The causes and effects of inadequate shelter provision in a developing country such as Ghana are explored. Calcined clay pozzolana is introduced as a cost-effective partial substitute to Portland cement for housing construction. In this research mechanical activation of clay pozzolana to enhance reactivity was investigated. Properties of the mechanically activated pozzolanas were studied and reported. Mechanically activated were found to have improved properties such as enhanced compressive strength compared to reference Portland cements.