Innovative Precast Builders patented Interlocking Precast Blocks revolutionalizes the building construction by using just a single design of precast block to construct a complete structure including the straight walls, 'L' joints, 'T' joints, and Cross joints. These patented Interlocking Precast Blocks challenge the conventional methods of construction by building a wall without the need for columns, reducing construction time and wastage. The interlocking , self aligning Precast Block can be used in various projects ranging form fencing and retaining walls to the construction of Single Storey, Double Storey or even higher structures. The Interlocking Precast Blocks building system are designed to conceal both electrical conduits and water piping and offer superior insulation properties which leads towards a greener future by reducing the cost of climate control. Careful and symplified detailing are incorporated in the design and the building system effectively interfaces with the other components and trade of works, e.g. door/window frame, roof, flooring and M&E installation.