Abstract: Developing countries especially those in Africa, such as Kenya, are facing the challenge of a growing middle class resulting in greater demand for housing facilities. Alternative and affordable building materials are being sought after. The usage of partial replacement of coarse aggregate using expanded polystyrene (EPS) beads in concrete to produce lightweight concrete gives prospective solution to the construction industry.Therefore, there is need to understand how the concrete replaced with EPS beads behaves and whether it meets the stipulated standards.