After recently reading up on the fact that you can force the vase through the wall in the bathroom to get the screwdriver early, I decided to go test out this neat trick elsewhere in the house. After a short period, I had noticed that the vase refuses to go through wall with paintings or objects on the other side or if the wall is an external one (leads to the exterior of the house). With this information, I set out to test if there are/were any rooms not yet added (as of 1.5).
Firstly, I had no success, until I reached the basement. Every wall except for the back wall that is home to a pole with a pot on it wasn’t able to be penetrated. After pushing the vase through the wall, I heard a ‘clunk’ after a fraction of a second. What this means is that there is static floor present behind said wall (I did check the garage and sauna below after preforming this action, to check that the vase was not there). Could this be a new room, prepared for a future update?
I apologise for this if software has been developed that allow the player to view the house from an “out-of-bounds” area.