Basement Crack Repair Cost
Price a basement or foundation crack repair by what the crack actually looks like — $250–$800 per crack for injection, or thousands if it's horizontal. Includes which material works on your crack and when it's structural.
Not all basement cracks are the same problem. A hairline shrinkage crack is a few hundred dollars; a horizontal crack means soil is pushing your wall in and costs thousands. Describe what you're looking at and this prices the right fix — including which material actually works on your crack.
What does the crack look like?
The single most important question — appearance tells you both the cause and the fix. Hairline, dry, and unchanged is the everyday concrete shrinkage crack. A vertical or diagonal crack with water seeping through needs a flexible sealant that works on wet concrete. A wider dry crack (over about 1/8 inch) is where a rigid structural repair makes sense. A horizontal crack, or a stair-step crack following the mortar joints in a block wall, is different in kind: it means soil is pushing the wall inward, and no amount of filler fixes that.
How many cracks?
Count the cracks you'd want repaired. Injection is priced per crack, so this scales the total directly. If you're counting more than a handful on one wall, that pattern itself is worth an evaluation — many cracks usually means one underlying cause rather than several coincidences.
Any signs the foundation is moving?
Look beyond the crack itself: doors or windows that stick or won't latch, new cracks in interior drywall or ceilings, floors that sag or feel uneven, or a wall that visibly bows inward. Any of these mean the foundation is still moving — and injecting a crack that's still moving just re-cracks it. If you see them, the money goes to diagnosis and stabilization first.
Crack repair, professionally injected
$500–$1,600
Polyurethane injection · 2 cracks at $250–$800 each
Water in the crack? It has to be polyurethane
This is the one material choice you can't get wrong: epoxy won't bond to a wet surface. Polyurethane is injected as a foam that expands into the crack, seals against water, and — importantly — stays flexible, so it survives the seasonal freeze-thaw movement that would crack a rigid filler. It seals water; it doesn't restore structural strength.
Fix the water, not just the crack
Injection stops water coming through that crack — it does nothing about why water is against your wall. Before spending more, do the cheap things first: extend downspouts well away from the house and regrade so soil slopes away. If water keeps finding new paths in, the honest answer isn't more injections — it's a drainage system, which is a different project and budget.
Non-structural cracks are priced per crack for professional injection; horizontal, stair-step, or moving cracks are priced as structural projects, where an engineer's assessment — not a crack count — sets the real scope. Excludes removing finished walls for access, interior finish repair afterward, and any drainage work. 2026 figures — get local bids.
💡About this calculator▼
A crack in your basement wall is either a few hundred dollars or a five-figure problem, and the difference isn't the size of the crack — it's the direction it runs. That's the single most useful thing to know before you call anyone, because it determines whether you're buying a straightforward repair or a structural project.
Vertical and diagonal cracks are the common, usually benign kind: concrete shrinks as it cures and settles slightly, and nearly every poured foundation develops a few. These get repaired by injection at $250 to $800+ per crack, and the only real decision is which material — which comes down to whether water is coming through. Horizontal cracks, and stair-step cracks that follow the mortar joints in a block wall, are a different animal: they mean soil outside is pushing the wall inward. No filler fixes that. Those run $1,000 to $5,000+ for minor structural work and $10,000 to $30,000+ when the damage is major.
The material question has a clear right answer, and it's the one homeowners most often get wrong. Polyurethane is injected as an expanding foam that seals against water and stays flexible afterward, so it survives seasonal freeze-thaw movement — and critically, it's the only option for a crack that's actively leaking, because epoxy will not bond to wet concrete. Epoxy cures harder than the surrounding concrete and effectively welds the two faces back together, restoring structural strength — but it needs a crack that's dry and no longer moving. Pick wrong and you pay twice.
Describe your crack below — its appearance, how many there are, and whether you're seeing signs the foundation is still moving — and you'll get the right method and a realistic cost, plus a straight answer about when you should be calling a structural engineer instead of a repair contractor.
The crack's appearance routes the job; the cost follows the route.
