We have a dining room that is just used for walking through from hall to kitchen. There's a conservatory off it and the living room, so it's pretty much already internal. It's never worked as a dining room, having a big opening to the conservatory, a door to the kitchen and also the living room.
We're thinking of putting a much bigger extension along the back making it totally internal. I'm half-tempted to turn it into a bathroom (it's below the upstairs bathroom and storage, as that's what we need downstairs.
Anyone done this? This house has doors and windows everywhere, so there's very little bare wall anyway. I can't think how it would be, any suggestions for sketching software would be very welcome or examples.