A new role entrusted to architects today is to develop design tools, known as generative design systems, which have in common concerns such as productivity and variety, aiming at formal innovation. One of the paradigms used for the generation of forms is shape grammar, which is based on the definition of a vocabulary of forms and rules of combinations and operations between them. Shape grammar can be used both for the description of existing languages and for the creation of new compositions. In this case study, a grammar with these two purposes was developed, from a corpus of analysis. The corpus was composed of façades of historic buildings from Monte Alegre do Sul downtown. The small town, founded at the end of the nineteenth century, was chosen because it maintained its original characteristics and it buildings suffered very few interventions over the XXth century. The grammar developed describes the compositions of all the façades in the group. We expected that this grammar can be used as a guide for future renovations of other buildings in the town.

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