In the same way that the towers on our streets get bigger as we expand the inside, it would be cool if the house expanded as well. Just height would be neat, but maybe horizontal expansion could unlock new styles of the different sections. Some house designs could use this to get bigger (the firebog house could get more pods) and some could use it to get fancier (the new castle could allow shinier gate, cool carvings, etc.).
(I know that's so many more art assets to build. But it really would be a pretty nice outcome)