The present work focuses on sustainable construction by reusing the waste PET bottles. Using of PET bottle in construction as a brick element were seen in the past, but this type of construction requires more mortar due to the cylindrical-frustum shape of PET bottles. The present work is to change the cylindrical-frustum shape of used PET bottles to a hollow rectangular prism using heating and semi-molding techniques without shredding the plastic bottle. Further, the shape of PET bottle will be in quasi-rectangular prism and filling it with a soil/sand material to use as a construction material alternative to bricks. The study shows that the PET bottle construction has good strength similar to clay burnt bricks. This type of PET bottle brick can be used as load-bearing walls for single-story buildings and infill walls for framed structures. Using PET bottles in buildings as a replacement for traditional bricks can solve the problem of environmental damage. The fusion is not involved in process of reshaping and reusing, and therefore saves energy and has less impact on the environment.