HESMOS will achieve an industry-driven holistic approach for sustainable optimisation of energy performance and emissions (CO2) reduction through integrated design and simulation, while balancing investment, maintenance and reinvestment costs. The objective is to close the gaps between existing intelligent building/facilities data so that complex lifecycle simulation can easily be done in all design, refurbishment and retrofitting phases where the largest energy saving potentials exist. This will be achieved by (1) extending existing BIM, energy simulation and cost calculation tools, so that they can seamlessly exchange the required data, (2) integrating advanced energy simulation tools into the design and FM process, so that BIM-CAD and FM tools can be used as building energy simulator and gap identifier, (3) developing new applications that can visualize building performance in easy to understand way and can quickly display impacts of changed building/space parameters, (4) developing new "Cockpit functionality" in BIM-CAD on EPBD basis to provide fast feedback of the impact of design parameters on lifecycle energy performance, (5) extending BIM-CAD to model and manage buildings and surrounding areas, and (6) ex¬tending BIM-CAD by web services to act as Integrated Virtual Energy Laboratory (IVEL) enabling the study of design and retrofitting alternatives concerning energy performance and total costs. An innovative SOA around the kernel functionality of BIM-based CAD/FM will be applied. Information interoperability will be achieved by enhancing BIM with energy and emissions features to a new sharable eeBIM. Intelligent access methods and a specialised ontology will be developed to enable multi-system integration and management of material, climate and product databases and data from sensor networks and other ICT sub-systems into CAD/FM. An extensive 30-month validation program at 2 PPP projects will be carried out during the project.