At the present in construction industry the post tensioning method used widely due to its advantages. In developing countries like India the benefit of post-tensioning slab are yet to be recognized. By using post tensioning method we can achieve the most economical and safe design for residential as well as commercial buildings. This paper deals with the study of post tension flat slab with respect to cost estimate, strength and serviceability. The design was analyzed by using ETABS software. For this application of design procedure a commercial building is consider as a case study. The plan of the commercial building (G+7) is considered. The results indicate that PT slab has cost better than that of RC flat slab system. Multistory structure like shopping mall, Residential building post tensioning method is mostly preferred. By application of this method in the building construction it increases strength as well as durability of structure. Due to post tensioning technique the structure give better aesthetic look and economic solution as that of conventional method. Now a days PT slab used is large scale due is its Superiority and also it can be apply to the various type of structure.Post-tensioned slab had analyzed and designed using ETABS software.

Keywords : ETABS, RC Flat Slab, PT Slab, Post Tensioning, Multi-Storied.