Colour is a fundamental aspect of our visual experience, playing a crucial role in the way we perceive and interact with our surroundings, which is particularly important when applied to architecture. It is known that colour influences us physically and psychologically, provoking sensations and emotions, and influencing behaviours and choices. It, also, models the surrounding landscape, transforming the appearance of the cities and public spaces. Nowadays, one of the focus areas in cities’ planning is public housing and the importance that colour assumes in terms of spatial quality, issues of belonging, inclusivity, identity and non-segregation. Often, the chromatic options are based on aesthetic criteria, personal preferences, fashion, or even a “Authorship work”. Besides, these are neighbourhoods built with limited budgets, using reduced building materials of poor quality, so the tendency is to apply colour as a way of enriching the architecture, but not always based on criteria supported by colour knowledge. Therefore, chromatic plans for social housing neighbourhoods, it’s an important tool for their integration in the surrounding environment. Considering the case of social neighbourhoods, this paper aims to underline that the spatial transformations and the impact of colour on its users are relevant issues, both in terms of architectural requalification and new public housing projects, which is why colour planning is fundamental among the various aspects to be taken into account in social housing projects.