Welcome to the proceedings of the Third International Conference on Sustainability in Energy and Buildings, SEB’11, held in Marseilles in France, organised by the Laboratoire des Sciences del'Information et des Systèmes (LSIS) in Marseille, France in partnership with KES International.   SEB'11 formed a welcome opportunity for researchers in subjects related to sustainability, renewable energy technology, and applications in the built environment to mix with other scientists, industrialists and stakeholders in the field.   The conference featured presentations on a range of renewable energy and sustainability related topics. In addition the conference explored two innovative themes:  the application of intelligent sensing, control, optimisation and modelling techniques to sustainability and  the technology of sustainable buildings.  These two themes combine synergetically to address issues relating to The Intelligent Building.   SEB’11 attracted a significant number of submissions from around the world.  These were subjected to a two-stage blind peer-review process.  With the objective of producing a high-quality conference, only the best 50 or so of these were selected for presentation at the conference and publication in the proceedings.    It is hoped that you will find this volume an interesting, informative and useful resource for your research.