This paper summarises an evaluative case study of a large newly built housing area framed by older inner-city buildings in Stockholm. It departs from the conditions for youths and children here. The study reveals that the separation of traffic within the area is a much appreciated quality. At the same time, the lack of schools within the area means that children's routes to school often go through neighboring older sections of the city where traffic is experienced as a risky factor. This is also the case when staff with groups of children visit the attractive green areas outside the housing estate. The density of the buildings and the rapid pace of expansion has made the area one of those with the highest proportion of children in northern Europe. The concentration of children in the same age group is very large and is rapidly becoming a sizable batch of teenagers. The youths are seeking more adult contacts. It appears that staff involved iii child care and youth activities know how the physical environment could be better designed. Their knowledge should be taken into account in the planning process.