State-of-the-art building automation systems are energy-efficient and sustainable. Recently eu.bac [2] has revealed the potential for increasing energy efficiency in buildings with a system certification independent of the manufacturer. The Energy Performance of Buildings Directive (EPBD), which was adopted by the EU in 2002 and revised in 2010, is an important step towards the improvement of the energy efficiency of the large stock of existing buildings in Europe. As a result, more than forty EN standards have been developed with the aim of harmonizing the methods of calculating the energy consumption of buildings in Europe. EN 15232 [1] shows how building automation can be used to minimise energy consumption. The new 'eu.bac System' [3] methodology assesses building automation based on EN 15232 [1]. The auditing of a building automation system represents an ideal basis for optimising the installation - so-called 'continuous commissioning'-and supports building automation manufactures services with recognised standards. This leads to sustainable operation and maintenance of building value through life time. The European Building Automation and Controls Association (eu.bac) [2] was founded in 2003. It comprises both manufacturers and providers. Its objectives are to promote building automation, ensure product quality and to actively support CEN/ISO standardisation and European directives. (C) 2014 Elsevier B.V. All rights reserved.