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01376 31125 info@4sp.group

Professional Piling Contractor

As an accredited piling contractor in London, we provide safe, efficient, and fully compliant piling solutions for projects of all sizes. With access to a wide range of piling rigs and techniques, we can tailor our approach to suit restricted sites, challenging ground conditions, and complex structural requirements.

Our piling team delivers reliable results from the outset, ensuring a stable foundation for the structural works that follow. If you’d like to discuss your project, our piling specialists are on hand to provide guidance and support.

4SP are experienced piling contractors in London, equipped with an extensive range of piling rigs to suit a wide variety of project requirements. By selecting the correct rig and piling technique for each site, we’re able to mobilise quickly and keep your project moving toward the next phase without delay.

We thrive on the types of projects that other piling contractors may walk away from, specialising in restricted‑access piling with rigs ranging from 1.5 t to 15 t. This allows us to operate safely and efficiently in tight, constrained, or sensitive environments.

We install piles from 150 mm to 750 mm in diameter, covering a full spectrum of residential and commercial applications. In addition to piling, we also construct ground beams and capping beams, linking the piles to create a stable platform for basement construction and the structural works that follow.

Onsite Piling by 4SP Group
Open Bore Piling

Experienced Piling Contractors

We are always on hand to provide clear, practical advice on the piling solutions best suited to your project, including whether ground beams or capping beams will be required to complete the foundation system.

We are happy to install the full foundation package or just the piling, depending on what your project requires. We can manage our own attendance on site or work seamlessly alongside your existing team.

If you’d like more information about our accredited piling contractor services, or you’re looking to obtain a quote for your project, our construction specialists are ready to help.

 

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The Piling Services We Offer

Mini Piling

Mini Piling
CFA Piling

CFA Piling
Open Bore Piling

Open Bore Piling

Below Ground Retaining Walls

This method is typically used on sites where groundwater is not a concern. Retaining walls are formed by installing a series of piles in close proximity, positioned so they almost touch, with a gap of around 100 mm between each pile. This creates a robust retaining structure capable of supporting basement excavation and below‑ground works.

These embedded piles form structurally sound walls that provide stability throughout the excavation process. There are two main systems used to create below‑ground retaining walls:

  • Contiguous bored pile walls
  • Secant bored pile walls

Both systems offer reliable solutions depending on ground conditions, water ingress risk, and the structural requirements of the project.

 

Secant Piling

Secant piled walls are formed by installing bored piles so that each pile overlaps the next in a male‑and‑female sequence. This overlapping arrangement creates a continuous wall, and when constructed using hard/soft or hard/hard pile combinations, the secant piling technique provides an effective watertight barrier against groundwater ingress.

Contiguous Pile Walls

Contiguous pile walls are formed by installing a series of bored piles side‑by‑side with small gaps between each pile. This method is typically used on sites where groundwater is not a significant issue, providing a cost‑effective retaining solution for basement excavations and other below‑ground works.

The piles are installed close enough to create a stable retaining structure while allowing for controlled excavation behind the wall. Contiguous walls offer flexibility in a wide range of soil conditions and are well suited to urban environments where vibration and noise must be kept to a minimum

Cased Piles

Cased piling involves the use of temporary steel casings to create a watertight seal through wet or unstable ground, allowing drilling to continue safely down to a stable clay strata before progressing to the required depth. This method provides excellent control in challenging ground conditions.

The benefits of cased piles include reduced over‑break, lower concrete consumption, a clean and open pile bore for easier inspection, and the ability to achieve greater depths with improved accuracy.

CFA Piling

Continuous Flight Auger (CFA) piling is a versatile, low‑vibration piling method ideal for sites with restricted access, noise limitations, or sensitive surrounding structures. The process involves drilling to the required depth using a hollow‑stem auger, then pumping concrete through the auger as it is withdrawn, creating a continuous pile shaft without leaving the bore open at any stage.

This technique offers excellent control in loose or water‑bearing soils, as the auger supports the ground throughout the drilling process. The benefits of CFA piles include fast installation, minimal noise and vibration, reduced risk of bore collapse, and consistent pile quality — making it a reliable solution for both residential and commercial foundations.

SFA Piling

Sectional Flight Auger (SFA) piling is a specialist technique designed for sites with restricted headroom or limited access where traditional CFA rigs cannot operate. The system uses short, sectional auger flights that are added and removed as drilling progresses, allowing piles to be installed safely in confined spaces such as basements, undercrofts, and tight urban sites.

Concrete is pumped through the hollow stem of the auger as it is withdrawn, forming a continuous pile shaft while maintaining ground support throughout the process. The benefits of SFA piling include low vibration, minimal noise, suitability for low‑headroom environments, and reliable performance in a wide range of soil conditions.

Driven Piles

Driven piles are a highly reliable foundation solution where piles are installed by driving pre‑formed sections into the ground using hydraulic hammers or vibration equipment.

This method provides immediate load‑bearing capacity, as the pile is compacted tightly into the surrounding soil, creating a strong and stable foundation without the need for wet concrete processes.

Driven piling is particularly effective in granular soils, areas with high groundwater, or sites where speed and efficiency are essential. The benefits of driven piles include rapid installation, excellent quality control, predictable performance, and minimal spoil removal — making them a clean and efficient option for a wide range of structural applications.

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