For the purposes of this chapter:

(1) “Mobile manufactured home” has the same meaning as provided in § 21-64;

(2) “Modular or prefabricated home” means the completely assembled and erected building or structure, including the service equipment, of which the structural parts consist of prefabricated individual units or subassemblies using ordinary or controlled materials, and in which the service equipment may be either prefabricated or at-site construction;

(3) “Prefabricated subassembly” means a built-up combination of several structural elements designed and fabricated as an assembled section of wall, ceiling, floor or roof to be incorporated into the structure by field erection of two or more such subassemblies;

(4) “Prefabricated unit” means a built-up section forming an individual structural element of the building, such as a beam, girder, plank, strut, column or truss, the integrated parts of which are prefabricated prior to incorporation into the structure, including the necessary means for erection and connection at the site to complete the structural frame;

(5) “Prefabricated unit service equipment” means a prefabricated assembly of mechanical units, fixtures and accessories comprising a complete service unit of mechanical equipment, including bathroom and kitchen plumbing assemblies, unit heating and air-conditioning systems and loop-wiring assemblies of electric circuits;

(6) “Prefabricated” means construction materials or assembled units fabricated prior to erection or installation in a building or structure; and

(7) “New” includes any unit not previously sold or occupied as a dwelling unit.