Transitional spaces are defined as spaces located in-between outdoor and indoor environments acting as both buffer space and physical link. Other than being functional as circulatory routes for the building, the designs of these spaces is considered very important by building designers for reasons of aesthetics, health and comfort, and as emergency exit routes in the event of fire. The importance of optimum energy consumption in transitional spaces is also important in non-domestic buildings, as these spaces do not generate income, hence any wastage associated with higher energy cost is economically difficult to justify.