Irregular building configurations are at serious risk during earthquakes. Irregularities in stiffness generate a mechanism of soft storey which leads to stress concentration in the columns. The paper presents the non-linear behaviour of a G+5 Reinforced Concrete (RC) building for soft storey at ground floor. Parametric study on displacement, inter storey drift, and base shear using equivalent static analysis and non-linear static analysis (Pushover analysis) has been conducted to evaluate the effect of these factors on the behaviour of buildings with soft floors. For safeguarding an inadequate building against potential earthquake damage in the future, retrofitting is one of the best solutions. In order to make the existing columns stronger or more suited for the desired function, a process called R.C.jacketing has been used. The structural analysis of the building was conducted using the SAP 2000 V22 program. The building's load bearing capability was discovered to be substantially enhanced when jacketing was applied to the frame columns. In a similar vein, there was a marked increase in the displacement of the roof. The hinge configuration on the ground floor, first floor, and second floor of the original frame is almost similar. However, with the jacketed frame, the development of the hinges in the ground floor columns is postponed. Based on the order of hinge creation, this was recorded. Furthermore, the elastic stiffness showed a marked increase, and the reinforced frame's ductility capacity rose significantly.