With the aim of quality assurance of energy certificates by means of random checks, the member states were obliged to set up an independent control system in accordance with Art. 18 EU Building Directive 2010. As this requirement, from the point of view of the European Commission, has not been met in due time by all provinces of Austria, an infringement procedure against the nation followed. In order to avoid penalties in the event of a conviction, this obligation was introduced in accordance with Art. 18 EU Building Directive with the insertion of § 36a Oö. Bautechnikgesetz in the course of the Oö. Bautechnikgesetz amendment 2016. The department Environmental Protection, group Building Physics of the Upper Austria governments office, on behalf of the Upper Austrian government, is entrusted with the operational implementation of these legal provisions, which it has implemented since May 2017. At the beginning of this master thesis, the legal background to the emergence of the independent control system in Upper Austria and all relevant legal bases for its practical implementation are illustrated. Consequently, the correct interpretation of the substantive obligation under EU law, its concrete legal and practical implementation in Upper Austria as well as administrative control related to the sampling control are explained. Finally, the in Upper Austria established independent control system is compared with the methodology of other federal states. It turns out that Upper Austrias legislators, with their commitment to option 1a of the annex II to the EU Buildings Directive, have gone for an efficient implementation of the EU legislation. The practical implementation of random sampling without a compulsory online database and around 400 energy certificates per year represents the most economic execution, from the point of view of administration als well as exhibitor expense, and also allows statistically correct fulfillment of the specifications according to Art. 18 EU Buildings Directive.