In most fields of social work practice, trust between the professional and the service-user is understood as a fundamental postulate of the helping relationship. However, from the point of view of both common sense and the relevant literature, trust is not a given, but a practice of accommodation to be constructed, of which the determinants and conditions of implementation must be identified. How do social work professionals go about establishing a trust relationship with service-users in their fields of practice? This article presents the results of a qualitative research aimed at answering this question in two social work fields of practice: assistance to refugee women victims of sexual violence, and adult guardianship. The results highlight the accommodation practices of the professionals interviewed, which are in line with both the practice contexts and the realities of the service-users, by combining and relying on a set of knowledge, know-how, and interpersonal skills that enables the emergence, construction, and maintenance of trust in the relationship between the professional and the service-user.