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A foundation crack is a break in concrete, masonry or a slab. Some cracks are minor. Some signal movement that will continue. This page explains how to tell the difference, what repair methods do and what to ask a provider.
What the job is
Foundation crack repair covers work that seals, stabilizes or supports a cracked foundation element. The element may be a basement wall, a slab edge, a footing or a pier and beam support. The goal is to stop water entry where possible, to stop further movement where movement is active and to restore load transfer where it has been lost.
A crack repair is not always a pier job. Sealing a stable crack is a different job from lifting a settled corner. A provider should match the method to the crack cause. A wrong method can hide a problem without fixing it.
Signs you need a closer look
Hairline cracks are common. A hairline crack is thin, often less than one eighth of an inch wide. It may result from curing, shrinkage or minor seasonal movement. It still deserves a note and a photo, so you can track change.
Other patterns deserve a prompt assessment.
- Vertical cracks that widen at the top or bottom
- Diagonal cracks near doors, windows and corners
- Stair step cracks that follow mortar joints in brick or block
- Horizontal cracks in a basement wall
- Cracks with one side higher or offset from the other side
- Cracks that leak water after rain
- Cracks paired with sticking doors, sloping floors or trim gaps
A crack that grows over weeks or months is active. A crack that opens in dry weather and closes after rain may follow soil moisture. Both patterns need a measurement record, not only a visual glance.
How a provider assesses a crack
A good assessment starts outside. The provider walks the perimeter. It checks grading, gutters, downspouts and soil moisture patterns. It notes trees, irrigation and hard surfaces that direct water toward the wall.
Inside, the provider checks the crack location, length, width and direction. It checks floor levels with a level or a laser. It checks doors, windows and trim for signs of movement. It may check a crawl space or basement for moisture, wood damage and pier condition.
For a basement wall, the provider should check for bowing, bulging and horizontal cracking. For a slab, it should check for heaving, settlement and voids where possible. For a pier and beam home, it should check piers, beams and joists under the floor.
Ask what was measured. A useful report lists crack widths, floor level differences and photos with dates.
Repair methods in plain words
Epoxy injection fills a crack in poured concrete with a strong adhesive. It bonds the two sides and can restore strength in a stable crack. It is not a lift method. It does not correct settlement.
Polyurethane injection fills a crack with a flexible foam. It can seal water entry and allow slight movement. It is often used where water leaks through a crack. It does not lift a slab or straighten a wall.
Carbon fiber straps or staples bond to a wall surface. They can help hold a wall that shows early bowing. They do not push a wall back into place by themselves. They are often paired with other support work.
Wall anchors and braces support a bowing basement wall. Anchors tie a wall to stable soil outside. Steel beams brace a wall from inside. These methods address lateral pressure from soil and water.
Piers support a settled foundation from below. Steel piers, helical piers and concrete piers transfer load to deeper, more stable soil. Piers are used when settlement, not only cracking, is the main problem. See Foundation leveling and piering for pier details.
Materials and options
Concrete crack fillers differ in strength, flexibility and water resistance. Epoxy is rigid and strong. Polyurethane is flexible and water resistant. The right choice depends on crack width, water presence and whether movement is still active.
For masonry walls, mortar repair addresses surface joints. It does not fix a wall that is bowing or settling.
Cost factors
Crack length and width affect labor time. A crack behind finished walls or cabinets takes longer to reach.
Method is the largest cost driver. Injection sealing costs less than wall anchors or piers. Excavation for exterior work adds labor and restoration cost. Interior finish repair after structural work can be a separate line item.
A wall under high water pressure may need drainage work in addition to crack repair.
We do not publish a single price range here. Crack type, wall material and method vary too much. An on site quote after measurements is the useful price for your crack.
How to choose a provider
Ask for a written diagnosis, not only a price. It should name the crack type, the likely cause and the method proposed.
Ask for a written scope with method, materials, access work and finish work. Ask about permits and inspections for your city. Ask for references for similar crack types, with wall material noted.
Check licensing that applies to your job in your city and state. Ask for proof and check it with the issuing body when you can. For a large structural job, compare two scopes. Look for differences in method, not only price.
How our referral works
We do not choose a method or set a price. The provider should give a written scope and price before work starts.
Cities in this batch
See the home page for the full city list in this batch.
Frequently asked questions
When is a foundation crack urgent?
A crack is more urgent when it is wide, growing, or paired with other signs. Horizontal cracks, cracks with displacement, and cracks with water entry deserve a prompt look. A sudden change after rain, drought or plumbing work also raises urgency. If a wall is bowing or a floor has dropped suddenly, seek a local assessment promptly and avoid waiting for a routine visit.
Can a crack be sealed without piers?
Yes, in some cases. A stable hairline crack with no movement may only need sealing and monitoring. Sealing stops water entry and surface wear. It does not lift a settled slab or straighten a bowing wall. A provider should measure the crack and check for movement before deciding that sealing alone is enough for your case.
How do I track a crack over time?
Mark the ends of the crack with dated pencil lines on the wall, if the surface allows it. Take photos from the same distance and angle each month. Record width with a simple ruler, and note rain, drought and nearby work. That record shows growth, seasonal change or stability. Share it with a provider at the first assessment visit.
Does crack repair include cosmetic repair?
Not always. Structural crack repair and cosmetic repair are different jobs. A provider may seal and stabilize a crack, but leave drywall, paint or tile for a separate job. Ask for a written split before work starts. The scope should state which cracks are covered, what sealing method is used and what finish work is included or excluded.
Should I get more than one quote for crack repair?
For a large or structural crack job, yes. Compare method, materials, monitoring plan and finish work, not only total price. One provider may recommend epoxy injection. Another may recommend piers or wall bracing. Ask each provider to explain why its method fits your crack type, wall material and soil conditions in plain words.
Common questions
When is a foundation crack urgent?
A crack is more urgent when it is wide, growing, or paired with other signs. Horizontal cracks, cracks with displacement, and cracks with water entry deserve a prompt look. A sudden change after rain, drought or plumbing work also raises urgency. If a wall is bowing or a floor has dropped suddenly, seek a local assessment promptly and avoid waiting for a routine visit.
Can a crack be sealed without piers?
Yes, in some cases. A stable hairline crack with no movement may only need sealing and monitoring. Sealing stops water entry and surface wear. It does not lift a settled slab or straighten a bowing wall. A provider should measure the crack and check for movement before deciding that sealing alone is enough for your case.
How do I track a crack over time?
Mark the ends of the crack with dated pencil lines on the wall, if the surface allows it. Take photos from the same distance and angle each month. Record width with a simple ruler, and note rain, drought and nearby work. That record shows growth, seasonal change or stability. Share it with a provider at the first assessment visit.
Does crack repair include cosmetic repair?
Not always. Structural crack repair and cosmetic repair are different jobs. A provider may seal and stabilize a crack, but leave drywall, paint or tile for a separate job. Ask for a written split before work starts. The scope should state which cracks are covered, what sealing method is used and what finish work is included or excluded.
Should I get more than one quote for crack repair?
For a large or structural crack job, yes. Compare method, materials, monitoring plan and finish work, not only total price. One provider may recommend epoxy injection. Another may recommend piers or wall bracing. Ask each provider to explain why its method fits your crack type, wall material and soil conditions in plain words.