The theme for this thesisproject is environmental and ethical sustainability. This implies a project which deals with the technical approach related to low-tech sustainable architecture as well as the sensory qualities of designing architecture for children in developing countries. This report presents a sustainable center for children in Kampala, Uganda, where an integrated design process has been used to find the aesthetical, functional and technical solutions. The conclusion of this report will present how designing architecture for children can represent a sustainable solution in developing countries, seen from both an ethical and environmental point of view.