They have to have so much height for it to pass building regs as a living space, I think it's 2.15m - I remember from when we did our attic room and we were worried we wouldn't have enough height to pass. There is also a minimum head clearance for staircases. We had to move oursHe’s still hunched slightly when he stands in the middle; the only place he can stand up straight is when he looks out of the window. How they’re gonna get a double bed in there I don’t know