Would imagine that the back has more glass so it is hard to tell and im trad so not the best at WFP stuff.
However if you take a standardisded approach to it i.e this much for a window on that floor this much for a door. Then quoting will be easier and if you dont get it you can say well I dont work for less than that.
You in Poole so think of what I would be up north and triple it
