I get a debug message when attempting to place houses in certain areas. Also, not sure if it is on purpose but i tried placing in an area far from town (north of vesper) and it said housing cannot be created in this area even though it was a regular grass patch close to nothing special in any direction. My only thoughts are that it might be for events or special spawns camps.
We are currently searching for a phantom bug with house placement caused by spellhelper region bleed. While to close to a town or road this debug message could be show, the ones we are looking for are where a house is being placed in a normal spot where a house could it. If your encounter this let me know so I can take a look.
It should show right below the failure message when placing a house if the denial is caused by the problem we are researching.