What We Fix
Foundation Problems
Stabilise and relevel your foundation — you'll notice cracks closing, gaps shrinking, and doors working again.
- Free assessment · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Trustpilot
GoogleWhat We Fix
Foundation Problems
Stabilise and relevel your foundation — you'll notice cracks closing, gaps shrinking, and doors working again.
- Free quote · 1–2 day repair · 20-year warranty
- Structural Engineers · Licensed Builders · Skilled Technicians
Foundation Problems
Stabilise and relevel your foundation — you'll notice cracks closing, gaps shrinking, and doors working again.
- Free structural assessment with a fixed-price quote
- No digging — most foundations relevelled in 1–2 days
- 20-year product and workmanship warranty
Structural Engineers · Licensed Builders · Skilled Technicians
TrustpilotGoogleDoes my home have a foundation problem?
Cracks in the brickwork. Doors that used to close fine but now jam. Floors that slope towards one end of the house. Gaps opening between walls and ceilings. Most homeowners notice the symptoms long before they know the cause — and the cause is almost always below, not above. Something has changed in the ground beneath your home.
The foundation hasn't failed. The ground beneath it has moved. It may have shrunk, washed away, shifted sideways, or never been compacted properly in the first place. Whatever the trigger, the result is the same: the foundation loses support, and the house responds with cracks, movement, and misalignment. When the sinking is uneven, it's called subsidence.
The good news: foundation problems are fixable. The ground can be stabilised, voids filled, and the foundation lifted back towards level. As it does, homeowners typically see cracks closing, gaps shrinking, and doors working again. The symptoms below will help you work out what your home is telling you.
What are the symptoms of foundation problems?
Your home tells you when something is wrong. These are the most common signs of a foundation problem.
Stepped Cracks in Brickwork
Stepped cracks follow the mortar joints in a staircase pattern — up one joint, along the next. They typically appear at corners, around windows, or where an extension meets the original house. A single hairline crack might be cosmetic. But if the crack is wider than a few millimetres, appears on both sides of the wall, or keeps coming back after filling — the foundation beneath that section has moved.
Doors and Windows That Stick
The door that used to close perfectly now drags on the floor. The window you have to force shut every evening. When the foundation shifts — even by a few millimetres — the frames twist out of square. Doors bind, latches miss their catches, and gaps appear at the top of the frame while the bottom jams tight. If it is getting worse over time, the ground is still moving.
Sloping or Uneven Floors
Place a ball on the floor — if it rolls, the floor is not level. A table that wobbles, a cabinet door that swings open on its own, a chair that rocks on a surface that used to be flat. As the foundation moves unevenly beneath the house, the floors follow. The slope may be subtle at first, but it tends to get worse as the ground continues to shift.
Gaps at Cornices and Ceilings
Gaps opening between the cornice and the ceiling, or between the wall and the cornice. These often appear gradually — a millimetre one month, two the next. On their own, ceiling gaps are common and often cosmetic. But combined with wall cracks, sticking doors, or sloping floors, they point to the same cause: the foundation beneath has shifted and the structure above is following.
Cracks Above Windows and Doors
Diagonal cracks radiating from the corners of door and window openings are one of the most common signs of foundation movement. The opening is the weakest point in the wall — when the foundation shifts, the stress concentrates there first. If the cracks are wider at the top than the bottom, the ground on one side of the opening has dropped more than the other.
What are the signs of a foundation problem?
How to fix foundation problems
Non-Invasive. Laser-Monitored. Guaranteed.
Stabilise and Relevel Your Foundation.
Traditional underpinning meant digging beneath your home, pouring concrete piers, and waiting weeks for it to cure. It worked — but it was slow, disruptive, and expensive. Most homeowners dreaded the process as much as the problem itself.
GeoPoly™ GER60 changed all of that. Instead of digging, a structural-grade geopolymer resin is injected through small, coin-sized holes drilled around the problem areas. The resin travels under controlled pressure, targeting the exact point where the foundation has lost support. Within minutes, it begins to harden — tougher than the original ground — filling voids, compacting weak soil, and lifting the foundation back towards level.
Every millimetre of movement is tracked in real time using laser levelling equipment and digital sensors. As the foundation relevels, you'll notice cracks closing, gaps shrinking, and doors working again. What used to take weeks now takes just 1–2 days in most cases. And at a fraction of the cost.
