Don’t drill too many holes in two adjacent houses.
Theoretically, it is possible, but you must know that once the two adjacent houses are connected, all the layout will have changed. Because, from the perspective of Feng Shui, each house has its own nine palaces. If it is opened into a large house, then its nine palaces will also change.
Then, all the auspicious and unfavorable aspects are different accordingly. Some people think that if the upstairs and downstairs houses are connected, the changes in the nine houses will be smaller and there should be no problems. In fact, when the upstairs and downstairs houses are connected, other aspects of the physical situation will be different. Changes will also occur, so caution is also required.