Diaphragm wall is very common type of earth retention scheme in deep excavation/foundation, weak/poor soil condition or congested site condition. Routine deep excavation projects require the use of retaining wall in conjunction with supports either in the form of internal bracings or tie-backs to resist lateral earth pressure. The design is one of the most complex stages in realizing the building, and it is usually time consuming. This study aims to suggest the most economical diaphragm wall section for a commercial building having clayey soil in Surat, Gujarat, India. This study also presents design of anchored diaphragm wall for 15.35-m-deep excavation in clayey strata. The behavior and performance of diaphragm wall is predicted by finite element method in PLAXIS 3D and PLAXIS 2D. The results are presented in the form of shear force, bending moment and deflection. The FEM results are compared with those available in the literature. This study should be of great interest to foundation field practitioners.