Sustainability is the need of the hour due to depletion of natural resources causing environmental issues. The concrete which is the second most consumed material on the planet only next to water uses cement, a manufactured material which account for emission of carbon dioxide during its manufacturing process. Geopolymer concrete, an alternative to conventional cement concrete does not use cement and hence is sustainable in production. The construction and demolition waste which is being produced in increasing quantities due to the demand from the increasing population and their infrastructure. The best way of utilizing this construction and demolition waste can be brought through addition in concrete. In this present investigation, geopolymer concrete is considered and to further improve its sustainability, crushed construction and demolition waste is used in it. The natural aggregates (both coarse and fine) were replaced in different levels (0%, 25%, 50% and 100%) with aggregates obtained from construction and demolition waste. Two different Geopolymer concrete mixes were considered in this study i.e. G30 and G70. The workability of this concrete is determined using slump cone test and all the mixes were found to be having sufficient workability. The various hardened properties viz., compressive strength, split tensile strength and flexural strength were evaluated. The results were compared for understanding the effect of various replacement levels (0%, 25%, 50% and 100%) of construction and demolition aggregates (both coarse and fine). From this, it is understood that the natural aggregate replacement at 50% with aggregate from construction and demolition waste showed better results. Hence, from this investigation, it is recommended that 50% replacement level of construction and demolition waste is suitable for Geopolymer concrete.