A concrete foundation (10) is ready-built at the factory and transported as a ready construction to the building site. At least one sewage treatment unit (20) to be connected to the sewage piping of the building to be placed on the foundation is integrated to the foundation for treatment of the sewage generated in the building. This unit may be an emptiable closed container, an emptiable septic tank, a chemical purification unit, a biological purification unit or any other sewage treatment unit suited for the purpose. In unit has an inlet connection for connecting the unit to the sewage piping of the building, and an outlet connection for leading the sewage out of the treatment unit. A building may be built on top of the foundation in the factory, whereby the foundation and the building are transported as one complex to the building site.
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