Figure 2.5 Diagram of design concepts impact

architecturally designed, unfunctional, uncomfortable and not economically feasible. Or, we cannot have a building which is economically justifiable, while it is not environmentally friendly. Therefore, the integration of the three main aspects of the sustainability in the buildings` design and their fulfilment to the best values possible, ensures a successful delivery of a sustainable building.

Regenerative design

In addition to the concept of sustainability, the regenerative concept has been promoted. We've seen that the sustainability is based on doing less harm to the environment and using less resources, while the regenerative concept is defined as enabling social and ecological systems to maintain a healthy state and to evolve [25]. The intent of the regenerative design is to deliver building that is adapted to and utilizing the potential of the natural and climatic context while creating synergistic relationship between the climate, ecosystems and human life[26].

For comparison, we can notice the difference between the following concepts[25], such as:

 Sustainability is based on limiting the buildings` impact onto the environment and to reduce the negative implications of the resource consumption to acceptable levels.  Restorative means that there is a positive impact onto the social and ecological systems and they are returned back to a healthy state.  Regenerative means enabling social and ecological systems to maintain a healthy state and to evolve.

Figure 2.5Diagram of design concepts impact[25]

Circular economy

The circular economy is an economic model promoting a closed loop system of resource consumption aiming to minimize waste while promoting re-use, recycling and protection of resources. This concept can be applied in the construction industry on different scales, such as on a product level and the production of construction materials, as well as on a building-