The application will provide information on the cost of building a suitable ground reservoir for the residential villas in general and based on the calculations on the prepared equations related to the dimensions of the tank and its specifications. The paid version includes the costs and quantities of concrete, iron, the contractor, internal and external insulation, block, rebar, excavation and filling in detail, help the owner to organize the work and make the right decision. The application carries the code NB 01F and is the first free version in a series of versions of construction costs will be completed and if a copy of the full details with the code NB01.