As part of the ALTENER programme promoting renewable energy sources in the Community, a practical manual on "Green design: Sustainable building for Ireland" has been prepared with support from DG XVII of the European Commission. The manual is based on an ALTENER project entitled "Training and information for architects in passive solar and bioclimatic design", a joint undertaking of the Energy Research Group at University College Dublin, the Office of Public Works and the Royal Institute of the Architects of Ireland. The manual sets out the principles of sustainable design, combined with technical material and design guidance specific to Ireland's climate and construction practices. It concentrates primarily on passive solar heating, natural cooling and day-lighting, as well as the potential of other forms of renewable energy. Guidance is also included on the energy and pollution implications of building materials, on the protection of water resources and on the reduction of waste.