Geopolymer is a potential alternative to ordinary Portland cementitious binder in terms of energy conservation and environment protection. However, utilization of geopolymer material is limited, due to practical difficulties such as rapid setting and poor workability. Therefore, the objective of this investigation is to evaluate the effect of boric acid as a set retarder on properties of geopolymer binder for its wider applications. It is found that the setting time of geopolymer paste enlarges with increment in dosage of boric acid. The extra water required for the optimum flow of geopolymer mortar was found about 20 %. The compressive strength properties of geopolymer mortar improve with the increase of boric acid. The optimum dosage of boric acid as set retarder was found 2 % of geopolymeric binder in present study. The results of this study will guide in effective use of boric acid as set retarder in geopolymeric material for its application of in-place casting and achieving the target of sustainable construction.