The term 'Architect Addition' refers to the process of adding an ANNEX, ELL, or WREN to a building. An ANNEX is an additional structure that is connected to the main building, usually for extra space. An ELL is an extension of the main building, typically used to add more living space. A WREN is a small addition to a building, often used to add a porch or other outdoor area. All of these additions are designed and constructed by an architect.