The demand for lightweight concrete in various construction applications has grown, aiming to reduce overall structural weight. However, achieving adequate strength while maintaining low density is a challenge. This study evaluates lightweight concrete by incorporating expanded polystyrene (EPS) as a partial replacement for coarse aggregate. Different mix proportions of EPS and coarse aggregate were tested, along with the addition of steel fibers and silica fume to enhance bonding and durability. Physical and mechanical properties of the lightweight concrete were examined and compared to standard concrete. The results indicate that EPS-based concrete offers controllable low density and reinforcing materials like steel fibers improve its overall strength.