The thesis deals with ethical dilemmas that the author identified during the process of transformation of residency social care facilities. The aim of the work is to theoretically describe dilemmas identified and subsequently outline the procedure for their solution. The aim of the core part of the work, where is selected dilemma discussed using two ethical theories, is to point out the way these theories can help to solve the ethical dilemmas. The work is divided into five parts, the first of which defines the concepts, the process of transformation and the specifics of the target group of persons with mental disabilities. In the second part emphasises the role of the social worker in dealing with ethical dilemmas and the author generally deals with ethical problems and dilemmas from several points of view and addresses the question of responsibility of a social worker for the ethically-based decision in the specific situation of transformation. The third section describes the specific ethical dilemmas that have been identified during the transformation process, including identifying possible solutions. In the fourth part is the one selected ethical dilemma discussed with the aid of two ethical theories, deontology and consequentialism. In the final fifth part, the discussion, is thinking about benefits and the real possibilities of using ethical theories in social work practice and their meaningful link.