The construction sector is one of the most polluting in the world. The increase in sustainability of the sector passes through the management of the existing real estate in terms of renovation and efficiency. The problem is particularly evident in Sardinia Island, owner of a largely obsolete and inefficient real estate stock. In this context, BIM (Building Information Modeling) represents the tool to improve the efficiency and quality of the processes of design, construction and management of public works. However, to date, interoperability between software related to the various process elements - architectural, structural, plant engineering, etc. - does not seem adequate. This paper analyzes the level of interoperability between three software for the creation of the BIM model and a structural modeling and calculation software with reference to a reinforced concrete building representative of the Sardinian real estate stock. The results highlight the critical issues still present in the process of exporting and importing models between the various software, which prevent the full effectiveness of the BIM approach. The implications of these aspects on the construction sector in Sardinia are illustrated and discussed.