space than steel, so the expansion pushes the surrounding concrete off from the inside. The two terms are often used to describe the same underlying problem, and the process behind both is chemical, not just wear and tear.

Concrete is naturally alkaline, and that alkalinity protects the steel inside it from corroding. Over time, carbon dioxide in the air reacts with the concrete surface in a process called carbonation, gradually reducing that alkalinity. Once carbonation reaches the depth of the steel, the protection is gone, and any moisture that reaches the bar can start the rusting process. This is why older concrete, and concrete built with shallow cover over the reinforcement, is more exposed than newer or better-covered work.

The warning signs are rust staining bleeding through the surface, bubbling or flaking render, hollow-sounding patches when tapped, cracks running in straight lines that follow the reinforcement pattern, concrete falling away from a soffit or balcony edge, and a reddish-brown discolouration spreading outward from a crack or joint.

In Melbourne, we see it most on apartment balconies, car park soffits, coastal and bayside properties, and older concrete built with shallow cover. Balconies and soffits are exposed to weather from more than one side and often carry less cover than a ground slab. Bayside suburbs add airborne salt, which accelerates corrosion once moisture reaches the steel. Older apartment blocks built before current cover and durability requirements are especially common candidates, which is why body corporates managing pre-1990s buildings often find spalling repair a recurring maintenance item.

Once moisture reaches the steel, the corrosion does not stop on its own. Rust occupies several times the volume of the steel it replaces, so the expansion keeps growing the crack and loosening more concrete around it. On balconies and car park soffits, that concrete is directly over a walkway or parking space, which is why we treat it as urgent rather than cosmetic.

The repair removes the affected concrete back to sound material well beyond the visible damage, since carbonation can extend deeper than it appears at the surface. The exposed steel is cleaned and treated to prevent further corrosion; the area is reinstated with a repair mortar suitable for structural or cosmetic use, and a protective coating is applied to help prevent the same section from failing again. Getting this sequence right on every affected area, rather than patching over the visible hole, is the difference between a repair that lasts and one that fails again within a year or two.

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The damage we repair

Not every crack or flake means the same thing. Here is what each type of damage usually indicates and how we treat it.

Cracking

A shrinkage crack forms as new concrete cures and is usually cosmetic. A structural crack is wider, often follows a straight line, and can signal a problem with the slab’s support rather than the concrete itself. Most cracks are treated with Melbourne crack injection, which fills and bonds the crack rather than just covering it over.

Spalling and surface flaking

Concrete flaking, chipping or breaking away from the surface, often exposing the steel underneath. This is common enough in Melbourne that it is covered in its own section above, and it is the type of damage that worsens on a predictable timeline if left alone.

Sunken and uneven slabs

When the ground beneath a slab has settled rather than the concrete itself failing, that is usually a job for Melbourne slab jacking, not concrete repair. If your driveway or garage floor has sunk rather than cracked, it is worth checking that page first. Where the movement affects the building’s foundations rather than a standalone slab, Melbourne underpinning or a broader look at Melbourne house subsidence may be the more relevant starting point.

Pitting, scaling and failed expansion joints

Small pockmarks or a scaling, crumbling surface on driveways and paths, usually caused by weather exposure or poor original finishing. Left alone, pitted concrete worsens gradually as water collects in the pockmarks and erodes the surrounding material a little further each season. Expansion joints break down the same way: once a joint has failed, water gets in, and the two adjoining sections can move independently, which often shows up as one edge sitting slightly higher than the other.

Rust staining

Rust marks bleeding through the surface are often the first visible sign that the steel reinforcement underneath is corroding. Catching this stage early, before the concrete around it visibly breaks away, generally means a smaller and less costly repair.

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Repair, resurface or replace?

Repair, concrete resurfacing and full replacement solve different problems, and the right choice depends on whether the damage is localised, cosmetic, or structural. All three fall under the broader banner of concrete restorations, but choosing the wrong one wastes money either way.

Repair is the answer when the damage is localised, and the slab is otherwise sound. It is usually done in a day or less; the patch may be visible against the surrounding concrete, and its lifespan depends on correct diagnosis and installation. Extensive crack or spalling repairs start from approximately $2,500.

Resurfacing suits concrete that is worn or stained but structurally fine. It gives a uniform new surface across the whole area, typically takes one to a few days depending on size, and is priced per project once the scope is confirmed on site. Its lifespan depends on the surface preparation and product used.

Replacement is for a slab that has failed structurally. It costs more than repair, takes days plus curing time, gives the longest lifespan, and the new concrete will not match adjoining areas.

If the actual problem is the ground underneath rather than the slab itself, none of these three is the right starting point. Slab jacking addresses that separately, and it is worth ruling it out before committing to repair, resurfacing or replacement. Our concrete levelling guide has more on how that decision gets made.

How we repair concrete

The right repair method depends on the type and extent of damage, not on a single default technique. Epoxy crack injection fills and bonds structural cracks. Polyurethane injection is used for cracks with ongoing water ingress. Concrete stitching restores tensile strength across wider structural cracks. Patch repair with a repair mortar handles localised spalling and surface damage. Protective coatings are applied after structural repair to help prevent recurrence, and resurfacing is used for concrete that is worn or cosmetically damaged but structurally sound.

Which method applies depends on an on-site assessment of the crack’s width, depth, cause, and location, not on a generic price list. Our Melbourne crack injection page provides more detail on the injection methods.

