It’s one of the most common questions we get asked at our Liverpool yard. The honest answer is that the size of a structural steel beam has to be worked out by a structural engineer for your specific project. We can’t size a beam over the phone, and neither should anyone else.
Why the size has to come from an engineer
Every job is different. The right beam depends on things like the span, what the beam is holding up and how it’s supported at each end. A structural engineer looks at all of this and calculates a beam that is safe for your building. Building control will also normally want to see the engineer’s calculations before signing off the work.
Guessing a size, or copying one from a neighbour’s job, can mean a beam that isn’t right for your building. It can also mean problems with building control later on.
What the engineer will usually ask for
- Plans or sketches of the opening or wall you want to change.
- Photos of the area, inside and out.
- What is above the opening, such as floors, walls or the roof.
- Any existing drawings from your architect or designer.
Your builder or architect can often recommend a local structural engineer if you don’t already have one.
What the size looks like on your calculations
Your engineer will give you a section size, for example 203 x 133 x 25 UB, along with the length you need. Send us that size and length exactly as written and we’ll supply the steel to match. If you’re not sure which numbers we need, just send us the calculations or drawings and we’ll pick out the details.
Once you have your size
- Send your calculations or drawings to us for a quote.
- Tell us the finish you need: raw, primed or galvanised.
- Let us know if the steel needs cutting, drilling or fabricating.
- Give us your delivery postcode, or let us know if you’ll collect.
See our guides on what to send for a fast, accurate steel quote and the role of your engineer’s drawings for more detail.
Got your engineer’s calcs? Upload them or call 0151 733 4927 and we’ll price the beam sizes they specify.