T C Rowan designs, fabricates and erects steel frame buildings across Oxfordshire and the surrounding counties, from a single-bay workshop to a multi-bay commercial or agricultural building. A steel portal frame is the most efficient way to enclose a large, column-free space, and because we are a single fabricator handling design, fabrication in our own Banbury workshop and erection by our own team, the building you are quoted is the building that goes up. This is part of our wider design and build steel building service, so the frame can be the whole job or the structural core of a full turnkey build.
What a steel frame building is
A steel frame building is a structure built around an engineered skeleton of steel columns and rafters, most commonly a portal frame: pairs of columns and rafters bolted into rigid frames, repeated in bays along the length of the building, then clad and roofed. The frame carries the loads, so the walls and roof are cladding rather than structure. That is what gives steel its defining advantage: wide clear spans with no internal columns getting in the way of how you use the space.
The same building system scales up or down. Section sizes, frame spacing, eaves height and bracing are all engineered to your span and loadings, confirmed by a structural engineer’s calculation, so a compact workshop and a large warehouse are the same approach at different sizes.
What we build
Steel frame buildings cover a broad range of uses, and we fabricate for all of them:
- Commercial and trade units for retail, light industrial, offices and mixed use
- Workshops for engineering, vehicle work, joinery and manufacturing
- Warehouses and storage buildings where clear span and eaves height matter
- Agricultural buildings including barns, livestock housing and machinery stores
- Garages and outbuildings for domestic and estate use
- Steel framed extensions where a clear-span steel structure opens up the footprint
For farm and equestrian work, our agricultural steel buildings page covers barns, livestock housing and grain stores in depth. For factory, plant and larger commercial structures, see our industrial steelwork page. A steel framed extension follows the same engineered approach at a domestic scale, with the frame sized to the opening and loadings.
Why choose a steel frame
For most commercial, industrial and agricultural buildings, a steel portal frame is the most efficient option, and the reasons are practical rather than cosmetic.
- Clear spans. Steel carries long spans without internal columns, so you get open, usable floor area, easy vehicle access and the freedom to lay out the space however the use demands.
- Speed. Once the frame is fabricated, erection is fast and predictable. A clad, weathertight building goes up far quicker than masonry of the same footprint.
- Cost efficiency. Steel uses material efficiently over large areas, which keeps the cost per square metre competitive compared with traditional construction at scale.
- Durability. A properly specified and protected steel frame has a long working life and stands up to heavy commercial and agricultural use.
- Adaptability. Frames are straightforward to extend, re-clad or reconfigure later, so the building can grow with the business.
Cost depends on the specifics of your building, and we never quote a blanket rate. Our steel frame building cost per m2 guide sets out the factors that move the price, then we give a firm figure after a survey.
Design and build, or supply only
A steel frame is rarely the whole story. A finished building also needs foundations and groundworks, cladding, roofing, doors, windows, services and fit-out. As a design and build steel contractor we can take the building from a blank site through to a finished, weathertight, fitted-out structure under one point of responsibility, or we can fabricate and erect the frame for your own contractor to clad and complete.
Either way, the structural steel comes from one firm that designed it, which is what keeps the frame from arriving wrong and stalling the rest of the build.
How the process works
Every steel frame building follows the same disciplined path, from first survey to the last bolt.
- Survey and brief. We capture real dimensions on site and confirm the use, span, height and loadings the building has to meet.
- Design and engineering. The frame is designed and section sizes are confirmed by a structural engineer’s calculation, with fabrication drawings agreed with you before any steel is cut.
- Fabrication. Columns, rafters, bracing and connections are cut, drilled, welded and finished in our own Banbury workshop.
- Erection. Our own erection team puts the frame up on prepared foundations, ties in the bracing and hands over a structure ready for cladding, or for our full turnkey finish.
Throughout, we work to BS EN 1090 execution standards, we are CE approved, and material traceability is available on request. To get your building moving, contact us for a site survey and a quote.
Frequently asked questions
What can a steel frame building be used for?
Steel portal frame buildings suit almost any clear-span use: commercial and trade units, workshops, warehouses and storage, agricultural barns and livestock buildings, garages, and larger steel framed extensions. The frame is engineered to your span, height and loadings, so the same building system covers a small workshop or a multi-bay warehouse.
Why choose a steel frame over other building methods?
Steel gives wide clear spans with no internal columns, so you get usable open floor space. It is quick to erect once fabricated, predictable on cost, durable, and easy to extend or reconfigure later. For most commercial, industrial and agricultural buildings a steel portal frame is the most efficient way to enclose a large area.
How much does a steel frame building cost?
Cost depends on size, span, height, cladding, doors, foundations and finish, so there is no single rate that fits every job. We set out the main factors and typical ranges in our steel frame building cost per m2 guide, then give you a firm price after a site survey. Contact us for a quote on your specific building.
Do you cover design, fabrication and erection, or just supply the steel?
We cover all of it. As a design and build steel contractor we handle the building from design through fabrication in our own Banbury workshop to erection by our own team, or we supply the fabricated frame for your contractor to put up. One firm from drawing to final bolt keeps the building on programme and the responsibility in one place.