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h i g h l i g h t sA new cost-benefit method was developed to compare building solutions. The method considers energy performance, life cycle costs and investment willingness. The graphical analysis helps stakeholders to easily compare building solutions. The method was applied to a case study showing consistency and feasibility.

A brief analysis of the environmental, social and economic paradigm of today's cities, allows a simple conclusion to be reached: current cities are not sustainable. Considering this, it is very important to study the causes of city problems and to develop city models implementing sustainability practices. There are a limited number of studies developing sustainable city models, but in the scientific community there is an even greater lack of studies about the rehabilitation of current cities to implement these models. This work emerges with the objective of analysing how it is possible to implement sustainability practices in cities through the development of a sustainable city model and an urban rehabilitation plan. The development of sustainable city models is a very complex topic and the analysis of the literature shows that it is necessary to consider the relation between environmental and social aspects in the development of sustainable cities, while taking special care when considering the economic issues. It was also concluded that sustainable city models and rehabilitation plans should be subject to sustainability assessments and should consider the active participation of the city inhabitants. In fact, a city can only be sustainable if its population is in harmony with the city model and we can only assess results by predicting and measuring performance levels.

Architectural design is often associated with aesthetics and style, but it is also very important to building performance and sustainability. There are some studies associating architectural design to the choice for materials from sustainable sources, to indoor air quality, to energy efficiency and productivity. This article takes a step further to analyse how the use of efficient interior design techniques can impact the habitable space in order to improve building sustainability in land use. Smart interior design, a current trend related to the use of efficient and flexible furniture and movable walls in tiny or compact apartments, is analysed. A building with a standard design is used as a case study reference building and compared to a proposed theoretical design alternative using smart interior design techniques. In order to correctly assess sustainability performance, a quantifiable and verified method is used. Results showed that the use of smart interior design techniques can greatly reduce buildings' impact on the environment.