Reinforced concrete (RC) squat walls encountered in many buildings play a vital role in resisting lateral forces due to seismic, wind and explosive loads. Numerous research efforts and recommendations on RC shear walls have been reported during the past five decades across the globe by various researchers. Practically, openings in shear walls are inevitable in forms of doors, windows or some other functional requirements, whose influence is tremendous under seismic loading. The experimental investigations on RC squat walls with window and door opening in comparison with control wall without opening are carried out. The shear strength, lateral stiffness, ductility factor and energy dissipation capacity of the shear walls have been found to be significantly reduced due to the openings. The reduction of shear strength, stiffness and energy dissipation of the RC wall with opening is rapid during the subsequent consecutive cycles after cycle in which the maximum peak load occurs. The integrity, cracking resistance, shear strength, stiffness, ductility and energy dissipation capacity of the squat walls have been improved significantly by fibres randomly distributed in concrete with additional reinforcement detailing in the corner regions of the openings,exhibiting that it is an efficient solution for RC walls with door openings. Though the shear strength predicted by the ACI 318 equations in the shear walls with openings, is closely agreeable with the test results, it does not state the shape of the opening. Further, as suggested by ACI 318 that the weak plane coincides with a horizontal plane in the opening, but it does not seem to be observed from the experimental investigations.