Remarks on the green retrofitting of historic buildings in Italy

• Discussion about the significance of green retrofitting in cultural heritage buildings.
• Description of original experienced tools for pre-design investigation of ancient buildings.
• Description of original experienced methodologies for an environmental monitoring.
• Discussion about fallouts of green historic buildings in the real estate market.

Latest European Union programs related to energy efficiency underline the need for retrofitting existing buildings, which are responsible for 40% of EU final energy consumption. Although new buildings can be constructed with high performance levels, the majority of the building stock, characterized by a low energy performance, still needs renovation. Thanks to its potential to deliver high energy and CO2 savings, green retrofitting of existing buildings can thus play a pivotal role in creating a sustainable future. In this context, interventions on buildings constructed before 1945 (commonly defined as “historic buildings”) mean a higher benefit/cost ratio, because, in many cases, green retrofitting can be linked to unavoidable refurbishment works and renovated buildings can take on an interesting market value. However, an important part of these historic buildings in Italy is composed of cultural heritage buildings; these buildings require a specific design approach, and green retrofitting is often not attractive from an economic point of view. The remarks reported in this work aim to stimulate a discussion on operational procedures, barriers and challenges that investors, professional figures and supervisory authorities can encounter when they are engaged in the green retrofitting of historic buildings belonging to Italian cultural heritage.