This article aims at providing a clear and step-by-step guideline on the excavation process and foundation for a biogas plant. Pointing out the possible options that would be best in the construction. This article goes over the following steps: excavation and methods to be used in pit digging, identification of a central point, base construction, laying of the bricks, designing of hooks, inlet, and outlet piping as well as plastering, supporting, and curing the wall.