Concrete repair pricing depends on several factors, and no two jobs are priced exactly the same. As a general guide, extensive crack or spalling repairs commonly start from around $2,500, based on Raise & Relevel’s published crack injection pricing, and scale up from there.

What moves the price

  • Type of damage. A cosmetic crack costs less than structural spalling or concrete cancer, which involve removing damaged concrete, treating exposed steel, and properly reinstating the area.
  • Size of the affected area. A small patch costs less than a full balcony soffit or an extensive network of driveway cracks.
  • Whether reinforcement steel is exposed. Treating corroded steel adds time and materials, and it is the step that separates a lasting concrete cancer repair from one that fails again within a year or two.
  • Access and height. A balcony soffit or car park ceiling needs different access equipment than a ground-level driveway.
  • Whether a protective coating is required. A further step after structural repair, but one that helps prevent the same section failing again.
  • Residential versus commercial. Body corporate and commercial jobs often involve larger areas, stricter access requirements, additional compliance considerations, and scheduling around business hours or resident access.

The only way to get an accurate figure for your property is a free, on-site assessment. We confirm the scope and cost before any work begins.

How Raise & Relevel repairs concrete

From the first call to the completed repair, the process is designed to give you certainty at every stage rather than surprises once work is underway.

  • Free on-site assessment to inspect the damage and confirm the cause
  • A customised repair plan, naming the method and materials for your specific damage
  • Scheduled repair work, carried out to minimise disruption to your property
  • Post-repair inspection to confirm the work meets our standard
  • Warranty documentation covering the completed work

We repair concrete across greater Melbourne, from the CBD and inner suburbs through to the bayside, eastern, northern and western regions: Frankston, Carrum, Chelsea, Mordialloc, Mentone, Cheltenham, Brighton, Dandenong and the Mornington Peninsula in the south east; Richmond, Hawthorn, Camberwell, Box Hill, Doncaster and Ringwood in the inner east; Brunswick, Preston, Reservoir, Bundoora and Eltham in the north; and Footscray, Sunshine, Werribee, Point Cook and Melton in the west. See our Melbourne hub for the full range of services we offer across the city.

Cracked, spalling or sinking concrete does not get better on its own. Book a free on-site assessment, and we will confirm the cause, the right repair method, and the cost before any work begins, or call us on 1300 053 835 to talk to the team directly.

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Why Raise + Relevel?

Better.

Better quality workmanship for a better price – R+R delivers value to our customers by offering the highest quality services at the most competitve price.

Experience.

Over 100 years of genuine experience in relevelling structures – we are ground surgeons.

Guaranteed.

We stand behind the quality of our products and workmanship. Our warranty provides 100-year warranty on our resin products and 50-year warranty on our workmanship – If the problem returns, we return.

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FAQ

Your home is everything to you and your family, so before going ahead with any subsidence repairs, we’ve put together a list of questions our customers should ask:

Cost depends on the type of damage, the size of the area, whether reinforcement is exposed, and site access. As a general guide, extensive crack or spalling repairs typically start at around $2,500, according to Raise & Relevel’s published crack injection pricing. The only reliable way to get an accurate figure is a free on-site assessment, since two jobs that look similar can have very different scopes once the concrete is opened up.

Concrete cancer starts when moisture reaches the steel reinforcement inside a slab or structure. The steel rusts, and rust occupies more volume than steel, so the expansion pushes the surrounding concrete outward from the inside. Left untreated, the damaged area grows over time, which is why early repair matters more than it might appear from the surface, particularly on balconies and car park soffits where the affected concrete sits above a walkway or parking space.

Spalling is usually caused by moisture penetrating the concrete, carbonation of the surface over time, shallow concrete cover over the reinforcement, and salt exposure in coastal areas. Weather cycles common to colder overseas climates are not a significant factor in Melbourne, contrary to what you may have read on other concrete repair sites.

Yes, when the affected concrete is removed back to sound material, the exposed steel is properly treated, and the area is reinstated with the correct repair mortar and protective coating. Simply patching over the visible damage without addressing the corroded steel underneath is why concrete cancer repairs sometimes fail. The problem returns because the actual cause was never treated, only the symptom.

It depends on whether the damage is localised and the slab is otherwise structurally sound, or whether the concrete has failed more broadly. See the repair, resurface or replace comparison above for how we assess this. In most cases, a free on-site assessment is the only reliable way to know which applies to your specific slab.

Many straightforward repairs, such as a driveway crack or a small patch, are completed within a day. Larger or structural jobs, including balcony or car park spalling repairs, can take several days depending on the extent of damage and whether protective coatings need time to cure. Your assessment will confirm a realistic timeframe for your specific job.

Patch repairs may be visible against surrounding concrete, since matching the exact colour, texture and age of existing concrete is genuinely difficult. Where appearance matters more than a visible patch is acceptable, concrete resurfacing usually gives a more uniform result across the whole surface. We will be upfront about which option suits your situation before you commit to either.

Yes. Alongside residential driveways, paths and garage floors, we repair balcony and car park slabs for body corporate and commercial clients, including the structural and cosmetic spalling repairs covered above.

Not usually. A sunken driveway where the concrete itself is still intact is typically a sign that the ground underneath has settled, which is a job for slab jacking rather than concrete repair. See our Melbourne slab jacking page for more on that specific problem, since lifting a slab and repairing damaged concrete are two different repairs solving two different problems.

We work across Melbourne, including the CBD, inner suburbs, bayside, eastern, western and northern regions. Get in touch to confirm coverage for your specific address.

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