Underpinning Contractors
Underpinning is used to strengthen, deepen or replace inadequate foundation support. We offer different underpinning methods, including traditional underpinning, driven piled underpinning and screw pile underpinning.
What is underpinning?
Underpinning transfers the load of an existing structure to a stronger or deeper support. It may be required where foundations are too shallow, ground conditions are poor, subsidence has occurred, or building control or an engineer has requested a designed remedial solution.
Underpinning methods we offer
Traditional underpinning
Controlled excavation in sections below an existing wall or foundation, followed by concrete placement to deepen or strengthen the foundation.
Traditional underpinningDriven piled underpinning
Steel cased piles are driven to suitable resistance and linked to the existing structure using reinforced concrete, cages, brackets or beams.
Driven piled underpinningScrew pile underpinning
Screw piles may be used on selected projects where the ground, loads and access make this method suitable.
Screw pile underpinningChoosing the correct method
There is no single underpinning method that suits every project. A shallow, accessible foundation may suit traditional underpinning. A deeper or less predictable site may need piled underpinning. A restricted-access project may be reviewed for screw piles or mini piling.
| Method | Often considered when | Key limitation |
|---|---|---|
| Traditional underpinning | Excavation is safe and required depths are manageable. | Can become impractical where depths are excessive or ground is unstable. |
| Driven piled underpinning | Loads need transferring to deeper, stronger ground. | Requires access for piling equipment and engineer design. |
| Screw pile underpinning | Low-vibration or restricted-access solution is required. | Depends heavily on ground conditions and obstructions. |
Information needed before pricing
- Site address and access photos
- Photos of the affected foundation or wall
- Engineer drawings or calculations, if available
- Trial hole depths and ground information
- Building control, insurer or surveyor requirements