In principle, it is not recommended to open the door on the wall between the two houses, because from the perspective of Feng Shui, this way of opening the door is not very auspicious and can easily gather evil spirits and affect the family's financial fortune. At the same time, this way of opening the door may cause disputes between family members and quarrels between neighbors.
Of course, if you don’t care about Feng Shui issues, you can also consider solving the problem by considering the location, size and material of the door from the perspectives of lighting, load-bearing and safety. It is best to consult a local professional engineering team or Feng Shui master before opening the door to ensure there are no safety hazards or adverse effects on the structure of the house.