This thesis deals with the redesign of the bathing facilities in the area of Picrolimni Kilkis. Picrolimni is an area of special natural beauty, with famous waters rich in natural sediments and high salt content. The baths have all those natural characteristics that could turn the area into a pole of attraction and development if the appropriate infrastructure is in place. The work comes to propose a design solution for modern building bath facilities in which visitors will be able to experience a holistic bath therapy experience. At the same time and beyond their bath, they can enjoy fine local flavors in the restaurant, while if they wish, they can combine their bath therapy with a stay in the guesthouses of the facilities. The design proposal talks about respecting the natural landscape of the area and the ways in which this comes to be displayed through the design of the bathrooms. Furthermore, reference is also made to energy solutions through which the building facilities will be able to be energy independent, drastically reducing their environmental footprint and their dependence on the energy network. In conclusion, the work tries to analyze the reasons why it is considered necessary to redesign the bathing facilities of Picrolimni and how they can develop into a point of reference and regional development.