Recent projects for transferring Public Office buildings and estimation of appropriate construction expense are highly important for both government and construction firms. Moreover, estimation and management of construction expense can be regarded as extremely important duties for effective execution of a national budget as nation’s finance is invested in the Public office building projects progressed by the government. To progress one project for Public office building, not only the organization demanding the project but also an investment screening organization, a budget-managing organization, a feasibility assessment institution and many other related organizations participate in the project and a lot of decisions arisen from the project operation are made on the basis of construction expenses calculated for relevant stages. And estimation of rational construction expense is also critical for designers in order to create design within the fixed budget simultaneously with securing the quality and efficiency of structures to the maximum. Therefore this research suggested an improvement process to analyze problems in current construction expense management process and to administer the construction expenses effectively.

A prediction of construction cost in preparation for construction document is calculated in compliance with the unit cost in Public construction of korea. This eventually means that the reasonable construction cost of a building can't be determined before construction document phase cost of construction is settled and that the cost of construction is calculated inefficiently because of connection failing between cost management of detailed estimation and information. To improve those problems, therefore, Cost estimating model of structural building elements with approximate quantity survey method is suggested in this research. The model predict the amount of materials and the cost of construction on the basis of historical similar cases. In the direction of data analysis of this research, ratio statistics value is put to practical use to fit into the peculiarities of approximate estimate of each work trade on the basis of actual data amount of materials of historical cases. In addition, the construction phase is connected through the result of a approximate estimate sorted by elements, details work trade.

When managers predict exact construction cost at early stage and design phase, they can reduce construction cost in a more efficient way than to predict at construction stage. But present of public construction cost estimation and management almost after the construction documents design phase. Therefore, construction cost management in the early stage and schematic design phase to generally use approximate estimating is not correct. Accordingly, this study analyze problem of current cost estimating method and a concrete cost plans make using case information of actual cost to analyze in schematic design phase. Possible to check going on the suitable design, this study conducts the preliminary research for the development of cost estimating model.

현대 건축은 복잡하고 이질적인 경향들과 요소들의 공존 안에서 발전해 오고 있는데, 비 물질화와 디지털 미디어 기술의 만남으로 인해 현대 건축에서는 피막으로서 표피에 관심이 더욱 집중되고 있고, 표피디자인에 관한 다양한 시도들이 진행되면서 건축표피 디자인에 관한 관심이 높아지고 있다. 최근 각 지방자치단체들은 공공건축 디자인이 도시 이미지나 생활공간의 질, 나아가 도시 경쟁력을 높이기 위한 중요한 요소라는 점을 인식해 관련법을 정비하고 새롭게 만드는데 많은 관심과 노력을 기울이고 있으며, 그 범주 안에 공공청사의 표피디자인도 포함된다고 할 수 있다. 따라서 본 연구에서는 도시 이미지 향상에 중요한 요소로 평가되고 있는 공공청사의 표피디자인에 관해 연구를 진행하였다. 연구의 방법으로는 문헌조사와 사례조사로 이루어지며, 특히 사례조사에서 분석방법을 건축 표피디자인의 구성요소인 형태, 장식, 재료, 패턴, 색채 5가지로 나누어 특성을 분석하고 경향별로 세분화 하여 표피디자인 구성요소를 분석 하였다. 공공청사 사례분석 결과 표피디자인은 도시와 건축, 도시민과 소통의 매개체로서 도시의 이미지와 브랜드를 형성하고, 향상시키는데 중요한 역할을 한다고 할 수 있다.