The building sector constitutes approximately the 40% of the total energy consumption in EU. TheDirective 2002/91/EC provides a precise legislative framework for improving the energy performanceof the built environment. [1]It was adopted on December 2002 and entered into force in January 2003. According to the article 15of this Directive all member states have a time period of three years (till January 2006) to implementthe Directive in their own countries.
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