According to UN Habitat, 113 million people live in informal settlements in Latin America. This project targets the most fundamental problem of these communities: the lack of quality and habitable conditions in their homes. After analyzing their idiosyncrasy, a system of progressive and modular architecture was developed. Modules of 3x3m could be placed together and combined giving multiple possibilities to families of deciding the shape of the houses. Furthermore, by being progressive, the family could keep adding more modules and spaces over time as their necessities and resources grow.