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The reference photo looks to be in the UK (maybe, could be) - google image search its origin and contact the architect/owner? I've done it before and been surprised at the response/success rate
A glazier can give you a sqm glass cost based on requirements/location - they should also be able to ballpark frames and labour, then you'd need to factor in the opening up and new lintel if going into existing fabric... do you have an architect?
I'd contact local glaziers and send them this picture with approximate dimensions you have in mind to get a quote - or ask your contractor to get some prices...