Not sure what's causing the problem? Get in touch for a free foundation assessment. A structural engineer will inspect your home, identify the root cause, and explain exactly what needs to happen — before any work starts.
What to expect
A step-by-step guide of how the foundation repair process works — from assessment to completion.
Step 1Free Structural Assessment
A Buildfix engineer assesses the damage, identifies the root cause, and designs a repair plan on-site. Measurements, photos, and markings are recorded using mobile software — and the price can usually be explained there and then, so you know exactly where you stand.
Step 2Get Your Quote and Book
A complete quote package arrives — detailed drawings, repair method statement, and a fixed-price quote. The price you see is the price you pay. When you’re ready, book through the online portal and suitable dates are organised for the work.
Step 3Drill for Access
Small, coin-sized holes are drilled at precise intervals around the problem areas. These allow the injection pipes to reach the exact depths needed beneath your footings.
Step 4Inject, Lift, and Level
GeoPoly™ resin is injected through the access points. The resin expands to fill voids and weak spots, then lifts and relevels your foundation. Laser levelling equipment and digital sensors monitor every millimetre of movement in real time — so the lift is precise, controlled, and exactly right.
Step 5Patch and Clean Up
The drill holes are patched and the site is cleaned. Your home looks exactly as it did before — except now it’s on solid ground.
Step 6Receive Your Warranty
Your 20-year product and workmanship warranty arrives via email with the Completion Package — a job report covering the work, materials, and images.
See the difference
Actual GeoPoly™ foundation repairs — before and after.
Instant results.
Guaranteed to last.
The benefits of fixing foundation problems with GeoPoly™.
Foundation problems start in the ground — and that’s where GeoPoly™ works. Injected beneath your footings and monitored in real time with laser equipment, the foundation is lifted back towards level. You’ll notice cracks starting to close and doors working again.
Not sure if it's subsidence? Get your home assessed for free — we'll explain exactly what's going on and what can be done.
Real homes. Real results.
15,000+ homes and structures repaired. Want to see real Buildfix foundation repairs? Browse a few below.
HomeownerKeilor East, VIC
Underpinning Failed — Resin Fixed It
After traditional concrete underpinning failed and brand-new windows wouldn’t fit, GeoPoly™ resin injection stabilised the foundation in a single day — with millimetre precision.
HomeownerStrathfield, NSW
Heritage Home Repaired Twice, Same Team
When new cracks appeared in this 150-year-old Strathfield home, the owner didn’t hesitate — they called Buildfix again. Buildfix had already fixed the front of the house years earlier. This time, the team tackled the rear.
CommercialBlack Mountain, ACT
CSIRO’s Research Facility Relevelled
When Australia’s national science agency — the country’s foremost authority on foundation subsidence — needed their own buildings fixed, they called Buildfix.
StrataKensington, NSW
1920s Apartment Stabilised After Light Rail
Light Rail construction shook a century-old apartment block to its foundations. GeoPoly™ stabilised six residences at a fraction of underpinning costs — residents never had to leave.
HomeownerKingsgrove, NSW
Flood-Damaged Foundation Fixed in a Day
Surface water eroded the foundation and shifted a wall outward. GeoPoly™ filled the voids, raised the wall 20mm, and realigned the brickwork — all in one day.
HomeownerMawson, ACT
Sinking Corner Lifted 10mm and Stabilised
A recently patched corner cracked open again — proof that cosmetic fixes don’t work. GeoPoly™ lifted the corner 10mm and stabilised the reactive clay foundation permanently.
HomeownerBalnarring Beach, VIC
Hidden Tree Roots Behind Foundation Damage
Years of unexplained subsidence traced to a hidden tree root system. GeoPoly™ stabilised the footing and lifted the foundation — the real cause was hiding in plain sight.
HomeownerMurrumbateman, NSW
Auction-Ready After a 25mm Foundation Lift
Significant cracks and rotating walls threatened to derail an auction. GeoPoly™ lifted the foundation 25mm and closed the cracks in a single day — making the home auction-ready.
HomeownerMays Hill, NSW
Brick Veranda Realigned to Save the Roof
A veranda pulling away from the house, columns rotating, and a roof at genuine risk of collapse. Foundation stabilisation and HelicalBar™ repair resolved everything in a day.
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
Questions?
Our team is here to answer any questions you may have Monday – Friday 8am to 4pm AEST. Give us a call on 1300 854 115.
