What is the allowable deviation of the room size of the building?

In residential design, the width of a house refers to the distance between two adjacent horizontally placed walls. Because it is based on the width of a natural room, it is also called a studio. There are strict rules for the design of residential rooms. According to the Modular Coordination Standard for Residential Buildings (GBJ 100-87), the following parameters are commonly used in the width of residential buildings: 2. 1m, 2.4m, 2.7m, 3.0m, 3.3m, 3.6m, 3.9m, 4.2m, etc. Setting a smaller bay size can shorten the space span of the floor and enhance the integrity, stability and seismic capacity of the residential structure. The allowable deviation value of the bay is 15mm, and the allowable limit difference value is 20mm.