Building the UK’s Infrastructure as experts in Engineered Steel Structures and Screw Pile Foundations

FLI Structures designs, fabricates and installs fully engineered steel structures, screw piles (also known as a helical piles) and steel grillage foundation systems for the UK’s critical infrastructure. Its capability is built on more than 70 years of experience and a complete in-house team that includes chartered engineers, a specialist drawing office, and fully qualified steel welders and fabricators operating from modern facilities across two sites in Gloucester. This integrated approach provides full control of structural design, analysis, detailing, fabrication and installation.

FLI designs and manufactures a wide range of steel structures, including lattice towers, guyed masts, monopoles, signal gantries, railway platforms, bridges and bespoke support systems. Its telecoms towers support every major mobile network operator, alongside a broad range of national infrastructure clients across the telecoms, rail, highways, energy, radar, bridges and water sectors. FLI also delivers tower strengthening solutions to extend the service life and capacity of existing steel towers and assets.

All structural steelwork and screw pile and steel grillage foundations are delivered to the highest standards of quality, accuracy and safety. Fabrication is carried out to Execution Class 4, supported by rigorous processes recognised through RoSPA Gold Awards and Fit for Nuclear (F4N) accreditation.

Screw Pile Foundations  
                                                                                                                                                                                                                       

Health and Safety

At FLI Structures, health and safety are central to everything the company designs, manufactures and installs.

FLI Structures is accredited to ISO 45001 and holds a RoSPA Gold Award, demonstrating an ongoing commitment to the highest safety standards across all operations.

A dedicated Health & Safety team manages a robust suite of live policies and procedures, which are continually reviewed and refined to reflect evolving legislation, client requirements and industry best practice. These standards ensure that every member of the workforce understands their role in maintaining a safe and responsible working environment.

For over a decade, FLI has championed behavioural safety programmes, recognising that proactive engagement and continuous improvement are key to preventing incidents and achieving long-term safety excellence.

QHSE Documentation

Standard Products

FLI Structures has a wide range of standard product designs that are already proven across all infrastructure sectors.

This is particularly evident within the telecoms sector, where FLI’s 70-year history was strengthened through the acquisition of Alan Dick Towers and Masts. As a result, FLI holds the master designs for more than half of the towers and masts installed across the UK.

With this extensive design library, FLI can provide off-the-shelf solutions for the majority of new build and upgrade projects, helping to reduce programme times and overall project costs.

Models and drawings for standard rail and telecoms products can be downloaded from the Resources pages.

Models and Drawings