Non-structural cracks (vertical or diagonal) — priced per crack: • Hairline and dry ≈ $250–$500 — concrete shrinkage, the least expensive to fix • Actively leaking ≈ $250–$800 — polyurethane injection (flexible, seals wet cracks; epoxy can't bond to wet concrete) • Wide but dry (over ~1/8 in.) ≈ $350–$800 — epoxy injection (cures harder than the concrete, restores strength)
Multiply by the number of cracks — injection is priced per crack.
Structural cracks (horizontal or stair-step) — priced as a project, not per crack: • Minor ≈ $1,000–$5,000+ · Major (with active movement) ≈ $10,000–$30,000+ • Reinforcement methods: carbon fiber strips $900–$2,000+ per crack · wall anchors $500–$1,000 each · helical tiebacks $1,000–$3,000 each
The movement override: sticking doors, uneven or sagging floors, new drywall cracks, or a visibly bowing wall mean the foundation is *still moving* — and injecting a crack that's still moving just re-cracks it. Any of those signs routes you to the structural path regardless of what the crack looks like, because the money belongs in diagnosis and stabilization first.
📐How it's calculated▼
Non-structural: total = per-crack injection cost × number of cracks. Structural: priced as a project.
Per crack: hairline dry $250–$500 · leaking (polyurethane) $250–$800 · wide dry (epoxy) $350–$800 Structural: minor $1,000–$5,000+ · major $10,000–$30,000+ · carbon fiber $900–$2,000+ per crack
Example — two leaking vertical cracks, no movement signs:
→ 2 × $250–$800 = $500–$1,600, polyurethane injection.
Example — one horizontal crack, no movement yet:
→ $1,000–$5,000+ — structural minor. Note this is *not* 1 × the injection rate: a horizontal crack isn't a filling job at all, and carbon fiber reinforcement alone runs $900–$2,000+ per crack.
Example — horizontal crack with sticking doors and a bowing wall:
→ $10,000–$30,000+ — major structural. Engineer first; the assessment sets the scope.
🔍Finding your inputs▼
What does the crack look like? The most important input, because appearance reveals cause. Hairline and dry — a thin crack, no moisture, not visibly changing — is ordinary shrinkage from the original concrete cure; nearly every poured foundation has a few. Vertical or diagonal and actively leaking means water is finding a path through; the crack itself is usually still non-structural, but it needs a material that works on wet concrete. Wide but dry (roughly over 1/8 inch, about the thickness of two stacked quarters) with no water is where a rigid structural repair earns its cost. Horizontal or stair-step — running side to side across the wall, or climbing diagonally along the mortar joints in a block wall — is the one to take seriously: it's the signature of lateral soil pressure pushing the wall inward, often from saturated soil or frost, and it is a structural finding regardless of width.
How many cracks? Count what you'd want repaired; injection is priced per crack, so this scales the total directly. One note worth acting on: if you're counting more than a handful on a single wall, that pattern is itself information. Several cracks usually share one cause — a drainage problem, a settling corner, seasonal soil movement — and repairing them individually without addressing that cause tends to be money spent twice.
Any signs the foundation is moving? Look past the crack at the house around it: doors or windows that stick, won't latch, or have visibly out-of-square gaps; fresh cracks in interior drywall or at ceiling corners; floors that sag, slope, or feel uneven; a basement wall that bows inward when you sight along it. These are the classic warning signs contractors and engineers look for, and any one of them changes the answer — because a crack in a foundation that's still moving will simply re-crack after it's filled. If you're seeing them, the first purchase isn't a repair, it's a diagnosis.
⚠️Special situations▼
Can I repair a foundation crack myself with a DIY kit?
