In dwarf fortress when you define a bedroom the size seems to automatically snap to include the walls of the bedroom. When you have two bedrooms that are right next to each other the two rooms will share a wall, meaning that there is overlap.
Does overlapping borders decrease room value when only the walls are in the overlap? Does overlapping borders decrease dwarf happiness? Is it better to have a 5x5 that overlaps with neighbours or 3x3 that doesn't? Does overlap of an office with a bedroom matter?
Also, do bedrooms need doors, can I make exit stairwells instead? I'm planning on giving crafting dwarves bedrooms directly below their workshops.