House Annex is a term used to describe an additional structure that is attached to a house. It can be used for a variety of purposes, such as a GARAGE, an extra bedroom, or an office. The two crossword solutions for House Annex are GARAGE (6 letters) and ELL (3 letters). GARAGE is a common type of House Annex, which is typically used to store vehicles and other items. An ELL is another type of House Annex, which is usually an extension of the main house and is often used as an extra bedroom or living space.