The increase in one-person households is regarded as a manifestation of the process of social individualization that strengthens individuals’ ability to make lifestyle choices to the detriment of certain social institutions. However, the background circumstances to solo living can vary widely and often stem from structural determinants, such as gender inequalities, within the framework of a highly competitive society. This article analyses the nature and social significance of solo-living in Spain through a case study of young adult women (25–45 years of age) residing in an urban environment (Barcelona and Jaen). The analyses focus on aspects connected with the theory of social individualization (e.g. the demands of working life and expectations regarding life partners, motherhood and social relations). Four different profiles of women can be distinguished in the results: ‘cosmopolitans’, ‘unconditionals’, ‘empowered’, and ‘temporaries’. In broad terms, the interviewees’ narratives bear witness to the process of individualization (self-realization with which to engage in a personal life project), although tensions come into play between personal expectations and the demands of working life, especially in the spheres of sexual partnership and motherhood.