Decades of sociological research consistently find that women do more housework than men. However, existing research almost exclusively focuses on families and couples, thus overlooking non-familial households and the life stage of young adulthood. In this paper, I offer an alternative setting for studying gender inequality in housework - shared living households where people live together but do not share romantic or kinship relationships (i.e., "roommates"). Using a nationally representative sample from the American Time Use Survey (2003-2019), I describe young adults' housework investment by type of living arrangement, paying particular attention to the household's gender composition and type of housework task. Specifically, I ask whether living with men roommates is associated with more housework investment for young adult women in the US. The results suggest that gender organizes housework time for young adults, mainly cleaning – young adult women invest more time cleaning than young adult men across all living arrangements. However, women living with men roommates did not invest more in housework than young adult women in other living arrangements. The results suggest that the contractual roommate relationship does not promote equality or prevent "doing gender." However, it does hinder an intensified gender display. Meaning, housework in roommate households may not carry a meaning of caring and love, but it is still charged with gendered expectations, albeit being a non-familial context.