Specialist foundation support for existing structures
Underpinning is used to strengthen, stabilise or extend the support provided by an existing foundation. It may be required where ground conditions have changed, existing foundations are inadequate for proposed additional loads, or alterations to a building require the foundation system to be reconsidered.
The appropriate underpinning approach depends on the structure, existing foundation arrangement, ground conditions, access and the reason additional support is required. SPS can assess piling-based and associated foundation solutions around these constraints, with works carefully planned to limit disruption and maintain the stability of the existing structure throughout the construction process.
Existing structures
Foundation support developed around existing buildings
Load Transfer
Additional loads transferred to suitable ground
Restricted Access
Compact installation options where required
Project Specific
Solution tailored to structure and ground conditions
How Underpinning Works
Underpinning introduces additional foundation support beneath or alongside an existing structure. Depending on the project, this may involve specialist piles, reinforced foundation elements or a combination of techniques designed to transfer structural loads to more suitable ground.
Because the existing structure must remain supported throughout the works, sequencing and temporary stability are important considerations. The final solution is therefore developed around the existing foundations, proposed alterations, structural loading and available site access.
- Strengthens existing foundation systems
- Supports additional structural loads
- Suitable for refurbishment and alteration works
- Compact piling options available
- Designed around existing structural conditions
Best Suited For
Building Extension
Supporting increased or altered structural loads
Foundation Strengthening
Improving support to existing structures
Refurbishments
Foundation works during major alterations
Poor Ground
Transferring loads beyond unsuitable shallow soils
Existing Buildings
Specialist work around occupied structures
Restricted Access
Compact solutions for constrained properties
Need practical advice before you enquire?
Speak to the team for quick guidance on your piling or foundation challenge.
The Process
A clear route from initial enquiry through to quotation and project delivery
Share site details
Tell us about your site constraints & project objectives
Review service options
We compare suitable methods to outline pros & cons, as well as other considerations
Receive expert advice
Get our expert guidance on buildability, programme fit and access.
Move to quotation
We confirm next steps to support smooth delivery throughout the project’s duration
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Frequently Asked Questions
Why might a building need underpinning?
Underpinning may be considered where existing foundations require additional support, structural loads are changing or the proposed works alter the demands placed on the foundation system.
Does underpinning always involve piling?
No. Underpinning covers several possible foundation-strengthening approaches. The appropriate solution depends on the structure, existing foundations, ground conditions and project requirements.
Can underpinning be carried out where access is limited?
Potentially. Compact piling and specialist foundation equipment can provide options where conventional plant cannot access the working area.
What information is needed before underpinning can be considered?
Existing and proposed structural drawings, foundation information, ground investigation data, details of the building condition and site-access information are all useful when reviewing suitable options.