Placing Houses over obstacles As of Publish 19, most of the smaller object such as rocks, flowers and brambles no longer block house placement. As a rule, anything you can walk through will not block houses. Anything that you cannot walk through, will. Non-blocking objects: The flowers, mushrooms, rocks, logs and brambles shown below do not block house placement. You can build your house on top of them.   Blocking objects Solid objects will block house placement. These objects include the large trees, large rocks such as those found around moongates, and crystals. Unlike other loose objects dropped by players, water barrels will block house placement! You can remove these by filling an empty pitcher from the barrel (you may need to repeatedly do that up to 20 times before the barrel is empty).

These nasty little trees will block placement... most of the time. In some cases, houses can be placed over them, though it is not clear under wat conditions. It seems that sometimes these trees are allowed under the middle of the foundation of the house, but never under the edges of it. If you come across an empty spot with such a small tree, a little experimentation may reveal that certain houses will fit over it.