Abstract: A prefabricated living quarters structure (10) adapted to be received within an existing building such as a garage (12) attached to an existing house (14), the structure being comprised of a plurality of wall panels (28) which are joined together to define the exterior walls of the structure (10), the structure having overall dimensions only slightly smaller than the building (12) within which it is received so that the structure (10) essentially fully occupies the space of the existing building (12) within which it is received; the structure being particularly intended for use by the handicapped and having full living facilities therein, such as a complete bathroom unit (30), the structure (10) having means placing the same in communication with the exterior thereof and also with the interior of a house (14) to which the garage (12) which receives the structure (10) is attached.