Go into build mode and turn your attention to the top of the screen. In the middle there are four arrows that say ‘move lot and house’ select which option you like (note: when selecting house you can choose something not attached to the house as necessary). Then press circle until you are back in cursor control and select your house, then press R1 or L1 to rotate accordingly.
It seems ‘move house’ is the option you should select. It does not seem to rotate on lot, for me st least.
Good luck!