It is better that the courtyard is about 1-2cm higher than the corridor floor, which will affect the daily life.

The corridor is higher than the courtyard floor, which causes the sewage on the road to flow into the house, garbage, dust and sand to gather at the door, which inevitably leads to the door of the house being always dirty and smelling bad.

Because the house is lower than the road surface, humidity and smell are not easy to disperse, which has a great impact on the health of the home, especially the young or elderly family members.