Buildings account for almost 40% of the total energy use in Europe. Environmental, legislative and economical drivers require more efficient and accurate energy management of buildings. Current building management systems do not have the capabilities of energy specific monitoring and management. To address these issues, the Holistic Multi-Dimensional Information Management System will be described with its components: Data Warehouse core, Extraction, Transformation and Loading (ETL) tool and Information Representation tools. The purpose of the developed system is to store, integrate, analyse complex data sets from multiple data and information sources such as wired/wireless sensing devices (sensors and meters) and BIM tools. Data collected from the sensing devices is classified and categorised by the information extracted from the BIM tools and aggregated for performing multi-dimensional analysis of building performance data to support decision making processes of the different stakeholders through specifically developed GUIs.