Section 15A-1-305 - Modification of factory built housing units and modular units(1) A modification to a factory built housing unit shall be made in accordance with the following: (a) Modification to a manufactured home or mobile home before installation or setup of the unit for habitation shall be made in accordance with the HUD Code.(b)(i) Modification to a manufactured home or mobile home after installation or setup of the unit for habitation shall be made in accordance with the HUD Code if the modification does not include the addition of any space to the existing unit or the attachment of any structure to the existing unit.(ii) If a modification to a manufactured home or mobile home after installation or setup for the unit for habitation includes the addition of any space to the existing unit or the attachment of any structure to the unit, the modification shall be made as follows: (A) modifications to the existing unit shall be in accordance with the HUD Code; and(B) additional structure outside of the existing unit shall be in accordance with this chapter.(2) A modification to a modular housing unit shall be made in accordance with this chapter.Enacted by Chapter 14, 2011 General Session.