Generally, cement concrete is weak in tensile strength and even the steel reinforced concrete has limited ductility and little resistance to cracking. Researchers are using agricultural and industrial waste to improve the strength properties of concrete and to lead sustainable development. This environmental reason has generated a lot of concern in the construction world. Natural fibres, as reinforcement, have recently attracted the attention of researchers because of their advantages over other established materials. Addition of fibres can increase strength and also reduce plastic shrinkage and drying shrinkage by arresting the propagation of crack. The present research was designed to check the workability and strength properties of sisal fiber reinforced concrete with different mix proportions and different percentage of fiber addition. Fibers were brushed, lined up and cut to obtain 4cm length. Degree of workability of concrete mix with 0.2% super plasticizer and water cement ratio 0.45 had good workability with slump value 53mm and compaction factor 0.88, which is effective, was obtained. Materials were hand mixed with 0.5%, 1% and 1.5% addition of fiber in M20 and M25 mix design and casted in cubes and cylinders. The obtained specimens were subjected to tests aimed to check the compressive, tensile and flexural strength. An increase in compressive strength by 50.53% and tensile strength by 3.416% was observed for 1.5% addition of fiber in M20 mix design respectively. An increase in compressive strength by 52.51% and tensile strength by 3.904% was observed for 1.5% addition of fiber in M25 mix design respectively.