Residents typically have a negligible impact on their living units spatial layout in mass housing projects. Building industry lacks tools for users to create space tailored to their needs. The purpose of this work is facilitate co-creation by providing a pre-configured and engineered set of spatial units corresponding to human activities, in order to lower the technical threshold for participation in the design process. This set provides an accessible search space for modular solutions allowing for free aggregation of space by people without an architectural background. The methodological approach used in this work was Design Science Research.