###### Abstract  
Virtual reality (VR) technologies have advanced rapidly in the past few years, and many industries have adopted these cutting-edge technologies for diverse applications to improve their industrial competitiveness. VR has also received considerable recognition in the architecture, engineering, and construction industries, because it can potentially reduce project costs, delivery time, and quality risks, by allowing users to experience unbuilt spaces before breaking ground, resolving construction conflicts virtually, and reviewing complex details in immersive environments. In the real estate market, VR can also play an important role in affecting buyers' housing purchasing decisions, especially for housing markets in Asia, where the pre-sale system is extremely common. Applying VR to the pre-sale housing system is promising, because the concept of pre-sale refers to a strategy adopted by developers that sell housing through agreements on residential units that have not been constructed yet, and VR at this stage could be a useful tool for visual communication in a true-to-scale environment. However, does VR really benefit sales in the housing market? Can clients accept using VR, instead of using traditional materials (i.e., paper-based images and physical models), to navigate and experience housing projects? The objective of this study is to develop a VR-based navigation system for a pre-sale housing project in Taiwan. We invited 30 potential clients to test the system and explore the implications of using it for project navigation. The results reveal that VR enhances the understandings of a project (perceived usefulness) and increases clients' intention to purchase, while the operation of VR (perceived ease-of-use) is still the major challenge to affect clients' satisfaction and the developer's acceptance with respect to applying it to future housing sales.  
virtual reality (VR); housing sales; pre-sale system; technology acceptance model (TAM) 2018/09/2018/18/09/2018/18/09/2018/09/2  
VR has also received considerable recognition in the architecture, engineering, and construction industries [15]. At the stage of architectural design, VR can enhance the comprehensibility of the design, effectively check design conception and program development, and solve the problem of pipeline collisions in real-time [16; 17]. During construction, VR can present information about it in advance with visual design intention and design effect. By mastering the construction methods and specific construction materials, it integrates and reviews the project interface, so as to improve construction efficiency [1]. However, research on VR applications to the sales end is sparse from the perspective of the construction lifecycle. Can VR more effectively promote the rate of pre-sale housing sales in Taiwan than the traditional housing sales model? As to the introduction of VR, will general purchasers and housing developers resist its implementation? These questions are the focus of the housing industry in recent years.  
The objective of this study is to develop a VR-based navigation system for a pre-sale housing project in Taiwan. In order to verify the practicality of the system, this study takes an actual pre-sale housing case as an example, and invites 30 subjects to experience the VR-based system. We then make a comparison between the VR-based system and the general navigation system for pre-sale housing. Technology acceptance model-based questionnaires are designed for the experiment to understand customers' attitudes, intention, preferences, and differences of usefulness and usability when using the two systems. The results and expectations are expected to be helpful for future developers importing a VR system.