The Firma Stay

Underpinning, without the upheaval

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.

Ground-level view of a steel underpinning bracket with a hydraulic bottle jack installed in an excavated pit against a brick wall foundation, next to a utility gas meter.

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.

High-angle view of a house restumping and foundation repair site, showing a multi-port hydraulic manifold connected via red hoses to lifting jacks placed in excavated pits beneath a brick house wall.

Why it works

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.

Interior construction view showing a machinery arm with a hydraulic drive driving a steel foundation screw pier into the ground through open floor joists, inside a partially renovated wooden house structure featuring leadlight windows.

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.

Low-angle view under a building structure showing a blue steel screw pile attached to a heavy galvanized support bracket, supporting the structural steel floor joists above an unpaved crawl space.

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