Amid continued growth in the building stock, the pursuit of sustainable buildings is dominated by a focus on carbon neutrality and green, often overlooking resource consumption and its contribution to greenhouse gas emissions and planetary degradation. Accordingly, this article seeks to highlight the importance of a resource-efficient built environment, which enables required functions to be delivered with less assets, and to put forward an approach toward this objective. In this regard, the circular economy (CE) concept seeks to extract more value from resources by using them for as long as possible, thereby increasing economic prosperity and employment while reducing waste, greenhouse emissions, and pollution. Thus far, application of CE principles has largely concentrated on the industrial sector, such as through industrial symbiosis and its extension to urban symbiosis/metabolism. Their application to cities and, in particular, the built environment has been limited and the body of literature is relatively undeveloped. Insight is offered into how this field of research might be developed and applied to enable a more resource-efficient, low-carbon built environment with socioeconomic benefits. It reviews literature on the CE and industrial ecology, their application to industrial and urban contexts, and the gaps pertaining to the building sector. A proposition for extending research and its application to the built environment is then put forward, encapsulated in a conceptual model. This is seen as an important first step in influencing policy makers and repositioning resource efficiency firmly on the sustainable and carbon neutral building agenda. Keywords:asset management carbon neutrality circular economy industrial ecology sustainable development urban development Conflict of Interest Statement:The authors have no conflict to declare.

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While the Circular Economy in the built environment is often viewed in terms of recycling, more value can be obtained from buildings and physical components by their reuse, aided by stewardship and remanufacture, to ensure optimum performance capability. The use of cyber-physical information for online identification, examination and exchange of reusable components may improve their life-cycle management and circularity. To this end, a bi-directional data exchange system is established between physical building components and their virtual Building Information Modeling (BIM) counterparts, so that their life-cycle information—including history of ownership, maintenance record, technical specifications and physical condition—can be tracked, monitored and managed. The resultant prototype Cloud-based BIM platform is then adapted to support an ongoing product-service relationship between suppliers/providers and users/clients. A case study from a major new hospital, focusing upon an example of internal framed glazed systems, is presented for ”proof of concept” and to demonstrate the application of the proposed method. The result of the case study shows that, informed by the life-cycle data from the Cloud-BIM platform, a “lease with reuse” service option is able to deliver a lower total cost and less carbon intensity for each unit of frame-glazed module. This leads to a higher level of eco-efficiency, coupled with decreased consumption of material resources and reduced generation of waste. The research is expected to serve as a step forward in the era of Industry 4.0 and illuminate a more sophisticated way to manage building assets.