This paper discusses the idea of multiplicity as a spatial strategy employed in a shared domestic open space in a traditional setting. The discussion proposed to position outdoor space as a productive setting of a domestic, an integration of working and living, rather than a private domain that serves only for a specific function. Multiplicity as spatial strategy arguably shows how open space of domestic shifts from such a fixed and prescribed entity to multilayered spatial configurations with overlapped functions. By employing the perspective of everyday, this study uses a case to reveal multiplicity as the spatial strategy conducted by a roof tile-producing family that operates traditionally in Temanggung, Central Java, Indonesia. Based on field observation and interviews, three forms and spatial configurations constitute the domestic open space - the boundless, pocket, and interstitial spaces. Followed by further mapping of the traces of activities and objects, the multiplicity as spatial strategy is shown through the prevailing multi-layers of occupations within the shared open space - the layers of production, internal-domestic, and social and leisure, which fluidly overlapping without strict boundaries. Such arrangements show that multiplicity can be seen as a spatial strategy developed based on relations of process and spatial conditions within a spatial and temporal arrangement. It arguably expands the idea of domestic outdoor space through its capacity in accommodating various possibility ways of doing at a time within a given physical arrangement. The findings suggest a spatial strategy benefit despite the limited spatial setting, providing a basis for programming domestic architecture. © 2024 Author(s).