For a hairline, dry, non-structural crack, yes — and for anything else, the honest answer is that DIY is a gamble on a diagnosis you may not be qualified to make. Start with what the products actually are. Hydraulic cement and patching compound ($15–$30) fill a crack at the surface; they're genuinely useful for cosmetic sealing and for keeping radon and casual moisture out, but they're rigid and surface-only, so they don't tolerate any movement and they don't address water under pressure — a patched crack that's still moving or still wet reopens, usually within a season or two. Homeowner injection kits are the real DIY option, and they range enormously: consumer polyurethane and epoxy kits run roughly $90–$225 and cover perhaps 10 feet of crack, while professional-grade kits sold as 'DIY' can exceed $700. What you're paying a contractor for at $250–$800 per crack is mostly diagnosis and technique — reading whether the crack is structural, choosing the right material, setting ports at correct spacing, and injecting at low pressure so the material travels the full depth of the wall rather than just the surface. That last point is where most DIY jobs fail: material that fills the visible groove but never reaches the outside face leaves the crack functionally unsealed. Reasonable DIY candidates: a thin, dry, stable vertical crack you want sealed against moisture and radon; a small leak in an unfinished utility area where a failed attempt costs you only the kit. Not DIY: anything horizontal or stair-step, anything with movement signs elsewhere in the house, cracks wider than about 1/4 inch, cracks that have been repaired before and returned, and anything in a finished space where a failure means tearing out drywall. One more consideration if you're planning to sell: a professionally documented repair, often with a transferable warranty, is worth more to a buyer's inspector than an unexplained smear of hydraulic cement — which tends to read as a hidden problem rather than a solved one.
How do I tell whether my crack is structural or just cosmetic?
Direction first, then width, then behavior — and if any of the three worries you, an engineer's few hundred dollars beats guessing. Direction is the strongest single signal. Vertical and diagonal cracks are typically shrinkage or minor settling and are usually non-structural, especially near the middle of a wall or radiating from window and door corners where concrete naturally cracks. Horizontal cracks are the serious ones: a wall that's cracked side-to-side is being pushed inward by soil pressure, commonly from saturated soil or frost driving against the outside. In block walls, stair-step cracking that climbs the mortar joints carries the same meaning. Width comes next: hairline cracks (under about 1/16 inch, thinner than a dime's edge) are almost always benign, cracks between 1/16 and 1/4 inch deserve monitoring and sealing, and anything wider than about 1/4 inch merits professional assessment regardless of direction. Displacement matters more than width — if one side of the crack sits proud of the other, or you can feel a lip running your finger across it, the wall has actually moved rather than merely opened. Behavior is the third test, and it's free: mark both ends of the crack with a pencil line and today's date, note the width at the widest point, and check every few months. A crack that hasn't changed in a year is dormant. One that lengthens, widens, or begins weeping is active and changes the recommendation. Finally, look away from the wall entirely — sticking doors and windows, new drywall cracks upstairs, sloping floors, or a gap opening where a floor meets a wall all say the foundation is moving, and a moving foundation makes even an innocent-looking crack a structural conversation. When two or more signals point the same way, stop shopping for repairs and buy an assessment: a structural engineer is independent of the companies selling the fix, which is exactly what makes the money well spent.
A foundation company quoted me $18,000 for piers. How do I know if that's legitimate?
Get an independent structural engineer's assessment before signing anything — that single step is the difference between an informed five-figure decision and an expensive guess. The structural issue here isn't that foundation contractors are dishonest; it's that in this industry the party diagnosing the problem is almost always the party selling the solution, and their diagnostic toolkit tends to recommend the products they install. An engineer takes a few hundred dollars, has no product to sell, and produces a written assessment describing what's actually wrong and what class of repair it requires. That document then becomes your specification: you hand the same scope to three contractors and get bids that are genuinely comparable, instead of three different diagnoses at three different prices. Things worth checking in any large quote. Does the proposed fix match the failure mode? Piers and underpinning address vertical settlement — a foundation sinking — while bowing walls from lateral soil pressure call for carbon fiber, anchors, or tiebacks instead ($900–$2,000 per crack for carbon fiber, $500–$1,000 per wall anchor, $1,000–$3,000 per helical tieback), and drainage problems call for drainage. A quote that prescribes piers for a bowing wall deserves a hard question. Has anyone investigated water? Most foundation movement is water-driven, and correcting downspouts, grading, and drainage is dramatically cheaper than structural hardware — a contractor who never mentions water hasn't finished diagnosing. Is the scope itemized, with a count of piers or anchors and their unit price, so you can compare bids line by line? Is there an engineered drawing behind it? Is the warranty transferable to a future buyer, and is the company likely to outlive it? And treat pressure tactics as information: same-day discounts, a free inspection that discovers urgent danger, and a contract offered before you've slept on it are the standard playbook. Legitimate foundation work absolutely can cost $18,000 — plenty of homes genuinely need it. The point isn't that the number is wrong; it's that you should learn whether it's right from someone who doesn't get paid either way.
