Naturally the north house is the main house.
If the door of the north house is shorter than the door of the east house (referring to the door pillow), it means bad feng shui and bad luck. The owner will lose money or get sick, especially in the long run. It is recommended that the door pillow and the entire floor (commonly known as the door) of the north house be raised as a whole, and they must be higher than those of the east house.
In addition, if the lintel of the north house is lower than that of the east house, it is unlucky. The lintel (that is, the overall height of the door) must be raised to make it higher than that of the east house.
Of course, the criteria for judging the main house are the orientation and the door.
If your home faces south and the door is in the south, the north house will naturally be the main house.
If your home faces east and west, and the main door is in the west, the east room will naturally be the main house.
If your home really faces east and west, then the roof ridge of the north house cannot be higher than that of the east house under any circumstances.