RADIX EXT Screw Piles

Engineered for Depth, Strength, and Reliability. Our extendable screw pile range delivers rapid installation, precision accuracy, and proven long-term performance. Designed for projects that demand deeper foundations than standard ground screws, they provide exceptional structural support in challenging soil conditions.

What is an Extendable Screw Pile and How Do They Perform?

Manufactured to the highest standards and available worldwide, RADIX Extendable Screw Piles are trusted by piling companies, contractors, and engineers across the globe. Whether you require supply-only or a complete installation service, we ensure every pile meets your specification, backed by our technical expertise and commitment to quality.

Extendable screw piles are built for projects where standard ground screw lengths aren’t enough. Using a modular design, additional extension pieces can be connected to the lead section during installation, enabling the pile to reach greater depths until the required load-bearing strata is achieved.

This adaptability makes them ideal for challenging ground conditions, variable soil profiles, or sites with higher load requirements. Just like our ground screws, they are installed quickly with minimal site disruption, but with the added capability to go deeper for enhanced stability and performance. Our V4 89mm Ext Screw Piles are designed and engineered to axial load bearing capacities of 200kN ULS.

By combining precision manufacturing with advanced installation techniques, RADIX ensures every extendable pile achieves accurate alignment, optimum torque, and the load capacity your project demands.

RADIX Ext Screw Piles are manufactured in accordance with EN1090-2 Factory Production Control and are fully CE compliant. Engineers structural analysis reports are available on request.

Our EXT Screw Pile Range

A Screw Pile for Every Project

With strategically located depots across the UK, and an established global supply network, RADIX maintains high stock levels of our V4-89mm and V4-76mm extendable screw pile ranges. This ensures we can respond quickly to your project needs, wherever you are in the world.

Our expert team works with you to identify the most suitable screw foundation for your specific ground conditions, load requirements, and installation environment. From supply-only orders for piling companies to full design, testing, and installation packages for contractors and engineers, we provide a seamless service from concept to completion.

No matter the time pressures, ground challenges, or technical demands of your project, RADIX delivers the right solution – on schedule, on specification, and to the highest standard.

Whether you are supporting Battery Energy Storage Systems, Bridges or Modular Buildings we have experience across the globe. If our Screw Piles don’t meet your project specification check out our Helical Piles offers.

RADIX EXT V4-76mm Screw Pile

Screw Tip Lengths (mm):
2200

Extension Lengths (mm):
1000, 2000

Helical Extension Lengths (mm):
680

Anchor/Fixings:
220mm flange, with M24 captive nut

RADIX EXT V4-89mm Screw Pile

Screw Tip Lengths (mm):
2200

Extension Lengths (mm):
1000, 2000

Helical Extension Lengths (mm):
680

Anchor/Fixings:
220mm flange, with M24 captive nut

Our EXT Screw Pile Range

A Screw Pile for Every Project

No matter the time pressures, ground challenges, or technical demands of your project, RADIX delivers the right solution – on schedule, on specification, and to the highest standard.

RADIX EXT 76mm Ground Screw

Screw Tip Lengths (mm):
1250, 1550

Extension Lengths (mm):
900, 1400, 1900

Anchor/Fixings:
200mm flange, with M16 captive nut

RADIX EXT 89mm Ground Screw

Screw Tip Lengths (mm):
2200

Extension Lengths (mm):
1000, 2000

Helical Extension Lengths (mm):
680

Features & Benefits of RADIX Extendable Screw Piles

Our low-carbon foundations are installed quickly, reducing labour costs and making your project more cost-efficient. With our range of screws, you have instant load-bearing capacity, so no waiting about for concrete to dry!

There are several advantages of ground screws and screw piles, here are a few:

Extension shafts can be added during installation, enabling deeper penetration to reach the required load-bearing strata — perfect for variable or challenging ground conditions.

Installed using specialist equipment with minimal excavation, noise, or vibration — reducing site disruption and environmental impact.

Manufactured to exacting tolerances to ensure accurate alignment, optimum torque, and reliable load capacity every time.

Suitable for temporary or permanent works, from small-scale structures to heavy-duty commercial and infrastructure projects.

High stock availability in UK depots and an established international logistics network for fast, reliable delivery worldwide.

From initial ground testing and design calculations to on-site installation and training for your crews, we offer tailored support at every stage.

