according to the national code for design of residential buildings, the floor height of a commercial house must meet the following standards:

the floor height of a residential house should not be higher than 2.81m. When using the space inside a sloping roof as a bedroom, the floor height of half of the area should not be lower than 2.11m, the lowest height of the rest should not be lower than 1.5m, and the floor height of a kitchen should not be lower than 2.21m..