Buildfix technician inspecting foundation beneath subfloor with cracked walls above

Solutions

Foundation Repair

Stabilise and relevel your foundation with GeoPoly™ — no digging, done in 1–2 days.

  • Free assessment · 1–2 day repair · 20-year warranty
  • Structural Engineers · Licensed Builders · Skilled Technicians
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What is foundation repair?

Foundation repair is the process of stabilising and relevelling the ground beneath your home's footings — the concrete strips or pads that carry the weight of everything above. When that ground moves, the footings lose support, the house sinks unevenly — what's known as subsidence — and the damage shows up everywhere: cracks in walls, sticking doors, sloping floors.

Here's what most homeowners don't realise: the footings themselves almost never fail. It's the ground beneath them that moves — and once the ground goes, everything above follows. Foundation repair fixes the ground so the footings sit on something solid again.

Modern foundation repair uses GeoPoly™ GER60 expanding geopolymer resin injected through coin-sized holes to fill voids, compact weak soil, and lift the foundation back towards level. The same technology used in underpinning — what used to take weeks of digging and concrete now takes 1–2 days.

Why does a home need foundation repair?

A sinking foundation puts uneven load on everything above it — walls crack, doors jam, floors slope, and gaps open between walls and ceilings. Those symptoms are your home telling you the ground has moved.

Foundation repair stabilises and relevels the ground beneath the footings. As it does, you'll notice cracks starting to close, doors working again, and floors feeling solid underfoot.

The traditional ways of foundation repair a home

Each method works — done right, they’re legitimate engineering solutions. But each comes with trade-offs worth understanding.

Trenches dug beside brick wall footings for mass concrete underpinning

Mass Concrete Underpinning

Sections of soil are dug out beneath the footings in sequence, then filled with mass concrete to form new, deeper support piers. It works — but it’s essentially a complete new footing construction. Months of engineers, certifiers, builders, and contractors. To say disruption is an understatement.

Helical screw pile being driven into the ground for foundation repair

Screw Pile Underpinning

Helical steel piles are screwed into the ground beneath the footings using hydraulic torque motors, then bracketed to the structural walls. Effective for hillside homes and areas prone to landslips. The trade-off: heavy equipment needs access to every pile location, which in a residential backyard can be a significant problem.

Reinforced concrete beam and base pads beneath a brick wall footing

Pier and Beam

Reinforced concrete pads are poured at depth beneath the footings, then connected by a concrete beam that redistributes the wall’s load. It’s the heavy-duty traditional method — effective for larger structures. The trade-off: significant digging, formwork, steel reinforcement, and curing time. Weeks of work.

The traditional ways of repairing foundations

How foundation repair works with GeoPoly™

Non-Invasive. Permanent. Guaranteed.

No Digging. No Concrete Piers. A Fraction of the Cost.

Your home is sinking because the ground beneath the footings has softened, washed away, or become aerated. Fill that space. Stabilise the ground. Problem solved. That's the principle behind GeoPoly™ foundation repair — it's like keyhole surgery for your home's foundation.

GeoPoly™ resin is injected through coin-sized holes drilled around the problem areas. The resin travels under pressure, targeting the exact point where the movement is occurring. Within minutes it begins to harden, tougher than the original ground, expanding beneath the footings to fill voids and compact weak soil.

As the foundation lifts back towards level, you'll notice cracks closing, gaps shrinking, and doors working again. What used to take months of traditional foundation repair now takes just 1–2 days.

Not sure what your home needs? That's what the free assessment is for.

Compare with traditional

What to expect

How the foundation repair process works — from assessment to completion.

Buildfix structural engineer assessing foundation subsidence with laser level equipmentStep 1

Free Structural Assessment

A Buildfix engineer inspects your home, identifies the root cause of the movement, and designs a foundation repair plan on-site. Measurements, photos, and markings are recorded using mobile software — and the price is usually explained there and then.

Buildfix quote package showing foundation repair detail and fixed-price quoteStep 2

Get 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 foundation repair.

Buildfix technician drilling small coin-sized access holes for GeoPoly injectionStep 3

Drill 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 for the foundation repair.

Buildfix technicians injecting GeoPoly resin beneath foundations for foundation repairStep 4

Inject, Lift, and Level

GeoPoly™ resin is injected through the access points. The resin targets and fills voids and weak spots in the soil, then lifts the foundation back towards level. Laser levelling equipment and digital sensors monitor every millimetre of movement in real time.

Patched drill holes after GeoPoly foundation repair with clean siteStep 5

Patch and Clean Up

The foundation repair drill holes are patched, the site is cleaned, and your home looks exactly as it did before. Except now it’s on solid ground.

Buildfix 20-year product and workmanship warranty badgeStep 6

Receive 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 Buildfix foundation repair repairs — before and after.

Foundation repair before and after — brick wall crack closed
Foundation repair before and after — subsidence re-levelled
Foundation repair before and after — render crack closed
Foundation repair before and after — sunken footing lifted
Foundation repair before and after — brickwork damage repaired
Foundation repair before and after — settlement re-levelled
Foundation repair before and after — wall separation closed
Foundation repair before and after — crack repaired
Foundation repair before and after — stabilisation complete
Foundation repair before and after — brick wall re-levelled

Instant results.
Guaranteed to last.

The benefits of GeoPoly™ foundation repair.

Foundation repair with GeoPoly™ targets the ground beneath your footings — not the footings themselves. Laser equipment monitors every millimetre of movement in real time. As the foundation lifts back towards level, you’ll notice cracks starting to close and doors working again.

GeoPoly resin injection beneath brick house with laser levelling equipment monitoring precision

Real homes. Real results.

15,000+ homes and structures repaired. Want to see real Buildfix foundation repair projects? Browse a few below.

Underpinning Failed — Resin Fixed ItHomeowner

Keilor 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.

Read case study
Heritage Home Repaired Twice, Same TeamHomeowner

Strathfield, 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.

Read case study
CSIRO’s Research Facility RelevelledCommercial

Black 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.

Read case study
1920s Apartment Stabilised After Light RailStrata

Kensington, 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.

Read case study
Flood-Damaged Foundation Fixed in a DayHomeowner

Kingsgrove, 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.

Read case study
Sinking Corner Lifted 10mm and StabilisedHomeowner

Mawson, 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.

Read case study
Hidden Tree Roots Behind Foundation DamageHomeowner

Balnarring 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.

Read case study
Auction-Ready After a 25mm Foundation LiftHomeowner

Murrumbateman, 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.

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Brick Veranda Realigned to Save the RoofHomeowner

Mays 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.

Read case study
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.

Buildfix structural engineer with client discussing foundation repair

Ready to get your foundation fixed?

Get your home’s levels measured and the cause identified. It’s free. Takes 30–60 minutes. You’ll know exactly what’s going on.

Structural Engineers · Licensed Builders · Skilled Technicians