Parametric Study of Multi-Storey R.C. Buildings Irregularity in Shapes studies stability of irregular buildings. Horizontally irregular shapes such as L-shape, U- shape and H-shape as well as vertically irregular shapes have been considered for study. Static analysis as well as dynamic analysis (Response Spectrum Analysis) is used for accurately measuring the performance of the irregular buildings. Software program STAAD.pro is used for the analysis purpose. Conclusions are made for the most stable shape and size of the buildings.