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The stock of buildings in Europe is relatively old, with more than 40 % of it built before 1960 and 90 % before 1990. About 75 % of buildings are energy inefficient and, depending on the individual Member State, 0.4 % to 1.2 % of the stock is renovated each year [1]. From January, 1st 2014, 3 % of the total floor area of buildings owned by central government must be renovated each year [2]. According to Energy act in the Republic of Slovenia [3], the European requirement is applied also to educational institutions owned by self-governing local communities and public sector. The present day extensive renovations are going in wrong direction: towards narrow-minded measures with air tightened building, thermally well-insulated envelope, and highly energy efficient mechanical systems. Such non-holistic approach is in fact stimulated by implemented legal requirements on energy efficiency that allow the use of minimal permissible values for ventilation, while other defined requirements and recommendations are as a rule not taken into the consideration. For example, the minimal value of volume air changes per hour (ACH) for working and living spaces at the time when occupants are present is 0.5 1/h (Article 8) [4]. Such low ventilation rates have been associated with statistically significant worsening of occupants` health outcomes [5]. Optimal indoor environmental quality (IEQ) is especially important in every living and working environment with vulnerable population groups. Especially problematic are educational institutions, Deteriorated Indoor Environmental Quality as a Collateral Damage of Present Day Extensive Renovations Dovjak, M. – Slobodnik, J. – Krainer, A. Mateja Dovjak1,* – Jan Slobodnik1 – Aleš Krainer2 1University of Ljubljana, Faculty of Civil and Geodetic Engineering, Slovenia 2Institute of Public and Environmental Health, Slovenia