What are some common laws regarding maximum occupancy of an apartment?

Common laws regarding occupancy of an apartment are the Fair Housing Act and the Uniform Housing Code, SFGate notes. The Fair Housing Act states that landlords cannot discriminate tenants based on family size. The Uniform Housing Code establishes a minimum size for each dwelling.

The Uniform Housing Code has a minimum size for each dwelling in that there must be at least one room measuring 120 square feet. Other rooms in the home, excluding the kitchen, must be at least 70 square feet, SFGate notes. Two people can generally occupy a minimum-size dwelling. The home must increase by 50 square feet for each additional occupant. Landlords and residents must adhere to city and state laws as well.