Structural Steelwork
Primary and secondary structural steelwork to BS EN 1090 Execution Class 2 - from 50kg lintels to 40-tonne+ walkways, designed, fabricated, and erected by one accountable team.
What we deliver.
Structural steelwork only works when the detailing, the fabrication, and the erection share a drawing. We keep all three coordinated in-house - ~100 tonnes a month through our Rotherham facility, erected by our own CSCS-carded crews with lift plans written by our in-house Appointed Person rather than outsourced to the crane-hire contact.
Primary frames, secondary steelwork, mezzanines, plant decks, stair cores, walkways, portal frames, and refurbishment packages - across commercial, industrial, and high-end residential. BS EN 1090 Execution Class 2 as the fabrication standard, welders individually qualified to BS EN ISO 9606, UKCA-marked documentation and a 12-month defect liability period as the handover baseline. As an example, the 40-tonne walkway we lifted into a tight-access Leeds site by tower crane was a standout project that we're really proud of.
What we make.
Every project follows the same certified workflow - so you get the same outcome whether we're making one beam or a thousand.
Full structural package - primary and secondary
UB and UC primary frames, bracing, columns, purlins and rails, edge protection, plant decks, stair cores, and mezzanine steelwork. Fabricated to BS EN 1090 Execution Class 2 under Factory Production Control, welded by coded welders qualified to BS EN ISO 9606, and erected by our site crew.
In-house lift planning
Lifting plans are written in-house, by someone who knows how things actually work on the ground - the same team who planned the 40-tonne tower-crane lift in Leeds through access that made mobile craneage very difficult.
Tekla, BIM, and 3D-scan on retrofit
Tekla modelling, BIM coordination at LOD 300+, FEA where specified, and 3D site scanning on retrofit packages - the mezzanine floor at JPM Chantry House and the access stairway at Thermo Fisher Horsham both started with a scan of the structure as-built. Drawings match the building you have, not the building the original drawings describe.
Sector breadth on record
Tier-1 commercial (120m Level 9 walkway at 3 Chamberlain Square Birmingham for Sir Robert McAlpine), live retail refurbishment (night-shift plant deck at Oban), live leisure (200m steel balustrade and handrails at Hollywood Bowl Reading), research and laboratory (Thermo Fisher Horsham), and reclaimed structural steel (London CHS package).
Craftsmanship. Accountability. No shortcuts.
No subcontracted welders. No outsourced site crews. Every project from 3D model to final torque-check is handled by a certified UIS team from our Rotherham facility.
Tour our workshop
Project & sample images.
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Four reasons we stay on your shortlist.
The same four reasons come up whether you're a tier-one contractor, architect or self-builder.
About UIS-
01
Accreditations & compliance
BS EN 1090 Execution Class 2. CHAS Elite, Alcumus SafeContractor, ISO 9001. Every project ships with a full QA pack.
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02
Experience & capabilities
Thirty years in business. Drawing board to torque-check happens in-house - no split accountability.
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03
People & values
CSCS operatives. Coded welders. Chartered draughtsmen. A family firm that treats your project like their own.
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04
Innovation & sustainability
Tekla 3D modelling. Automated welding cells. GRP composite solutions where steel isn't the right answer.
"I've worked with UIS for several years on some high profile and very complex projects. Their attitude and work ethic are second to none - providing high quality services and products which are delivered safely and on time every time. Overall they are a pleasure to do business with and wouldn't hesitate recommending UIS for any steelwork or metalwork packages."
Questions clients ask us.
No, not in the vast majority of cases. Our detailed itemised quotations at tender stage - material take-off, fabrication assumptions, lifting allowances, and installation programme - helps us accurately get budget estimates right. What we quote is what you pay, with variations only where scope/circumstances genuinely change.
We are fully certified and manufacture + install up to British standards, including: BS EN 1090 Execution Class 2, UKCA marking, welders individually qualified to BS EN ISO 9606, ISO 9001 quality management.
Yes - 30 years of projects include technically demanding packages such as the bearing-guided rotating shelving at the Botree Hotel (described by the client as an industry-first), the 40-tonne Leeds walkway lifted through tight access by tower crane, and reclaimed CHS steelwork on a central London project. Our track record covers both complex and straightforward work.
Design, fabrication, and erection under one roof removes the coordination delays that slow most structural packages. Prefabrication-first production in our Rotherham workshop, JIT delivery scheduled against your site access window, and our experienced crews mobilising from the same base that priced the job. Tight programmes are planned in at briefing, not squeezed at handover.
Recent project deep-dives.
Reclaimed Structural Steelwork Project London November 2025
Our mild steel workshop has been busy this week fabricating and welding the structural steelwork for a unique project we have on down in Lon...
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Stainless Steel Powder Coated Handrails with LED Lighting December 2025
Another successful project completed and handed over! ✅ 😘 Our client requested ourselves to supply and install the stainless steel p...
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Large Steel Construction and Erection Project London December 2025
We are proud to share that our team has successfully completed and installed another high-quality steelwork package right in the heart of Lo...
Read case study →Structural Steelwork across the UK.
We design, fabricate and install UK-wide. Explore our local coverage below.