The work for sustainable development is something that requires a joint commitment from all countries and corners of the world, where public libraries can also contribute. This study examines how librarians perceive the conditions of public libraries in the work for sustainable development, and how the conditions need to change in order for this work to develop. The study applies a quantitative approach in the form of a questionnaire survey aimed at librarians at public libraries in Sweden, where primarily a quantitative statistical analysis but also a qualitative content analysis was performed on the collected data. Furthermore, the framework The three spheres of transformation was used to create a deeper understanding of how these conditions could be understood based on the personal, political and practical spheres. The results show that the librarians participating in this study perceive the conditions to work for sustainable development as quite good based on the finding that eight out of eleven studied factors were rated highly. The results also show that the librarians believe that all factors need to change in order for this work to develop. Thus, it can be stated that the role and work of public libraries for sustainable development has the potential to expand even more.