The number of children enrolled in the pre-school education system is growing every year. In order to protect children as vulnerable groups, it is necessary that the environment in educational institutions is healthy, comfortable, and the health risk factors are fully prevented. Such an environment is stimulating for both children and employees. When designing energy efficient facilities, it is often forgotten about users and the quality of the internal environment. The purpose of the thesis will be to prepare a proposal for the renovation of the selected facility for the needs of the educational institution in terms of the indoor environmental quality and energy use. The methodology will include a baseline analysis with measurements of selected parameters of the indoor environment quality and survey of users of the facility. In the field of energy use and building physics we will perform calculations with the URSA and U-wert software. The measured values will be compared with the calculated and statutory ones. We will link the results of the measurements, calculations and user reviews. Based on the conclusions, we will prepare proposals for measures. The results of measurements, surveys and calculations have shown that the building needs to be completely renovated. Measurements showed that the surface temperature on the inner side of the constructional complexes often deviated from the legal requirements and / or recommendations, which affected the operative temperatures; poor air quality and insufficient level of illumination. Similar results were obtained with the results of the surveys. Users warned us about poorer indoor air quality, drafts, and an inadequate thermal environment in playrooms. Surveys showed that users did not detect inappropriate levels of illumination (despite the insufficient measured levels of illumination), but they often used an artificial lighting. The results of the calculations are comparable with the findings of measurements and surveys and indicate a high U-factor, a phenomenon of condensation and a low surface temperature, and excessive energy use. For the selected building, comprehensive measures are proposed to achieve a quality of internal environment with the minimum possible use of energy, which should be carried out with the cooperation of the professions, supported by the opinions of the users of the facility.