The concept of an intelligent building has existed for over 30 years and is seen as a solution to a number of economic and environmental problems. Intelligent buildings are often seen as a means of improving the energy efficiency of the built environment. However they are increasingly being promoted as a means of improving the operational efficiency of buildings, providing enhanced building and personal security, and improving the availability of management information to support better and quicker decision making. The potential cyber security risks inherent in the adoption of intelligent buildings are rarely discussed.