This project work “structural design of G+2 commercial building at Nyamache Sub County_ Kisii County sector is a part of fulfillment of advanced diploma as awarded of Kisii National polytechnic (KNP). It contains with conception, structural design which provides proper communication to all of users, this project gives more information about the design and analysis of commercial building. The final project report contains five chapters that are: General Introduction, Literature review, research methodology, system design, analysis and implementation and then Conclusion and Recommendation. This project report also has been compiled referred to books of different authors and by using equation provided in codes of practice like; British standard used in design of the commercial building. The analysis of each structure members starts with evaluation of all loads that are expected to be carried by structure including self-weight. The structure design of this project detail, beam, slab, stair, column, and foundation by BS8110.