This study aims to address the environmental challenges posed by construction and demolition waste (CDW) through its upcycling into a green concrete solution that supports the principles of the circular economy. To this end, a new generation Eco-hybrid cement was developed for the binder phase, using a ternary combination of CDW, calcium sulfoaluminate (CSA) cement, and Portland cement (PC). For the aggregate phase, 100% CDW-based recycled concrete aggregate was utilized. The green concrete was analyzed for its mechanical and environmental performance using comprehensive testing parameters, including compressive strength, drying shrinkage, water absorption, freeze-thaw resistance, chloride permeability, and life cycle assessment. The green concrete achieved a compressive strength of 43.8 MPa at 28 days, with acceptable early-age strength owing to CSA cement and increased strength over time due to the pozzolanic activity of CDW. Its durability was comparable to PC concrete, making it suitable for structural applications. Microstructural analyses validated that CDW components contributed to mechanical performance by forming C-S-H gel at later ages. Environmentally, Eco-hybrid cement resulted in a global warming potential of 575.34 kg CO