Surely modifying the roof this way isn't legit?

Thanks Notch. I'm not worried about specifics, more questioning the general idea. Some think it may be possible so I'll sort out an engineer (required or not, I'd be happier with proper plans etc). S/he may say it can't be done BUT at least I'm reasonably confident that it has at least a chance of being possible and I'm not wasting £££ on a structural engineer.

A pit would be cheaper :) but doesn't fit my requirements unfortunately and wouldn't be suitable. Plus I don't fancy relocating all the bodies I've stuffed under there.
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Only a structural engineer can advise how you could possibly form a new roof structure. Prefabricated roof trusses ,even 'standard ' fink trusses. are designed for a specific situation and you should not cut out any components. There are situations like loft conversions where specialist companies have a system where they can convert trussed roofs into a room in the roof ( structural engineer designed )
Hi all,

Sorry for digging up an old thread but I am interested to hear how this ended up as I am looking to do something similar but on a smaller scale.

OP - did you end up going ahead with the plan similar to the ones the builder drew up and did you get the support of a structural engineer?

My detached garage is 11ft wide and I am only looking to modify about 3 trusses/joists to give me enough head clearance in a small section to be able to install a golf simulator.
I would like to think this could be achieved by doing something similar to what bernardgreen suggested in an earlier post which is an updated version of the OP builder's plan.
I would look to install new timbers for this to give extra strength.
Do people think this would work for what I am wanting to achieve?

If I do need to go down the SE route, what would a ball park figure for cost be if it was only the plans that were to be drawn up? Does anyone have experience of working with an SE online as in thinking this may be quicker?

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