The focus on sustainable development and building performance emerged as early as the 1960s, but the recent scientific literature argues that it is necessary to adopt a point of view that considers the interaction between buildings and their surroundings, as well as the influence of transport systems, energy production, resource distribution and waste management on urban sustainability. Therefore, various methods, techniques and tools for assessing urban sustainability have been developed in order to understand how cities can become more sustainable. Among these, the thesis proposes to investigate NSAT because they are the most complete tools. These include both qualitative and quantitative aspects and overcome the environmental focus by opening up to the modern definition of sustainability.