When I was ready to hand over the house, I found that the clear height of the master bedroom was 5

You can't look at it that way!

In the national norms, such as "know the king" said that the gap of 20mm refers to the same board inside.

That is, at the top of the house, in the square separated by a ring beam or wall, the difference between any two points cannot exceed 20mm, but the situation you are talking about is the difference between the ceiling of the living room and the bedroom, which belongs to two different sections to identify!

Generally speaking, the span of the living room is larger, and the steel bars used in the floor slab will be thicker, so the floor slab will be thicker accordingly;

The steel bars used for the bedroom floor slabs are thinner, so the bedroom floor slabs will be thinner. You must have a bedroom space 5cm higher than the living room space, this is normal!

20mm, i.e. it cannot exceed 40mm

1. Allowable deviation value: net height 20mm, net bay and net depth 15mm.

2. Allowable extreme difference: net height, net opening, net depth uniform 20mm.