Evaluating the vulnerability of tall structures to potential earthquakes in a given region is a multifaceted challenge. This paper delves into seismic performance assessment design, aiming to empower engineers to construct buildings with reliable seismic resilience. Focusing on North East India, known for its high seismic activity, the study scrutinizes a 21-storey building’s seismic behaviour, both with and without shear walls using the software ETabs®. Employing various analytical methods like P-delta Analysis, Pushover Analysis, Response Spectrum Method, and Time-History Analysis, the investigation aims to gauge the effectiveness of shear walls in fortifying the building’s seismic resistance. Through comparative analysis, the study aims to elucidate the impact of shear walls on key performance metrics such as lateral displacement, storey drift, storey stiffness, base shear, and time period. This holistic approach seeks to deepen our understanding of dynamic structural behaviour under seismic conditions.