Built from high-grade steel with specialist coatings for superior corrosion resistance and lasting performance in diverse soil conditions.

Applications

RADIX extendable screw piles are the foundation of choice for projects that demand deeper installation than standard ground screws, higher load capacity, or performance in variable ground conditions. Their adaptability and speed of installation make them ideal for a wide range of sectors, including:

Renewable Energy – Battery Energy Storage Systems (BESS), Ground Mount Solar Arrays and Micro Wind Turbines and Solar Carports
Infrastructure Projects – Pedestrian Bridges, Walkways, Platforms, and Retaining Structures.
Transport & Rail – Signage, Gantries, Barriers, and Trackside Structures.
Temporary Works – Event Structures, Modular Buildings, and Site Construction Compounds
Marine & Coastal – Pontoons, Jetties, Boardwalks, and Raised Platforms.
Housing – Modular and Prefab Home Extensions
Leisure & Tourism – Luxury Lodges, Holiday Cabins, Glamping Pods and Bothies

Whether your project is in the UK or anywhere in the world, RADIX extendable screw piles deliver the depth, strength, and reliability needed to meet your specifications, on time and on budget.

Tested, Proven, and Guaranteed

At RADIX, our screw piles undergo rigorous testing and quality control to ensure it meets our exacting standards for strength, resilience, and performance. We verify our screw pile’s technical specification, durability, and load-bearing capacity, giving you complete confidence in its long-term reliability.

If you need empirical data, load test results, or detailed technical documentation for any of our products, our team can provide it promptly.

As the UK’s largest stockist and supplier of extendable screw pile foundations, and with an experienced network of installers nationwide and an established international distribution network, RADIX offers not only the widest availability but also the highest calibre of product on the market. Wherever your project is located, we deliver the foundations you can trust.

A turnkey service for screw pile foundations for commercial and private projects

Throughout every phase of your project—from initial engagement, through meticulous design and planning, to comprehensive site surveys, ground testing, and installations—our approach is defined by clear communication, transparency, and consummate professionalism.

Leveraging the specialised skills of our certified installers and utilising state-of-the-art machinery and equipment, we efficiently collect and analyse the essential data for your project. This strategic process ensures the successful completion of your project, both on schedule and within your budget.

Our installers are available for any private or commercial projects. From a jetty or wharf on a river bank to a battery energy storage system (BESS), or a passive house in the countryside, our helical pile foundations will stand the test of time.

Ground screws and screw piles | Load testing equipment

Site Surveys & Load Testing

We can provide the empirical data on which ground screws and screw piles are specified for your project.

Ground screws and screw piles | Project design and planning

Project Design & Planning

Our experienced team can help design the foundations and structural base to meet your project specifications.

Screw foundations | Professional installation | RADIX

Professional Installations

Our experienced installation teams are ready to help you with any type of project, anywhere in the country.

Meet the team and machines we use to install our screw pile foundations

Screw piling is typically required when we need to go deeper into the ground, we have sloped land, and the load capacity of the structure demands a deeper, stronger and extendable screw. Our teams and machines that we use for screw piling are second to none.

Solar farms, battery energy storage systems, foundations for houses, SIP buildings, house extensions, log cabins… The list goes on!

Extendable Screw Pile Costs

We need to analyse your project to be able to generate an exact quote for you, as many factors will determine which foundation screw is best suited for your project. This includes taking into consideration total load capacities and your site’s ground conditions.

At RADIX, we don’t believe in one-size-fits-all pricing. Every project has unique demands, which is why we provide tailored recommendations based on detailed project information, site surveys, and engineering calculations. This ensures you get the most cost-effective solution without compromising on performance, safety, or longevity.

Why Not Choose Purely on Price?

While cheaper alternatives may seem appealing initially, they often lack the steel quality, protective coatings, and engineering precision needed for long-term reliability, especially in deeper or more challenging installations. Choosing purely on cost can lead to higher maintenance expenses, reduced service life, and, in the worst cases, structural failure.

At RADIX, we focus on delivering true lifetime value – with extendable screw piles designed, tested, and manufactured to perform for decades, no matter where in the world your project is located.

Are there other types of piles similar to our helical piles used in construction?

