The present paper deals with an innovative use of hydroponic greenhouses, in which plants grow without soil, using mineral nutrient solutions in a water solvent. The paper highlights the advantages of the hydroponic cultivation system and describes the project of a particular solar greenhouse that can be used as a space for the cultivating of vegetable species, but, thanks to its transformability features, can generate spaces assigned to different destinations: the proposed solar greenhouse can be occasionally adapted in order to become a receptive facility, exploiting an innovative system for cultivation lifting. The result is a flexible, modular and mobile architectural structure, totally reversible and energetically independent, providing support to a farming activity. Consequently, it may help even the Italian tourist industry that is increasingly based on country B&B and agritourisms located in the most valuable zones that always are even national, regional or local protected areas where the construction of new traditional building is prohibited.