Irregularities are mainly categorized under the plan and vertical irregularity in IS 1893 (Part 1): 2016 along with precautions for design and analysis in case of occurrence of irregularities. In this paper, an effort is done to identify irregularities present in existing commercial cum residential building satisfying provisions of Indian Standard code, and the complications on the adaption of mitigating measures. It is concluded that re-entrant corner irregularity is rampant in residential apartments and a soft storey is likely with open parking floors and building with variation in storey heights. Also, the three-dimensional vertical analysis method is ambiguous to adopt and the use of equivalent diagonal strut is ineffective with current clauses. Furthermore, additional clarification of weak storey is requisite.