Building codes and permitting requirements vary widely in different states and municipalities. Research your particular "Authority Having Jurisdiction", whether it is the state, county or city level $($Boca Raton, FL$).$ Provide specifics as to the year of adopted code. Initially, most would think the latest and greatest code would apply, but after this exercise and discussion I would imagine older codes are still used. For example, the City of Oklahoma City and the State of Oklahoma have adopted only the $2009$ version of the International Building Code. Also, in many counties of Oklahoma, an individual can work as a general contractor without a license provided from the state. This information is public and can be found at your local government's building or development services website.