In building conservation projects, the impact of modernity on a delicate ecosystem such as that of the ‘Sassi of Matera’ can take on destructive aspects. There are many studies from which it can be deduced that there is a need to address recovery, re-functionalization and infrastructural integration, through the understanding of the urban environment and the opportunity to define a cultural orientation, that should be a sort of code of conduct that allows us to re-inhabit this architectural heritage. When giving new life to structures it is essential to respect the needs connected with modern living, but without altering their consolidated character over time, with interventions related to the original constructive, typological, functional and technological characteristics; at the same time, it is necessary to give particular attention to the integration and sustainability of the new interventions. This is the case in the reconversion of an urban context such as Matera; this city currently presents the image of a contemporary Matera, European Capital of Culture 2019, deeply involved in sustainable management and maintenance, a ‘smart’ city, and a symbol of restoration and historical heritage.

Low-accessible Cultural Heritage, including hypogeal sites, rupestrian architectures, and fragile structures, represents a major challenge for conservation, documentation, and continuous monitoring. These limitations stem from multiple inaccessibility factors, classified as physical (morphological complexity), asset risk (microclimatic instability), health and safety (structural vulnerability), managerial (lack of public access), and cognitive (lack of documentation). This research aims to transform digital models from mere representational tools into integrated cognitive and operational systems supporting decision-making and preventive conservation. The proposed methodological workflow is structured into five main phases: Preliminary Knowledge and Multidisciplinary Data Structuring (Ph1. PK–MDS), Comprehensive Digital Survey (Ph2. CDS), Development of Integrated Digital Models (Ph3. IDMs), Advanced Diagnosis and Monitoring (Ph4. ADM) and the implementation of an Integrated Digital Environment for Hypogeal Heritage Management (Ph5. IDE). Ph4 operates on two complementary scales: at the site scale, range-based point clouds enable the semi-automatic identification of extensive decay patterns, such as biological colonization. At the detail scale, the Random Forest algorithm enables the segmentation and quantification of material loss on frescoed surfaces through a diachronic comparison of historical and current data. Validated on the San Pellegrino complex in Matera, selected as a paradigmatic case study of low-accessibility hypogeal sites, representative of a broader system comprising approximately 150 rupestrian cult architectures, the methodology demonstrates how immersive digital environments function as shared knowledge spaces, supporting more informed, inclusive, and resilient heritage conservative management.

Placed as a hinge between analysis and decisions, the diagnosis involves interpretations on whose correctness may depend the restorations’ outcome and the building’s future life. In the diagnosis’ context, an important role is played by the knowledge of the restoration interventions’ history and investigations in order to orient new diagnostic investigations and to compare data acquired at different times with the aim to integrating them and discovering constructive and structural variations occurred. This integrated methodology aspires to multiple objectives including the design of a new investigation plan made reliable and effective through ‘archival diagnostics’. In this sense, archival research stands as a means of adding information on the conservation history and degradation, representing a useful diagnostic tool. Hence the intention to begin a reasoning on the added value that the anamnesis and diagnosis based on archive data can provide from a cognitive and design point of view.

The paper is focused on the historical-architectural evolution and material-technical qualification of polychrome majolica domes that were built between the 17th and 19th centuries in Apulian religious buildings. In particular, the cultural context in which this solution spread throughout the Mediterranean area is identified. Moreover, the case history of construction and decorative techniques that are distinctive of the regional territory is discussed in terms of underlying structure, installation of elements and surface colours. The study is then detailed on the Church of Santa Maria della Vetrana in Castellana Grotte (BA), for which the morpho-typological survey and mapping of the decay state are presented, based on the use of terrestrial and aerial digital photogrammetry. Finally, based on the identification of the main pathologies from both direct and indirect alteration factors, the most appropriate conservation and maintenance interventions are outlined, with specific focus on repair and integration of the majolica tiles, according to principles of high compatibility and low intrusiveness for a solution meeting artisan tradition and technical practice.