This research proposes a smart home automation system framework using a heterogeneous subsystem approach. The proposed system consists of several subsystems such as fire management, audio communication, automation, and surveillance, which are integrated and managed by a central home server application. The system also incorporates an ECA rule mechanism for communication among the subsystems and a database module for handling queries and storing information in a structured manner. The access control of the subsystems is managed by the surveillance subsystem. The service level application module is implemented to execute the events and provide appropriate responses to the user. To test the proposed system, three subsystems were selected, namely fire management and alarm system, audio communication system, and automation subsystem. The system was tested using a home and LAN server, and the results showed that the proposed system was efficient and effective in handling various events and providing appropriate responses. The system demonstrated a fast response time and was able to handle complex events in a sequential order.