The Superintendency responsible for the project assessed the following criteria as fundamental for integration; the aesthetic characteristics of the BIPV modules (colour and surface finish), their geometric positioning in relation to the shape of the roof sections and the orientation of the building (layout of the system, modularity), adherence to and coplanarity with the roof, non-reflective surfaces and visibility from the surrounding area, particularly from the road, the lake and the surrounding landscape.

The project for the roof is the result of close collaboration between the architect, the Superintendency and the company manufacturing the modules and the roof. The photovoltaic modules were already in production but had previously been used almost exclusively for sail boats and small constructions that require flexible systems.

Architectural integration took place through a long design process. Initially, the choice went to a type of module with coloured cells, in order to favour aesthetic integration with traditional local construction materials and the surrounding landscape. The roof had to be made of a material that also resolved the problems caused by the presence of a large Himalayan Cedar that loomed over the house and that, with the constantly falling needles, caused functional problems with the previous tiled roof. To this end, three prototypes were developed. Initially, a roof in Pietra Valmalenco, a material often used on historical buildings throughout the lake area, was chosen. The task was therefore to match the photovoltaic modules to this type of roof, for which two prototypes were made. The first required the creation of a transparent support, made by combining two sheets of glass sandwiching classic polycrystalline  photovoltaic cells. Integration was based on the transparent nature of the support. The second prototype was based on chromatic matching. For this, a dedicated module was created with grey-green cells sourced from Germany, sized to adapt perfectly to the width of the Pietra Valmalenco tiles. A 1:1 scale prototype was created in collaboration with Brandoni, an Italian photovoltaic module manufacturer, in order to assess problems related to installation. The result was aesthetically pleasing, but not practical, as the modules could not be walked on and required complex maintenance. Then, a technical working group was set up involving Solbian and Prefa, to define a third prototype, which was then chosen as the definitive solution, with modules that could be walked on, were slim and efficient, and that blended in perfectly with the roof.

The design process demonstrated the importance of collaboration between technicians, artisans and manufacturers in the creation of a conservative restoration project. In designing the tailor-made photovoltaic modules, collaboration with the company supplying the roof was fundamental, as - together with the architect and the Superintendency - it was able to define a project that was integrated in terms of aesthetics, technology and energy.