아파트 분양원가의 검증가능성 제고방안

Abstract

Recently there exists a controversial issue of whether apartment pre-sale price should be open to the public or not. People who insists opening of cost may assume that levels of pre-sale price are overly exaggerated. In fact, it is extremely difficult to reach a social consensus of what level is reasonable for the pre-sale price of apartment. This study is aimed to introduce an objective verification method for determining pre-sale price. The method implies that the pre-sale price should be decided on the basis of construction cost rather than market price. Furthermore, the pre-sale price should be verified through a few steps as follows : (a) to segment the construction cost into a set of components according to stages of housing construction process, (b) to create a segmentation model of cost components to examine the price level, and (c) to evaluate the validity of the model with data sets such as real data employed for previous studies, open data of public announcement for recruiting construction supervisor, and data in real cases of public announcement for recruiting tenants. As a result of this study, the construction cost can be exactly estimated using the segmentation method of cost components than the existing pre-sale cost method which is consisted of 7 components. This study suggests that open data used in the process of housing construction should be reliable and valid for estimating the reasonable level of construction cost.