The increasing number of older persons living independently, in parallel with the considerable number of individuals with chronic diseases or disabilities, in addition to the evolution in sensors/actuators technologies, wireless communication and cloud storage have empowered the idea of new smart home systems (SHS). These systems help to keep individuals safe, to assist them in controlling home appliances, and to inform their relatives and the medical staff about their status. Although various types of SHS already exist, they are environment dependent and scenario specific. Therefore, the aim of this paper is to propose sensors/actuators and scenarios independent flexible context aware and distributed SHSs based on standardized WSN and service ontologies as well as multi-agent architecture