Experiences of autonomy, opportunities for appropriation, social contacts, opportunities for co-determination and creativity and experiences of nature are all important elements in a child's development. Everything takes place in spaces. Children identify with spaces and have their first experiences of self-efficacy. However, child-friendly living spaces are not just living spaces for small people. Because what is important for children also benefits other generations. The handbook uses basic principles, checklists and an accompanying online collection of case studies to show how this can be achieved.