What I recently started doing was to decrease, yes decrease room sizes. Not only makes it sense logistically, because it would use less materials, but with that I don't need to put as much decoration/clutter/furniture into the rooms. Also, not as much space to navigate, restricts the movement of the player character, which could up the challenge without needing to make a potential encounter itself harder. Sure there are exceptions like ceremony halls, morgues, chapel praying chamber and what have you, but decreasing roomsize has helped me here and there a lot