| Existing government policies and regulations are not supportive | | | | | | |
| Lack of incentives (eg, subsidies, tax breaks) | | | | | | |
| components or building materials are more expensive to procure than new products | | | | | | |
| components or building materials are more expensive to maintain than new products | | | | | | |
| Existing business models do not support circularity | | | | | | |
| Lack of availability of components or building materials | | | | | | |
| Lack of market demand for components or building materials | | | | | | |
| Lack of adequate financial resources | | | | | | |
| Lack of skills and competence to implement circular practices | | | | | | |
| Lack of willingness of stakeholders to adopt circular practices | | | | | | |
| Lack of adequate collaboration between stakeholders | | | | | | |
| Difficulty integrating with existing technologies, products, and practices (ie, lack of compatibility) | | | | | | |
| Lack of adequate innovations in products and practices (e.g., using technology to upcycle/downcycle used materials and business models to support it) | | | | | | |
| Lack of adequate storage facility for circular products | | | | | | |
| Difficulty of the sector to adapt to evolving National/European policies and regulations | | | | | | |
| Immature or fragmented supply chain for circular products | | | | | | |
| Lack of adequate time to plan and implement circular practices | | | | | | |
| A general sense of insecurity or uncertainty in adopting circular products and practices with consequential outcomes | | | | | | |
| Others | | | | | | |