Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

A new building with total floor area of 3,000m² or above, which public agency currently constructs, is required to obtain a building energy efficiency rating level 1 or better. Although construction cost is caused to increase as building energy efficiency increases, precise standards for construction cost according to each rating level are not established. Some studies presented a difference in construction cost according to rating, based on the estimated construction cost of single building. However, analysis of construction cost based on actual construction cost according to each rating level is still insufficient. Therefore, this study presents a difference in actual construction cost according to building energy efficiency rating for non-residential building. To this end, first, data on the actual construction cost of non-residential building obtaining level 1+, 1++ in main certification were collected through survey. Second, outliers were removed by Interquartile Ranges. Third, total construction costs according to building energy efficiency rating were comparatively analyzed. As a result, the analysis showed that level 1++ additionally needed approximately 37% of construction cost of office building, compared with level 1+, and the difference was statistically significant.