Although it would be a long way off and something that I wouldn't attempt myself I was wondering if it was a huge project to strengthen a flat roof to make it suitable as a balcony? I live in a terraced house with the kitchen and bathroom as a single story extension on the rear of the property with the flat roof. Being a terraced house there is limited space outside the property and thought this would be idea. Any tips as to if this is possible, what is involved and would it be a huge & expensive project would be gratefully recieved.