When Foundation Problems Persist After Traditional Underpinning in an Australian Home

Several years ago, the owners of this home purchased it knowing foundation issues were present, securing a reduced price to fund the necessary foundation repair. A thorough home inspection and structural assessment had confirmed signs of settlement and cracks in walls, likely caused by shifting soil conditions beneath the concrete foundations. They opted for traditional concrete underpinning solutions, believing it would be the ultimate solution.

The process was arduous, involving months of work, geotechnical and structural engineers, council approvals, and certifications. When it was finally complete, the owners hoped their ordeal was over, ready to transform the house into their dream home. For a few years, everything seemed fine—until they decided to install new windows.

Fixing a Shifting House Without Damaging Windows or Floors

The severity of the foundation issues became undeniable when the window fitter struggled to find a single level, square opening—clear signs of foundation problems. The uneven floors and misaligned frames hinted at structural issues far beyond aesthetics. By the time the custom windows were ready, the shifting ground had already altered the measurements, forcing the fitter to modify them on-site.

The extent of damage revealed flaws in the earlier approach. Despite the cost of the previous foundation repair services, house subsidence continued, risking further damage to the structure and new fittings. The homeowners feared the worst—possible failure of footings, hidden erosion control issues, or even compromised water pipes. They needed a modern solution.

Buildfix was called in not only for our track record with successful projects but also for our ability to deliver precise residential solutions without major excavation. The challenge was to re-stabilise the building using advanced techniques and Australian resin—without disturbing the windows, walls, or causing disruption typical of older construction methods.

Non-Invasive Resin Injection Services by Underpinning Experts

To meet this challenge, we used our advanced GeoPoly™ resin injection system with deep-lift technology—a trusted approach in Australian ground engineering. The process began by addressing the core issue: the failed concrete underpinning. Our team carefully drilled through the surface concrete slabs and beneath each concrete underpin, injecting resin to underseal the bases and eliminate voids, a critical step in preventing further structural issues.

We then carried out precision deep injections to compact the soil and lift the foundation gradually. This method avoided major excavation and preserved the home’s structural integrity, which traditional methods—like older chemical underpinners—often compromise. GeoPoly™’s Time-Delayed-Reaction (TDR) technology gave us millimetre-level control, allowing us to restore stability without damaging finishes like brickwork or disturbing internal fittings.

Cost-Effective Foundation Repair With Lasting Results

What once seemed like an impossible problem was resolved in a single day. The homeowner, who had feared further structural damage and another costly ordeal, was relieved to avoid another round of foundation repair costs or disruptive sink hole remediation.

Following Buildfix’s intervention, the home passed a follow-up building inspection, confirming restored integrity and structural stability. The windows remained flawless, and there were no signs of movement post-injection—a result that surpassed the homeowner’s expectations.

Seeing similar signs of subsidence in your home? A free assessment takes the guesswork out of it — find out exactly what's happening beneath your foundation and what underpinning can do.