Children’s participation in planning has been investigated to some extent. There are, however, unexplored topics, particularly concerning what is needed for children’s participation to become a regular process. Based on case studies in Sweden, this article draws some conclusions. It is quite possible to organize ordinary processes where children participate in community building, in collaboration with planners, as part of their schoolwork. The key question is how this can be done. Clearly, it needs to occur in close collaboration with teachers and pupils, however it also needs to be implemented in a system-challenging manner. Thus, rather than looking for tools with potential to work in the existing school and planners’ world, it is important to design research that aims to create learning processes that have the potential to change praxis. Hence, it is not the case that tools are not needed, rather that children need to help to develop them.