A digital twin is a virtual representation of real-world assets and phenomena. It is a federated entity of synchronised data streams that give us situational awareness of what is happening and why it’s happening. The end-user can then determine what might be the results of the phenomena. Digital twins are sophisticated tools for educated decision-making. They are an emerging digital operations platform in which the end-user has the choice of which components are relevant for their digital twin experience and the decisions they are about to make based on the data and evidence provided through a digital twin. A digital twin is as good and as reliable as the data connected to it. The data components connected to the digital twin must be the actual digital replica of what they represent. Placeholders and ‘alike’ components have no use in digital twin because they make the situation misleading. A digital twin has several use-cases. It allows us to simulate and animate our physical environment’s technical and social performance based on real-time data. It enables us to analyse how our environment performs in daily operations and what are the short-term or long-term implications of that performance. A digital twin supports our design processes, construction operations, seamless handover, proactive maintenance, and predictive operations planning by visualising multiple data streams in a single system that can be interpreted by a human or decoded by a machine. Over time digital twins become a representation of different types of data and information, spanning disciplines and life cycle phases for our assets. As the world faces numerous challenges, a renewed approach to designing, constructing, and managing the built environment will be crucial, making the principles and concepts discussed in this paper even more relevant. The sector and the profession will be able to use digital twin systems to deliver constructed assets that are economically viable and socially and environmentally positive for current and future generations. RICS professionals are bound to play an ever-important role in developing, deploying, and using digital twins.