I would suggest adding a "house relocation" function,
For moving to a same size or larger plot.
While purchase the new plot when you already have a house, you have an option to buy "house relocation",
the cost would be for example, the permit (i.e. 3.5M for large) x 1.5 or x2 etc.
Then your existing plot will be released and everything will be put into the new house directly.
Private chamber / Workshop progess / Chocobo in stable / Plant on gardens..etc everything will be carried to the new plot.
So you just need to relocate your housing item. ^^;
Ideally also adding some discount for trade-in your old plot when purchase this "house relocation".
