Concrete slab is an important two dimensional or planar element, used in all types of structures such as floors and roof covering. Bubble Deck slab is a futuristic method which can effectively eliminate all the concrete from middle of slab by replacing it with High Density Polyethylene Balls (HDPE) and provides thermal insulation. In this technique, the reinforcement mesh acquires, allocates and attached the balls at exact position and also stabilizes the lattice. By this technique structural weight can be reduced from 25% to 50.The main aim of this study to comparatively study of Bubble Deck slab and conventional slab under cost analysis, load bearing capacity .i.e. strength and efficiency too and also families and create awareness to all. The advantages of this technique are less energy consumption - both in production, transport and carrying out, less emission - exhaust gases from production and transport, especially CO2.