In Europe, the Energy Performance of Buildings Directive is a driving force for member states to develop and strengthen energy performance regulations for new and existing buildings. In the Netherlands, 33% of dwellings (2.4 million) are owned by social housing associations (Aedes, 2013), and 86% (CBS.nl, 2012) of them do not yet conform to the European 2009/28/EC which states that all the existing houses have to reach at least energy label B in 2020 (Aedes, 2014). In the last years, the renovation rate for these dwellings is rising at a very low speed, and if this trend will not significantly increase, the Dutch social housing corporations will not comply with the European Commission requirements. The increasing developments in energy conservation measures and building-integrated renewable energy technologies have the potential to accelerate the sustainable renovation process. However, due to a lack of information and ambiguity about the performance of such systems, the decision-makers in companies whose core competence is not strictly energy efficiency related, face challenges in selecting the most appropriate sets of measures for their projects. Hence, there is a need for a tool to assist well-informed decision-making for renovation measures in the Dutch social housing stock. Such a tool should be fast and easy-to-use, yet cover a wide range of technologies, be robust, and lead to reliable and accurate predictions. This report describes the challenges and solutions in the development of a decision support tool that calculates the possible combinations of thermal insulation and a selection of relevant renewable energy technologies at house level. Through this system, the combined energy savings, environmental impact and financial feasibility for a given house archetype can easily be calculated by a non-specialist user and the applied to large projects within the social housing corporation. The functional needs and requirements of the decision support tool were identified through a series of interviews with ...