What affects the cost of subsidence repair
The cost of subsidence repair depends on three things: how far the house has dropped, how deep the injection has to go to reach solid ground, and how much of the home is affected.
Subsidence repair is the deep lift. Where underpinning stabilises the ground just under the footings, subsidence repair injects GeoPoly™ up to three metres down, filling the voids and weak ground the house has sunk into, then lifts the foundation back to level. The deeper the weak ground runs and the further the house has dropped, the more resin and the more injection points it takes. That's why the approximate cost sits between $8,000 and $22,000.
How much of the home is affected matters just as much. One corner that's dropped is a different job to a house where three sides have sunk. Soil plays its part too — sandy ground soaks up more resin, the reactive clays of Melbourne and Western Sydney less. The free assessment measures all of it and gives you the exact number.
Most homeowners who've been quoted for traditional concrete underpinning have seen numbers between $20,000 and $100,000, and months of engineers, certifiers and builders. GeoPoly™ subsidence repair sits at a fraction of that — and it's done in 1–2 days, with you at home the whole time.