Push piers, and the lift they promise you

What is push pier installation?

A push pier is a steel tube driven vertically into the ground by a hydraulic ram that pushes against a bracket fixed to your foundation - meaning the weight of the building is what the ram reacts against. Sections are added until the pier meets material capable of carrying the load. That reaction requirement is why the method suits heavier structures, and it is also why any lift comes from pressurising the installed piers rather than from jacking the house independently.

Signs you need push pier installation

• A masonry or full-height house with a corner or section that has settled measurably below the rest
• A settlement pattern that an elevation survey shows to be one-directional rather than seasonal back-and-forth
• Exterior stair-step separation in brickwork concentrated toward one end of a wall
• A foundation wall where the top has dropped relative to the framing, leaving gaps under the sill or at the header
• An engineer's report calling for underpinning to competent bearing beneath a building with substantial dead load
• Settlement continuing after drainage and any water source has already been corrected
• A previous repair attempt at shallower depth that has since moved again

Seeing something not on this list? Browse foundation repair problems by symptom →

How push pier installation actually works

1. 1

   Check that the structure can serve as reaction

   The hydraulic ram pushes the pier down by pushing up against the building. If the structure above the bracket does not weigh enough, the house starts to move before the pier reaches competent material and the installation cannot develop the resistance it needs.

   Watch forThe method being proposed for a porch, a deck, a sunroom or a light single-storey addition. Those are the classic cases where reaction runs out - helical piers exist largely because of this constraint.

2. 2

   Assess the footing that will carry the bracket

   The bracket clamps to the foundation and everything passes through that connection. Excavation exposes the footing so its size, condition and reinforcement can be judged before anything is loaded through it.

   Watch forBrackets fitted to spalling, undersized or previously repaired concrete without comment. The pier can be perfect and the connection can still be the weak point, and it is buried again within hours.

3. 3

   Drive the pier, watching resistance build

   Sections are pushed in sequence and the hydraulic pressure required to advance them is monitored. Rising pressure that holds indicates the pier is entering material with capacity, which is what the installation is chasing.

   Watch forRefusal on an obstruction being read as reaching bearing. Old debris, a buried foundation or a cobble layer can stop a pier convincingly at a depth that will not hold under sustained load. Ask how the crew distinguishes the two, and what they do when it happens.

4. 4

   Decide, in writing, between stabilisation and lift

   Stabilisation transfers the load to the pier at the building's current position and aims to stop further movement. Lift attempts to recover some of what was lost by pressurising the piers to raise the structure. These are different objectives, with different risks and different definitions of success.

   Watch forA contract that says "lift to maximum practical recovery" or similar. That phrase means whatever the crew decides on the day, and it leaves you with no basis to say the outcome fell short.

5. 5

   If lifting, do it across the piers together and slowly

   Lift is applied progressively across the pier group rather than driven hard at one location, because a building raised unevenly is being distorted rather than restored. Progress is monitored against the elevation survey as it happens.

   Watch forFast lift at one corner to produce a visible result. It closes a gap somewhere and opens a new one elsewhere, and the second one appears after the crew has gone.

6. 6

   Expect the building to object to being moved back

   Everything above has spent years accommodating the settled position. Raising it can reopen previously closed cracks, disturb rigid supply and drain connections, and change how doors and windows sit. That is inherent to lifting, not to bad workmanship - the full inventory is on the foundation leveling page.

   Watch forBeing told lift carries no risk to finishes. It always carries some. What varies is how much, and whether anyone told you beforehand.

7. 7

   Lock off, backfill and reinstate

   Once the target is met, the connection is secured so the load stays on the piers, excavations are backfilled and compacted, and disturbed surfaces are made good.

   Watch forBackfill dumped loose into deep excavations. It settles into a trench along the wall that channels surface water toward the foundation - undoing the drainage that keeps the repair from being tested again.

8. 8

   Close out with measurements and a location record

   A repeat elevation survey documents what was actually achieved against the agreed target, and a layout drawing records where each pier sits. Both belong in your file with the contract.

   Watch forA verbal "we got most of it back". Without a closing survey, the difference between the target and the result is a matter of opinion, and opinion is not something a warranty responds to.

What does push pier installation cost?

Driven pier work is generally priced per pier plus mobilisation, so the specified count and the depth reached dominate the total. Attempting lift rather than stabilising adds monitoring time on site, and repairing finishes disturbed by that lift is usually a separate cost.

See the full push pier installation cost guide - by material, size and region →

If the number is the problem, here are the ways people pay for it →