One of the main objectives of contemporary society and international research is to improve the physical and psychological health and well-being of the population, especially within the urban space. An effective approach to address this complex issue must necessarily be trans-disciplinary, and must be framed in the broader perspective of the Science of Sustainability, in particular the Psychology of Sustainability and Sustainable Development, as a frame of reference. The study shows the first results of research, in terms of methodology and qualitative analysis, with the following objectives—identification of the criteria for intervention for a healthy city design, with particular attention to the psychological, architectural, and construction aspects, and an initial verification of these criteria, through a case study consisting of a section of the city’s waterfront, in the city of Livorno. This case study has enabled, both, the definition of an innovative design and implementation of solutions, for the correct use, accessibility, and management of spaces. It provides the first evaluation of a possible digital analyses of a waterfront, before and after intervention; and highlights the potential and the critical aspects of the process of recovery and re-appropriation of an urban space, for a new social life, within it.

There is an ever increasing interest in identifying the links between architecture and public health and in how urban design can positively influence the latter. The psychology of sustainability and sustainable development represents an innovative research area as a recent contribution to sustainability science and its trans-disciplinary configuration. The research topic deals with the importance and the centrality of the user-centered approach in the observation of the relationships among mankind, technological systems, and built environments, for projects that guarantee the conditions of physical, mental, and social well-being. Starting from the plurality of different disciplinary sectors, from anthropometry and sociology to psychology, “human experience” and user’s expectations are explored, understood, and systematized. The analysis of the relationship between health and urban design has allowed researchers to identify design strategies to improve the level of urban livability. The city of Pisa is the case study; mobility within the city is redefined through various levels of the use of space so that paths and areas of inclusion and socialization are re-valued, while new scenarios for some urban spaces open up. In this perspective, the design strategies synthetically follow two main directions: the re-appropriation of these places by the citizens and, at the same time, the promotion of their well-being from both a physical and psychological point of view.

Green roofs and green and living walls are increasingly seen in cities, because they are an important strategy that addresses some key urban environmental issues and allows the achievement of different benefits. Among these, the most relevant ones are reduction of the “Urban Heat Island” effect, of rainfall contributions to the sewer system, of environmental impact and energy saving, and retention of harmful substance. The study aims to analyze different systems of greenery systems integrated (GSI), green roofs (GR), and green and living walls (GW-LW), as a possible retrofit technique of the envelope of heritage buildings and especially their applications in the context of historic cities in Italy, pointing out positive and negative aspects. Particularly, it pays attention to the green retrofitting of buildings and to the technical problems related to the installation of systems, since at the moment there are already several studies that show the environmental and microclimatic benefits of the integration of vegetation in architecture. This study tries to highlight the series of design procedures necessary both in the preliminary phase and then in the executive phase to relate the GSI to the existing building envelopes. The GR, from the results of the simulations conducted, demonstrate a greater simplicity in their construction, with improvements also from the point of view of the working loads on the existing structures, since the interventions are performed more easily than those on the facade. The study highlights the architectural needs that are not always considered such as the increase in the thickness of the roof and the related need to raise its edges, changing the perspective of the building. On the other hand, the GW and the LW show some complexity in their construction because they must deal with facades often rich in decorative elements and where openings affect the assemblage and connection works such as the tinsmiths of the intrados of the openings. It must be taken into consideration the necessity of having to drill masonry, often inhomogeneous, to connect fixings and the problems of stability this entails must be carefully analyzed.

The Djebel Amour region, located in the Western Saharan Atlas of Algeria, hosts a vernacular mosque heritage that remains largely unexplored. This study presents the first comprehensive typo-morphological analysis of fourteen mosques dating from the 11th to the 20th century. Their original architectural state was reconstructed through the triangulation of field surveys, archival documentation, iconographic sources, and oral testimonies. A reference model based on four recurrent components—the prayer hall with its mihrab, courtyard, portico, and minaret—enabled the identification of typological constants, contextual variations, and vernacular constructive logics. The results reveal the persistence of sober and functional forms, marked by the frequent absence of a courtyard and the presence of skiffa-inspired porticos and staircase minarets. A complementary quantitative component strengthens cross-regional comparisons and situates the Djebel Amour corpus within wider North African, West African, Middle Eastern, and Southeast Asian vernacular mosque traditions. Beyond architectural reconstruction, this study develops an operational framework for conservation and transformation management, supported by a structured database that systematises typological, material, and construction data. While the analysis relies primarily on photogrammetric documentation, the proposed framework is compatible with international digital standards and can be expanded through methods such as 3D laser scanning, drone-based surveys, or geospatial modelling. By integrating qualitative, quantitative, and digital perspectives, this research offers practical tools for heritage authorities, local administrations, mosque committees, architects, designers, and conservation practitioners, positioning the Djebel Amour mosques as a reference model for sustainable heritage management and contextual adaptation in arid and tribal environments.