Concrete, the commonest construction material in the world today also has a significant impact on the environment though high cementing usage and intensive extraction of natural aggregates. The cement industry alone contributes to about 8 percent of the world CO₂ emissions and aggregate mining causes land degradation and depletion of resources. In reaction, researchers have been examining more and more supplementary cementitious materials (SCMs) and recycled aggregates (RAs) to come up with sustainable concrete. The research paper explores the mixed use of sugarcane husk ash (SHA) a silica rich agricultural industrial waste and construction and demolition waste as partial substitute of cement and natural aggregates, respectively. Replacement percentage of 0, 5, 10 and 15 were designed in concrete mixes. It was experimentally tested by use of slump tests to determine the workability, compressive strength tests and flexural strength tests at 7 and 28 days curing, according to ASTM and IS standards. It was found that the control mix had 23.35 Mpa compressive strength at 28 days and mixes with SHA and RA showed lower but acceptable strengths. The optimal substitution was experienced at about 15 percent replacement, where performance was stabilized with marginally strength recovery because of enhanced microstructural packing. The results indicate the technical feasibility of SHA, RA concrete to be used in structural projects in Bangladesh and alike settings, and also add to the waste valorization, carbon reduction, and circular economy objectives.