Housing need in Nigeria is continuously on the increase both, in the rural and urban areas. Studies have shown overwhelming evidences of the appalling situation of housing in Nigeria, as it is the case in most Less Developed Countries. Housing development however could be greatly facilitated by recourse to the use of improved building materials of earthen origin. The materials offer low carbon solutions in housing thus contributing to the development of sustainable housing. Sustainable housing is environmentally-conscious housing that seeks to minimize the negative environmental impact of buildings by enhancing energy efficiency, moderation in the use of materials, and development of space. This is important in enhancing health, welfare, and productivity of occupants of buildings, and it is cost effective. This paper appraises the use of building earth and supplementary cementitious materials as low carbon initiatives in sustainable housing in Nigeria. It asserts that the development of sustainable housing could be readily achieved in Nigeria with the adoption and use of building materials of earthen origin and some supplementary cementitious materials.