In this Research paper, was experimentally carried out to investigate the effects of introducing the cost between sand used concrete block and sawdust used concrete block. The concrete blocks are using coarse aggregate, fine aggregate, cement, water and sawdust to mix it. Using some percentage of sawdust in place of sand in concrete for example replaces 10%, 15%, 20% of sawdust instead of sand and remaining is same. After the concrete blocks are done I am going to see the difference in weight between the originally concrete block and the sawdust concrete block. The unit density of the concrete block is tested also. Research paper has proved that saw dust Concrete can be used as a Structural Concrete at suitable replacement percentages.