What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
Cracked or heaving concrete steps and driveways are the visible result of what is happening underneath them: freeze-thaw cycles working on water in and under the slab, or soil settling, washing out, or heaving unevenly beneath it. Concrete is strong but brittle, so it cracks rather than bends when one section moves and another does not. A thin surface crack that has looked the same for five years is a cosmetic fact of Canadian concrete, while a slab that has lifted at one edge, a step that has tilted, or a crack that offsets into a lip is a trip hazard first and a repair question second, and should be read that way.
Judge urgency by feet, not by looks. A badly heaved or tilted section is a trip hazard today: mark or rope off the worst section to prevent a fall until it is repaired, especially on steps and on the route visitors and delivery drivers take in the dark. Flat, stable cracking can wait for a planned repair season. Move faster if a slab is rocking underfoot, if a step edge is crumbling where feet land, if the driveway slab has lifted enough to catch a snow shovel or a car bumper, or if water is being directed toward the foundation by a slab that has settled the wrong way.
Water in the soil under concrete expands as it freezes, lifting the slab unevenly, then leaves it to settle back, not always to its original position, as it thaws. Repeated cycles ratchet sections upward, open cracks further, and let in more water. Heaving that is worst in late winter and partly relaxes in spring is this mechanism introducing itself.
Poorly compacted fill, erosion from a downspout discharging nearby, or a leaking underground line can leave a void under part of a slab, which then sinks or cracks across the unsupported span. A slab that tilts steadily toward one corner, or a hollow sound when you stamp on a section, points to lost support rather than frost.
Concrete shrinks as it cures and can craze or crack superficially with age and sun, producing fine surface patterns that do not offset, do not grow structurally, and do not affect use. This is the reassuring end of the spectrum, and learning to recognise it saves real money, because it needs sealing or nothing, not slab work.
Heavy vehicles on a residential-thickness slab, a bin or equipment dropped on an edge, and years of de-icing salt scaling the surface can each crack or pit concrete. Salt scaling shows as a flaking, rough surface layer, worst where slush sits longest, and it is a surface durability problem rather than a base problem, which changes the remedy entirely.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $300–$800 |
| Major job — complex, hidden, or replacement-level work | $1,200–$5,000 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Homeowner scope covers marking hazards, sealing open joints and stable hairline cracks, and fixing the downspout and drainage faults that feed the problem. Slab lifting, grinding a hazardous lip down where appropriate, section replacement, and any step rebuild belong with a concrete or masonry professional, who can judge base conditions that are invisible from the surface. Be sceptical of a simple resurfacing quote over a slab that is still moving: a thin cosmetic layer over active heaving or a void cracks again within a season or two, and the honest repair starts with why the slab moved.
Some cracking is normal. Fine shrinkage cracks and surface crazing that do not offset, do not widen between seasons, and do not affect how the slab is used are a cosmetic feature of aged concrete and can simply be monitored or sealed. Cracking becomes a problem when sections lift, sink, rock, or form a lip you can feel underfoot, when cracks grow steadily, or when a slab starts directing water toward the house. Movement and offset, not cracks alone, are the dividing line.
Heaving often needs a new supply of water under the slab: a downspout that began discharging closer, a joint that finally eroded open, a small base void that let water pool, or an unusually wet autumn followed by hard frost. The slab did not suddenly become weaker; its conditions changed. That is why a proper assessment asks what changed around the slab, and why fixing drainage and joints is part of preventing the neighbouring sections from following.
Often, yes. Professionals can lift settled concrete by injecting material beneath it through small holes, restoring the level and filling the void that caused the sinking, provided the slab itself is still in one sound piece. Heaved slabs are a different case, since the cause is upward soil pressure. A slab that is badly cracked into pieces, badly scaled, or undermined over a large area is usually a replacement candidate. An on-site look is what decides, so get the slab assessed before assuming demolition.
A tilt means the steps as a structure have moved, usually because the base beneath them settled or heaved, and patching the surface does not correct a tilt or the trip hazard it creates. Depending on how far they have moved and whether they are a separate unit or poured with a landing, the remedies range from lifting and re-supporting to rebuilding the steps. Because steps concentrate fall risk, have them assessed in person, and in the meantime make the tilt obvious with a marking and good lighting.
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