This study explores the properties of lightweight concrete incorporating slag and steel fibers. Cubic and cylindrical specimens were created with varying fiber percentages (0%, 1.5%, and 3%) and slag replacements (0%, 10%, 20%, 30%, and 40%). The samples underwent testing for compressive strength at 7, 28, and 90 days, tensile strength at 28 and 90 days, and water absorption at 28 and 90 days. Results indicate an enhancement in both compressive and tensile strength with a 20% slag replacement in all specimens. Additionally, an inverse correlation is observed between overhead percentage and water absorption, where an increase in overhead corresponds to a decrease in water absorption. Despite no substantial impact on compressive strength, the incorporation of waste steel fibers consistently improves tensile strength across all fiber percentages. This study underscores the potential of these eco-friendly additives in promoting environmentally conscious construction practices, aligning with the principles of sustainable development in the concrete industry.