We had a crack injected and it's leaking again — what went wrong?
Almost always one of four things, and only one of them is a bad injection job. First and most common: the crack was still moving. Injection assumes the crack has stabilized; if the foundation continues to shift seasonally — freeze-thaw, expansive clay soils that swell and shrink with moisture, ongoing settlement — a rigid epoxy repair fractures again, often as a fresh hairline right beside the original line. This is precisely why polyurethane, which stays flexible after curing, is preferred wherever movement is expected, and why signs of ongoing movement should route you to stabilization before sealing. Second: the water found a different path. Sealing one crack doesn't lower the water table or reduce hydrostatic pressure against the wall; it just closes one door. When the pressure stays, water commonly reappears at the cove joint where floor meets wall, at a different crack, or through a porous block. If your 'repair failure' is actually water at a new location, the crack repair worked and the diagnosis was incomplete — the real prescription is drainage. Third: the wrong material. Epoxy will not bond to wet concrete, so an epoxy injection into a damp or actively weeping crack can look fine on the surface and be unbonded at depth, failing at the first sustained rain. Fourth: incomplete injection — ports spaced too far apart, pressure too high (which pushes material out the surface rather than through the wall), or material that never reached the exterior face. A properly injected crack should be filled front to back, which is why professional technique carries most of the cost. What to do now: call the original contractor first, since quality crack injection is frequently warrantied and a reputable company will return. Simultaneously, look outside for the cause — downspout discharge next to the foundation, ground sloping toward the house, a downspout tied into a failed underground line. And if it's now failed twice, stop buying repairs and buy a diagnosis; a second failure is strong evidence that the problem was never the crack.
❓Common questions▼
How much does it cost to repair a basement or foundation crack?
For cracks that don't threaten the home's structure — hairline, vertical, or diagonal — professional repair costs $250 to $800 or more per crack, with hairline cracks at the cheap end and wider ones toward the top of the range. That covers crack injection, where a contractor sets ports along the crack and pumps epoxy or polyurethane through the full thickness of the wall under pressure. Since it's priced per crack, three cracks is roughly three times one. Structural cracks are a different order of magnitude: horizontal cracks and the stair-step cracks that climb mortar joints in block walls signal soil pressure pushing the wall inward, and repairs run $1,000 to $5,000 or more for minor cases and $10,000 to $30,000 or more when the damage is major. The specific structural methods price separately — carbon fiber strips at $900 to $2,000 or more per crack for bowing walls, wall anchors at $500 to $1,000 each, helical tiebacks at $1,000 to $3,000 each, and underpinning from $2,000 up to $30,000 or more depending on severity. What moves the number within any band: crack width and length, wall access (a finished basement may need drywall removed and rebuilt, which this estimate excludes), how many cracks share the same wall, and regional labor rates. What isn't included, and often matters more: fixing the water problem that caused the crack. Use the calculator above to describe your specific crack and get the right method and range — and if the answer comes back structural, budget a few hundred dollars for an independent structural engineer before hiring anyone.
Epoxy or polyurethane — which one does my crack need?
