How high is the external wall on the second floor of rural self-built houses?

In general, a duplex building with one and a half floors in rural areas can be made to be 6 meters high, because in rural areas, if a second interview with one and a half floors is required, it can be made to be 6 meters high, and then the first floor can be reserved for about two meters, and then the second floor can be slightly higher, so the duplex building with one and a half floors in rural areas is generally about 6 meters.

Rural self-built houses are about 3.6 meters on the first floor, 3.4 meters on the second floor and 2.2 meters on the third floor.