Steel-framed buildings: a straight-talking buyer's guide
A steel-framed unit can be a finished, secure building or a kit and a good-luck note. Here is what separates the two.
What a proper build includes
A steel-framed building is more than a frame. A finished unit means groundworks, a galvanised frame, cladding, roof sheeting, doors and rainwater goods — all coordinated so you end up with a secure, weathertight building rather than a collection of parts.
- Foundations and slab, or a check and reuse of an existing slab
- Galvanised steel frame, supplied and erected
- Box-profile wall and roof cladding, with insulated options
- Roller shutter and personnel doors, guttering and rooflights
Kit or built for the site
Off-the-shelf kits suit flat, open sites and standard sizes. Real sites rarely cooperate — level changes, boundaries, existing slabs and tight access all complicate things. A building designed and built around what is actually there avoids the compromises a kit forces.
Approvals and cost
New buildings usually need planning permission, and larger or commercial units need Building Regulations approval too, though agricultural and some commercial sites have permitted-development allowances. As a rough 2026 guide, simple storage units start around 60 to 100 pounds per square foot built, rising with insulation, height, doors and groundworks.
Related questions
Can you build on my existing concrete slab?
Where the slab is sound and thick enough for the frame loads, yes — we check it first. If not, pad foundations can be cut in through the slab at the frame positions.
How long does a steel-framed unit take to build?
After approvals, a typical single unit takes three to six weeks on site: groundworks first, then the frame in days, then cladding, doors and finishing.
Ready to take it further? See our steel-framed units & buildings service.