This article introduces ethnographic upscaling, an innovative procedure to explore and test hypotheses drawn from in-depth ethnographic findings in spatially continuous cases. The approach combines the strength of localized ethnographic descriptions with questionnaire-based regional surveys to study the distribution of ethnographic findings across social groups by comparison. The approach was designed in the Local Institutions in Globalized Societies project. This anthropological long-term research project ran from 2010 to 2019 to explore institutional regimes for managing water in arid Namibia. The article describes how the ethnographic upscaling approach was developed and implemented, discusses some exemplary results, and offers a critical reflection on its shortcomings and potentials.