Steel Beam Calculation for Roof

Job ID: 39644463

Budget: £20 – £250 GBP

I am based in the UK and I had a small steel beam extension installed, extending from ~3m to ~4m in length. The beam supports a flat roof only and skylight with no structure above. I need the calculations to confirm the bearing loads is ok. I am confident that it is, but I need the calculations to go with it.
I also need calculations for similar extensions to 3 matching wooden joists.
Looking for someone familiar with UK approach to buildings.

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