Inner walls can only be planned once all the exterior walls of a house are complete. To plan inner walls activate a [[mallet]] or [[trowel]], right-click a tile border inside the house and select ''Plan'' > ''Inner wall''. On the wall plan select a wall type and continue as explained above.
=== Multi-storey story housing ===
Your house is now complete with a roof, floor and finished walls. It's probably quite simple; but when you're a more skilled player you could make something much better, fancier and with more than one floor! See [[Multi-story housing|multi-story housing]] for more information.