For our project, there are 2 offers for the earthworks, drainage, and sewer connection; single-family house with basement, 10.8 x 12.8 m with basement, site also with slope: Excavation 8 k € Drainage, sewer connection, soakaway: 23 k €, transport/disposal: 32€/ m^3 + VAT: estimated about 400 m^3: Total approximately 55,000 €