Tenn. Code Ann. § 13-3-504

All structural improvements that will affect the value and appearance of a residence moved to a developed area of single family residences shall be made to the residence within one (1) year of being moved into the area. If within one (1) year of that date, improvements have not been completed on the residence at least equal to the average standards in the developed area, the residence shall be deemed to be in violation of the local government building codes, and penalties associated with the violations may begin to accrue in accordance with all relevant local building codes and ordinances adopted and in effect in the local jurisdiction where the residence is located.