The Firma Stay

The problem with traditional underpinning
Settlement and subsidence repairs usually mean extensive excavation, formwork, reinforcement and a concrete cure — weeks of disruption before a home or building is stable again.

The Firma Stay, by FTA
A screw-piled underpinning system that repairs, strengthens and stabilises settling structures — installed with compact equipment, and load-bearing immediately.

Why it works
Installation torque confirms capacity in real time — measurable performance, not a guess based on excavation conditions.
Minimal excavation, no spoil removal, reduced vibration and noise — the difference between a difficult few days and a disruptive few weeks.
Piles extend beyond problem soils into competent bearing strata, engineered to stop ongoing settlement rather than just patch the symptom.
Where it’s used
Residential restumping and settlement repair, commercial and heritage building stabilisation, and structures where continued occupation during the repair matters, such as schools, hospitals, and heritage buildings.

What drives the cost
Every underpinning job is priced on the site, not on a rate card. Four things do most of the work in moving the number up or down.
- Site access — tight or restricted sites take longer than a clear, open one.
- Soil conditions — reactive or disturbed soil may need deeper piles.
- Extent of settlement — wider movement means more piles and engineering time.
- Pile count — follows from the above; more piles, more thorough fix.
We assess your site first, then price the fix that matches what’s actually happening underneath your home/building — not a one-size-fits-all figure.

Related articles
House restumping: what’s involved and what changes the cost
Screw pile underpinning cost, compared
What drives the cost of underpinning in Melbourne
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