This study aims to develop a sort of expert system to simulate Internet of Things (IoT) service in
architectural design alternatives and enhance the simulation performance using building information. The
proposed protype system, named iotBIM, visualizes human behaviors and IoT services in a virtual place
that is automatically generated from among design alternatives. We use commercial building information
modeling (BIM) authoring tool for the development of iotBIM. The decision to develop iotBIM on the
BIM platform was made because BIM tools already generate precise 3D models of design alternatives;
iotBIM is plugged into the BIM tool as a simulation module. In the midst of the design process, architectural designers can activate iotBIM to investigate and establish IoT services that accord visually with
design alternatives. The purpose of this study is to provide a theoretical and technological basis for the
ultimate goal of this study.