Guidelines for the Restoration of ALER (Azienda Lombarda Edilizia Residenziale) Building Heritage in the Context of HBIM

The ALER Institute (Azienda Lombarda per l’Edilizia Residenziale), founded in the early 1900s due to significant immigration driven by Milan's industrialization, has played a crucial role in addressing housing needs. ALER Milan developed a public housing stock unmatched in Europe, with approximately 70,000 owned dwellings, and an equal number alienated over time. Guided by the mission "to provide hygienic and affordable housing for the less affluent classes," ALER has significantly impacted Milan's socio-urban landscape. To improve energy efficiency and sustainability, the Minimum Environmental Criteria for Building (CAM) were introduced in 2017. The collaboration between ALER, the Politecnico di Milano, and the Soprintendenza ai Beni Architettonici led to guidelines for interventions on historic buildings over seventy years old. Rooted in BIM methodology, these guidelines offer a structured approach for managing or upgrading assets, considering funding opportunities and intervention urgency. They direct design and preliminary activities toward achieving clearance without replacing existing procedures. The guidelines address material degradation and thermal dispersion for historic buildings and structural vulnerability for less valuable ones proposing pre-intervention analyses and simulations based on the BIM model. Innovation lies in shared processes between authorities and contractors, utilizing digital HBIM procedures. Case studies, like the block building on Via Lulli and the Pirelli neighborhood, demonstrate the applicability of these methodologies. The process promotes sustainable and structured management, aiming for replication in other regions and entities.