Wall Crack Repair Adelaide - Structural Crack Repair Specialists
From hairline cracks to structural splits, repaired properly and backed by a 10-year guarantee.
Licensed Builder
Fully Insured
25+ Years Experience
10-Year Guarantee
Adelaide's Wall Crack Repair Specialists
Cracks in your walls are the most common warning sign of a home that’s moved. AllenCo Construction is a licensed builder repairing cracked walls, damaged brickwork and structural cracks across Adelaide and South Australia.
We’ve been crack-stitching, rendering and restoring cracked walls for over 25 years, and because we diagnose what’s causing the crack before we repair it, the crack stays closed for good.
Why Is My Wall Cracking?
Your wall is cracking because the ground beneath your foundation has moved. When the soil under your footings swells, shrinks, or washes away, the foundation shifts, and the walls crack as the structure flexes. There are 4 main causes of wall cracks in Adelaide homes.
Reactive Clay Soil
Plumbing Leaks
Tree Roots
Poor Drainage
Stormwater and poor site drainage erode the soil that supports your footings, leaving sections unsupported.
A hairline crack is usually cosmetic, but a crack wider than 3mm, one that runs on a diagonal, or a stair-step crack through the brickwork points to foundation movement. When movement is the cause, the wall needs underpinning before the crack is repaired, otherwise the crack reopens.
The Right Repair for Every Crack
Wall cracks fall into 3 severity tiers, and each tier has its own repair method. The right repair depends on the width of the crack, the location, and whether the underlying cause has been addressed first.
Hairline Cracks Under 3mm
Cracks Between 3mm and 10mm
Structural Cracks Over 10mm
Why Choose AllenCo Construction
Licensed Builder, Fully Insured
Award-Winning Builder
We Fix the Cause
10-Year Guarantee
See What Our Customers Are Saying
How We Repair Cracked Brick Walls
Cracked brick walls are repaired by stitching the masonry back together and restoring the brickwork across the crack. For a cracked brick wall caused by foundation movement, the foundation is stabilised first, then the crack is repaired permanently.
AllenCo Construction repairs cracked brickwork using Thor helical ties, a stainless steel tie grouted horizontally into the mortar joints across the crack. The ties bind the brickwork back together and restore the structural integrity of the wall. For face brick where the finish needs to stay exposed, the cracked mortar is raked out, the helical ties are bedded in, and the joint is repointed to match the existing brickwork. Where the wall is rendered, the repair is covered with expanded mesh, re-rendered and finished to match the surrounding surface.
Whether it’s a single cracked brick, a stair-step crack through the mortar, or a full structural split, the goal is the same: a brick wall that’s tied back together and built to stay that way.
Leaning Brick Wall Repair
A leaning brick wall is a sign the wall has lost its structural support and needs attention before it fails. Leaning walls happen for 3 main reasons, and the repair depends on the cause.
Foundation Movement
Failed Wall Ties
Ground and Retaining Pressure
Leaning boundary and retaining walls are often pushed by soil pressure or poor drainage behind the wall. The cause is addressed, and the wall is reinforced or rebuilt as needed.
A leaning wall rarely fixes itself and usually gets worse over time. The sooner it’s inspected, the more likely it can be tied back rather than rebuilt.
Wall Crack Repair FAQs
Are wall cracks serious?
Wall cracks are serious when they’re wider than 3mm, run diagonally or vertically, appear above doors and windows, or show as stair-step cracks through brickwork. These point to structural movement in the foundation. Hairline cracks under 3mm are usually cosmetic. The only way to know for sure is a professional inspection.
When is a wall crack structural?
A wall crack is structural when it’s wider than 3mm, runs on a diagonal, widens at one end, or appears in a stair-step pattern through the mortar joints. Structural cracks are caused by foundation movement and will reopen if the crack is patched without stabilising the foundation first.
Can you repair wall cracks without underpinning?
You can repair hairline cracks under 3mm without underpinning if there’s no ongoing foundation movement. Structural cracks over 3mm are almost always caused by foundation movement, and repairing them without underpinning first means the crack will return. We diagnose the cause before recommending a repair.
How much does wall crack repair cost?
Wall crack repair cost depends on the severity of the crack, the repair method required, and whether the foundation needs underpinning first. Cosmetic hairline repairs are at the lower end, while structural crack stitching and underpinning are quoted on inspection. We provide free on-site quotes based on what your wall actually needs.
Will the crack come back after repair?
A repaired crack comes back if the underlying cause isn’t addressed first. Because we diagnose and fix the cause of the movement before repairing the crack, our repairs hold. All wall crack repairs are backed by our 10-year guarantee.
Get Your Wall Cracks Repaired Properly
Join hundreds of South Australian homeowners who’ve had their cracked walls repaired by AllenCo Construction.
Free quote. Licensed builder. Custom workmanship.
*Cracks getting wider? Doors sticking? Brickwork pulling apart? Don’t guess at the cause, get a proper diagnosis. We come to you, inspect the cracks, identify what’s causing them, and give you a clear, accurate quote.