The growing concern on the reduction of energy consumption in the residential sector of national economies rests on some parameters and issues that deserve to be resolved. Fundamental among these issues are the architectural concern, the appliances/services efficiency issue; and most recently the human behavioural dimension. This study focuses on the architectural issue with the objective of determining the level of energy efficiency consideration in housing design practice by the housing stakeholders in Nigeria, with a notion that arousing the professional cultures of the stakeholders, particularly architects and building service engineers in the direction of efficiency can help improve energy efficiency design practice. This is in recognition of the fact that more than one third of the world’s energy is used in buildings; and a majority in houses and apartments (Wulfinghoff, 2003) [1].