Federal law dictates that each state is responsible for the code requirements of a state and/or municipality/city. Some states have a state code that each municipality/city must adhere to.
In addition, each municipality/city may have supplementary requirements. Some states (i.e. Missouri) have a state code for state buildings, but allow each municipality/city to decide which codes are valid within that municipality/city.
While this may seem confusing, a school district should conduct an online search of municipality/city codes. From there, the district will quickly discover whether the municipality/city has a unique code or whether the municipality/city is under the requirements of a state code.
Online resources such as www.municode.com have up-to-date lists of all municipality/city codes.