Nowadays, the term sustainability is often used in various fields, including construction. Sustainable building construction incorporates design, construction and maintenance throughout the life cycle, where all four aspects are balanced: health, social, environmental and economic. Sustainability alone can also be evaluated using methods such as BREEAM, LEED, DGNB and LEVELS, developed abroad and adapted to countries national requirements. In Slovenia, we do not have a developed national method for assessing sustainability, so the Active House scheme is presented as a potentially suitable method, for analysing sustainable construction in the case of a single-family house. The method includes various indicators of sustainable construction, covering three main areas: user comfort, energy use and environmental protection. The final work focuses on determining the appropriate quality of selected indicators in the indoor environment, which relates to the daylight, thermal environment, indoor air quality and acoustic comfort. As found in the analysis of daylight, which was performed using measurements and simulation with VELUX Daylight Visualizer, the rooms in selected buildings are not adequately lit (simulated values: from 64.5 lx to 1260,9 lx, average value 233,7 lx, measured values: from 74.9 to 445.4 lx, average value 245.6 lx). We also used field measurements to analyse thermal comfort and indoor air quality and compare it with Active House criteria. The indoor air quality was not adequate (measured CO2 values: from 410 ppm to 2539 ppm, average 1077 ppm), which can be attributed to the inappropriately adjusted level of ventilation and filters that need cleaning or replacement. The parameters of acoustic comfort were measured and meet the criteria (the measured noise level was 33.4 dB). Based on the results, we also identified a set of improvements that would help improve the sustainability of construction. These are mainly regular replacement of filters by the listed manufacturers and an increase in the amount of fresh air for ventilation. The presented approach is an example for assessing other criteria of the Active House scheme, which refer to energy use and environmental protection. All the proposed improvements are also helpful for building users.
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