This article investigates the development of urbanism and architecture at the site of Sala (Chellah), from the end of the first century BC to the latter half of the second century AD. By looking at the transformations in the town's civic centre from the Mauretanian to Roman imperial period, the aim is to assess how the layout and function of public spaces and buildings were reshaped to respond to new ideas of monumentality. A range of research methodologies are applied to address this question, including architectural, archival, and archaeological analyses, as well as the use of 3D digital modelling. The case study of Sala is of particular importance, as it shows how certain pre-Roman monuments were kept in use within new public contexts, and how imperial-style, urban and architectural features were introduced in the town as part of trends that can be recognized across North Africa and the Roman Empire more broadly.