Urban spaces are pervaded by interpretive and reactive technologies that shapeand are shaped by its inhabitants, with an increasingly active role for citizen technologists.Yet the role of domestic spaces in shaping lived experience within the urban environment, and subsequent technological interventions, is often overlooked. Homes are framed as closed-off environments which isolate their inhabitants from the city, despite being porous spaces that are also filled with ubiquitous computing. In this paper we draw on the participatory design and user innovation literatures to present the methodology for the “Homesense” research project that explored how users design and develop “smart”technologies within their own homes, based on the intersection of their concurrent urban domestic lived experience. Kits of open-source hardware were used as cultural probes, and co-located “lead users” provided technical expertise. This methodology demon-strates the importance of physical space and location in user-led domestic activities, and of combinations of technical and “lived” expertise in developing these interventions