Steel size, educated guess?

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I've just got a lawfull development certificate for a 12x7.5m garage outbuilding. I've got to build it below 2.5m, well I got a little more as the ground at the rear will be approx 300mm higher. Now I know i should be getting building regs but I'm just deciding on the layout first. Would anyone care to give an educated guess on a steel size I may require. I plan to divide the internal 11.5m width with a block wall leaving a garage area approx 7m deep by 9m wide. I then plan to install a 9m steel down the centre, then roofing joist from the centre 3.5m to the front and back walls, these will be fitted so they create the fall for an obs roof which will then be grp or rubber, not yet decided. What sort of steel am I looking at for this?

My other option if I want an open garage is to steel twice front to back, then joist between the steels at approx 3.8m intervals, I guess this may allow a smaller steel?
 
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The problem with these rules of thumb is you end up with something like a 390 beam for a 7.8m span - where a couple of (e.g.) 210s might be better.
 
Was going to say we got beams that big in the local asda multistory car park.
 
The problem with these rules of thumb is you end up with something like a 390 beam for a 7.8m span - where a couple of (e.g.) 210s might be better.
So if you were drawing an extension for planning and it necessitated considering the size of a beam for a 9m opening, what would draw on the drawing? Are you saying you would engage a structural engineer to work it out for you?
 
Just found easijoist and they can possibly according to there span tables do a flat roof span of 7m which would be front to back with a 219mm joist. This would mean no steel needed and I guess the joist could be set at an angle for the run off. Not sure on costs of these though.
 

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