21. Whether the living accommodation occupied by the household to which the return relates is a–
(a)whole house or bungalow (and whether detached, semi detached or terraced (including end terrace));
(b)flat, maisonette or apartment (and whether in a purpose built block of flats or tenement, part of a converted or shared house (including bed sits) or in a commercial building); or
(c)caravan or other mobile or temporary structure.