There are many different types of piling systems used in construction. RADIX Helical Screw Piles should not be confused with traditional pile systems that most people are familiar with. Our helical screw piles are a uniquely designed hybrid system, value-engineered to deliver a more cost-effective solution for large-scale and heavy structures. Traditional piles are not only more expensive, but require a different method of installation which can include boring or driving piles in by impact, which requires heavy machinery and large piling mats.

Other types of piles used in construction include; CFA Piles (Continuous Flight Auger Piles), Sheet Piles, Micro Piles (or Mini Piles), Helical Piles, Bored Piles (or Drilled Shafts), Driven Piles, Caisson Piles, Composite Piles, Prestressed Concrete Piles, Timber Piles, Tension Piles and even more.

Screw pile FAQ

Below you will find some of the questions customers have asked us about our screw pile foundations, our screw piling installations, and other services we offer. If you cannot find the answer to your question, then please contact us, and we’ll be happy to help.

What is the load capacity of a screw pile?

The load capacity of a screw pile is dependant on several factors, including the ground conditions for frictional load, or achieving the depth for a point load and the structural integrity of our foundations.

Our expert teams have installed to depths of 16m before, supporting 200kN per screw pile for a bridge construction project.

How deep do screw-piles go?

Our foundations can go as deep as required. We have done installations nearing 20m deep.

What is the difference between a helical screw pile and a ground screw?

A ground screw is a set length, whereas a helical screw pile can be extended to reach the depths required to optimise the stability of the above structure. A pile differs from a ground screw by the helical blade that is added to the screw tip part of the pile, this increases the load capacity, strength and support of the device. Both can support large structures, but the ground, weight dispersement and the structure’s load are all taken into consideration when choosing which screw is better to use.

A helical pile and a ground screw, while similar in function and appearance, have some differences:

Design and Application:

Helical Screw Pile: Traditionally larger and longer, screw piles are designed for deep foundations. They are often used in heavy construction, like supporting houses, bridges, battery energy storage systems, ground-mounted solar panels.
Ground Screw: Generally smaller (our maximum length is 2100mm), ground screws are suited for applications such as securing decks, fences, garden rooms and smaller solar arrays, but it is the ground conditions and load that determine which is used.

Load-Bearing Capacity:

Helical Screw Pile: They have a higher load-bearing capacity due to their size and depth, making them suitable for supporting substantial structures.
Ground Screw: While highly effective, they are typically used for lighter loads when we make a decision.

Installation:

Helical Screw Pile: Their installation might require our larger installation machinery due to their size and the depth they need to reach.
Ground Screw: These can often be installed with our portable ground screw machines

Cost and Efficiency:

Helical Screw Pile: The cost might be higher due to the materials and installation process, but they provide robust support for larger projects.
Ground Screw: More cost-effective for smaller-scale projects, offering quicker and easier installation.

Both serve the purpose of providing stable foundations but are chosen based on the scale and requirements of the project.

What is a pile?

A pile is a long, slender column made of strong materials like wood, steel, or concrete, which is driven deep into the ground to provide foundational support for various types of structures. Piles are used in construction when the surface soil’s load-bearing capacity is insufficient to support the weight of the building. They transfer the load from the structure above to the stronger, more stable soil or rock layers deep below the surface. Piles are essential in supporting bridges, buildings, and other structures, especially in areas with weak or unstable soil.

RADIX Screw Piles replace the need and expense of traditional piles in many cases, subject to project requirements and ground conditions.

Are screw piles expensive?

Screw piles can be a smarter and more cost-effective solution to concrete and traditional piles in many cases. The actual cost of a helical screw pile is determined by the size and length of pile you need for your particular project. To find an exact answer of the price, contact us to evaluate your project and generate a quote for you.

What type of machines do we use for screw piling?

We use a variety of machines for screw piling depending on the demands of the project. We can install hundreds of screws per day with our team and multiple machines, which help speed up the project’s timeline. Have a look at our screw piling machines.

* A RADIX Screw Pile must be selected based on static calculations and results of site-specific ground testing. The manufacturer is not liable for damage caused by insufficient or incorrect selection of screw pile foundations.

Ready to Talk Foundations?

Whether you’re a piling contractor looking for a dependable supply partner, or a project engineer seeking a complete design-to-installation solution, RADIX is ready to deliver.

Our extendable screw piles are engineered for performance, stocked for immediate dispatch, and supported by a team with decades of foundation expertise. From the UK to across the globe, we make sure your project has the depth, strength, and reliability it needs.