The deciding question is whether the crack is wet, and it's not a close call. Use polyurethane for any crack that's actively leaking or damp. It's injected as a liquid that foams and expands to fill the void, seals reliably against water, and — the property that matters most — stays flexible after curing, so it tolerates the seasonal expansion and contraction that freeze-thaw cycles put through a foundation wall. Just as importantly, it works on wet concrete, whereas epoxy will not bond to a wet surface at all: an epoxy injection into a weeping crack can look complete and be unbonded inside the wall, failing at the next heavy rain. Use epoxy for cracks that are dry and no longer moving, when you want the wall's strength restored rather than merely sealed. Cured epoxy is harder than the surrounding concrete and effectively welds the two faces back into a single structural unit — a genuine repair rather than a gasket. The trade-off is rigidity: on a crack that's still moving, that hardness works against you and the wall simply cracks again nearby. In practice this means the majority of residential basement crack repairs — the leaky vertical crack in an otherwise sound wall — are polyurethane jobs, and epoxy is reserved for dry structural cracks in walls that have stopped moving. Cost isn't the tiebreaker; both fall inside the same $250 to $800+ per crack range, so choosing on price rather than condition is how people end up paying twice. Two things neither material can do: fix a horizontal crack caused by soil pressure (that needs structural reinforcement — carbon fiber, anchors, or tiebacks) and lower the water pressure against your foundation (that needs drainage). If a contractor recommends epoxy for a crack you've watched water run out of, ask them directly how they'll get it dry and keep it dry.
Are foundation cracks serious? When should I worry?
Most aren't. Concrete shrinks as it cures, and virtually every poured foundation develops thin vertical cracks in its first years — finding one is normal, not an emergency. Worry when the crack shows any of these characteristics. Direction: horizontal cracks running side to side across the wall, or stair-step cracks climbing the mortar joints of a block wall, indicate lateral soil pressure pushing the wall inward and are structural findings at any width. Width: anything wider than about 1/4 inch warrants professional assessment; between 1/16 and 1/4 inch deserves sealing and monitoring; under 1/16 inch is almost always cosmetic. Displacement: if the two sides of the crack are offset — you can feel a lip dragging a finger across it — the wall has moved, not merely opened, which is more meaningful than width alone. Change over time: mark the ends with a pencil and the date, and re-check every few months; a crack that grows longer or wider, or begins weeping when it used to be dry, is active. Water: any crack passing water should be sealed regardless of structural status, both to protect finishes and because chronic moisture drives mold and, in many regions, radon entry. And look beyond the wall: doors and windows that begin sticking, fresh drywall cracks at ceiling corners, sloping or bouncy floors, or a wall that bows visibly when you sight along it all suggest the foundation is moving, which turns even a modest-looking crack into a structural question. The good news is that early attention is cheap — sealing a small crack costs a few hundred dollars, while the structural repairs that follow years of ignored movement run into five figures. When two or more warning signs line up, spend a few hundred dollars on an independent structural engineer rather than a contractor's free inspection; you'll get a diagnosis instead of a sales call.
Does homeowners insurance cover foundation crack repair?
Usually not for the common causes, though there are real exceptions worth checking your policy for. Standard homeowners policies typically exclude damage from earth movement — settling, soil expansion and contraction, and shifting — as well as damage attributed to poor maintenance, construction defects, or gradual water seepage over time. Since those causes account for most foundation cracks, most claims for cracked basement walls are denied, which surprises homeowners who assumed structural damage was exactly what insurance was for. Where coverage often does apply: sudden, accidental events specifically named in your policy, most commonly a plumbing failure — a burst supply line or a leaking water line under the slab that saturates soil and damages the foundation is frequently covered, though the policy may pay for the resulting damage while excluding the pipe repair itself. Damage from an explosion, a vehicle impact, fire, or in some regions a covered weather event may also qualify. Flooding and earthquake damage are excluded from standard policies entirely and require separate flood or earthquake coverage, which matters in regions where expansive clay or seismic activity is the actual driver of foundation movement. Practical steps: read your policy's exclusions section rather than relying on general guidance, photograph and date any crack when you first notice it (documentation of a sudden appearance versus gradual growth genuinely affects claims), and if you suspect a plumbing leak is involved, get that established by a plumber or engineer before repairs begin, since causation determines coverage. If a contractor tells you insurance will certainly cover the work, treat that as a sales claim rather than a coverage opinion and confirm with your carrier in writing. Finally, note the resale angle: because insurance rarely covers this, documented professional repairs — ideally with a transferable warranty — carry real weight with future buyers and their inspectors.
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