###### Abstract  
This study investigates the integration of Building Information Models (BIMs) and Virtual Tour (VT) environments in the Architecture, Engineering and Construction (AEC) industry, focusing on Computer-Aided Facility Management (CAFM), Computerized Maintenance Management Systems (CMMSs), and data Life-Cycle Assessment (LCA). The interconnected nature of tasks throughout a building's life cycle increasingly demands a seamless integration of real-time monitoring, 3D models, and building data technologies. While there are numerous examples of effective links between IoT and BIMs, as well as IoT and VTs, a research gap exists concerning VT-BIM integration. This article presents a technical solution that connects BIMs and IoT data using VTs to enhance workflow efficiency and information transfer. The VT is developed upon a pilot based on the Controlled Environments for Living Lab Studies (CELLS), a unique facility designed for flexible monitoring and remote-control processes that incorporate BIMs and IoT technologies. The findings offer valuable insights into the potential of VTs to complement and connect to BIMs from a life-cycle perspective, improving the usability of digital twins for beginner users and contributing to the advancement of the AEC and CAFM industries. Our technical solution helps complete the connectivity of BIMs-VT-IoT, providing an intuitive interface (VT) for rapid data visualisation and access to dashboards, models and building databases. The practical field of application is facility management, enhancing monitoring and asset management tasks. This includes (a) sensor data monitoring, (b) remote control of connected equipment, and (c) centralised access to asset-space information bridging BIM and visual (photographic/video) data. t 2024 30 August 2024 30 August 2024 30 September 2024 30 August 2024 30 August 2024 30 September  
as well as subsequent tasks throughout the building's life cycle, such as Computer-Aided Facility Management (CAFM). The latter is enabled through the use of Computerized Maintenance Management Systems (CMMSs) and other digital tools, including the Internet of Things (IoT) and Virtual Tours (VTs) [7; 8]. Although these technologies emerged for different purposes, the natural workflow connecting tasks along the building life cycle increasingly demands their integration. This article describes a technical solution connecting BIMs and IoT data using VT environments and tools. To explain the need and framework of the present technical solution, below is a brief description of the different technologies and their current use throughout the building life cycle concerning the exploitation phase (i.e., facility management and CAFM). **BIMs and visualisation tools. ** The purpose of Building Information Modelling (BIM) and the resulting Building Information Models (BIMs) is to link 3D virtual geometry and alpha-numeric information related to building and construction. The AEC industry increasingly adopts BIMs as a means of communication among the disciplines implicated (i.e., architects and engineers). In turn, BIM methodologies provide these disciplines with protocols and tools aiming at the effective transfer of information along the design and construction phases. This includes uses such as budget control, construction planning and quality control [1; 9; 10; 11]. Standards have been implemented in most AEC associations, helping define professional frameworks [12], the classification of construction elements into digital entities (i.e., Industry Foundations Classifications (IFC) [13], and the definition of levels of detail each model must provide according to the required usage and development phases [14]. These standards define Levels of Detail (LOD), which result from the combination of the Level of Geometry (LOG) or the level of detail of the model's 3D objects, ranging from LOD 100 (global volumes) to LOD 500 (including specific constructive elements like screws or door handles).