The main objective for any civil engineer is to plan and execute the structure to reduce the impact of disaster, by understanding how a building is being affected by the various external loads. Cities nowadays are labyrinth of concrete material, which are hazardous under heavy loads. These complex and intertwined systems, extremely vulnerable to threats from natural hazards, which has got potential of converting into disaster causing loss of property and life in multiple digits. Keeping this in mind, the first part of the study was to go through various journals related to impact of earthquakes on multistoried building and cases of seismic failures during major earthquakes of Bhuj (2002) and Indian Ocean Earthquake and Tsunami (2004); their various shortcomings and giving recommendations based on these, also the use of Base isolation technique for reducing the impact of disaster is studied/explained. The second part of our study is to analyze and design a multistoried building of G+10 as per latest codal provision using and also to find out how vertical extension of same building by 4 floors i.e. G+14 building can be done by modifying the main structural element of column , beam by using STAAD PRO in zone IV. The design involves load calculations including seismic load and analyzing the whole structure by STAAD PRO. Our final work was to analysis and design of a G+ 14 RCC structure by increasing the number of floors of the existing building of G+ 10 buildings and changing the zone from IV to V and thereby retrofitting the building by hit and trial to make it serviceable by increasing the beam and column size of G+14 building.