The flexural behavior of polymer impregnated lightweight concrete reinforced with fiberglass-reinforced polymer (GFRP) bars was examined in this research. The primary distinction between lightweight and regular concrete is the reduced density mass. Using lightweight concrete minimizes the structure's dead load, allowing the structural designer to shrink the size of the column, footing, and other load-bearing elements. Because lightweight concrete is non-structural, polyester is employed in structural engineering to create a new generation of lightweight concrete impregnated with polymer. In addition, to resist flexural and tensile stress, glass fiber reinforced polymer (GFRP) is used in slabs.