Polyethylene Terephthalate (PET) and Bamboo Sawdust take an exceptionally long time to decompose. These wastes can cause detrimental pollutants that can have an impact on the environment in the remote future. To help decrease pollution, these substances can be used as an alternative material in producing concrete hollow blocks which are a key item used in construction. The purpose of this study was to test the performance of PET particles and bamboo sawdust as an example partial replacement for the use of fine aggregates in the manufacture of concrete hollow blocks. PET plastics were cut into small pieces at least 1 mm in diameter and bamboo powder sawdust was collected. Both the compressive strength and weight classification percentage were determined by testing the hollow blocks. Four set-ups with differing percentages of PET particles (0, 5%, 10%, 15%) with BSD (1%) were prepared to partially replace the volume of sand. The block dimension was 4in x 20cm x 40cm and a 1:4 cement-to-sand ratio having a 0.5 to 0.55 water-cement ratio was used. Forty-eight (48) hollow blocks were produced and underwent curing times of 7, 14, and 28 days and were examined afterward. According to the findings of the study, it was seen that as the alternative materials in the blocks decrease, their respective compressive strength increases. There were no consistent results observed with the density. The CHB with 5% PET and 1% bamboo sawdust cured for 7 days was discovered to be the desirable proportion in producing CHB as it obtained the highest average compressive strength and greatly reached the required average tensile strength of the Department of Public Works and Highways (DPWH) and ASTM C129