Sustainability in the field of civil engineering can be achieved in a variety of ways, such as through the use of recycled building materials, and can assist in the accomplishment of a far greater range of sustainability objectives, including those relating to economic development, climate change, and other challenges. Over the years, numerous studies have been carried out to improve soil strength. Various engineering characteristics of low shear strength soil are enhanced by the application of ground improvement techniques, such as the use of Portland cement, lime, fly ash, ground freeing, jet grouting, and vertical drains. An important consideration in the ground improvement can be done by the use of vertical columns which are now favoured as a cutting-edge and contemporary method. In this study, vertical columns are made up of demolished building materials which is a waste material when compared with the conventional column. The columns are also encased with natural geotextile in order to utilise it as an effort to use environmentally friendly materials and achieve sustainability. In this paper a numerical analysis is conducted to study the vertical settlement and lateral deformation of soft clay such as clay with ground improvement method (use of vertical columns encased in natural geotextile) and without any ground improvement method and further result has been discussed.