Check out the patch notes for the v17 Precursor Update here: http://maplestory2.nexon.net/en/news/article/53778/precursor-update-v17
Undoing house expansions
MapleStory 2 Rep: 770
I have made my house area too big when I began playing and there is no way to revert this. I am very puzzled why this feature hasn't been implemented so soon or even with launch. I'd really like to customize my house, but It's not something I am able to do with such a large space when my ideas are for a smaller grid.