This article aims to analyze the production and access to urban resources in a context of migration. Urban resources are treated as devices and practices that are constitutive of the urban environment. To characterize them, we target groups of South American migrants, workers and small employers inserted into the sweatshop economy. We will see how, in a metropolitan context where international migrants face difficulties entering the labor market and access to housing, workshops are organized by re-using urban fabric elements, namely certain frame configurations, and produce their own supply of housing to labor, to guarantee its cheapness and productivity. Therefore, workshops system is a user as much as a producer of specific urban resources.