Just that really! want to save as much space as possible both where the stairs are coming from (taking a chunk out of a bedroom) and up in the loft room. We have a narrow main stairs anyway (765mm), and were thinking of trying to get either a 650mm or 700mm staircase. Our architect has planned the stair to conform to building regs for everything else but there is no minimum width for the loft stairs apparently. So how narrow is bearable??!!