STONNA Steel Structures is a highly specialised contractor focused on delivering structural steel packages for self-storage facilities, mezzanine floors, and warehouse conversions across London and the South East.
Operating as a high-value project management and installation specialist, we bridge the gap between complex architectural designs and flawless on-site execution. We offer complete services from early-stage structural coordination and value engineering, right through to site management, steel erection, and final handover.
Our unique business model is built on agility. Rather than being constrained by the limits of a single in-house fabrication facility, we partner with a vetted network of the UK’s top structural steel fabricators.
This approach allows us to scale our capacity instantly, choose the perfect manufacturing partner for your specific project size, and focus entirely on what we do best: proactive design management, rigorous quality control, and safe, on-time installation.
Our Mission
Our mission is to be the most trusted and efficient structural steel partner for the UK’s self-storage operators and commercial developers. We aim to deliver complex steel packages, mezzanines, and structural alterations that improve buildability, reduce risk, and exceed our clients’ expectations in a safe and sustainable environment.
Our Vision
To establish STONNA as the definitive UK specialist in self-storage steel structures—known for our proactive design intelligence, unparalleled agility in delivery, and uncompromising commitment to safety and quality under one roof.
Our Values
We operate with integrity and precision — these principles guide every project we deliver.
Our Agile Supply Chain
The core of STONNA’s competitive advantage lies in our dynamic supply chain. Unlike traditional steel contractors who are limited by their own factory output, we operate an agile delivery model. We have established strong, long-term partnerships with multiple CE-marked and UKCA-compliant structural steel fabricators and specialist manufacturers across the UK.
This strategy ensures: Unlimited Capacity—we can match your project, whether a £150k mezzanine or a £1.5M storage facility, with the ideal manufacturing partner. Reduced Risk—we are never reliant on a single point of failure. Dedicated Focus—while our partners fabricate, our in-house team remains completely focused on design coordination, logistics, and site installation.
