This article examines the window of opportunity concept and its implications for police officers’ and social workers’ perceptions of abused women’s agency. The study consists of a qualitative analysis of semi-structured interviews with eight police officers and eight social workers who have worked according to the so-called Icelandic model. This model is based on the assumption that a window of opportunity exists. It is thus a relevant case for analysing the concept’s implications for practical work with and support of abused women.We found that the empirical basis for the window of opportunity concept was meagre. However, the professionals working with domestic violence thought that the concept was relevant, useful and in accordance with their experiences. During the time period they perceived as the window of opportunity, they attributed agency to abused women, and considered it important to offer support before the window closed. At the same time, they tended to underestimate women’s agency, and viewed a choice not to accept support as a sign that the woman had returned to the abuser.