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SummaryCyber physical systems are complex systems to build and implement, electronic devices and concepts such as the energy saving, the user comfort and the privacy of sensitive data. In the physical world, buildings represent a major part of total energy consumption, that's why improving the energy efficiency levels of buildings is topical by which the emergence of smart buildings. Since, even if efforts are being made in normalizing the process of energy saving management while maintaining a high level of users' comfort, managing the access control in smart buildings systems remains an ad‐hoc process. This is why a number of researches focus on the design and implementation of solutions aimed at covering the process of access control management. In the context of developing a smart building application, already developed in our laboratory, we have set up an access control management system to manage users' access. We present the design of an access control architecture, using the Unified Modeling Language, upon the smart building application which is the subject of a maintenance work. The designed solution is implemented with the purpose of evolving the application to be used by multiple users. The implemented access control solution is an extended role‐based access control model.