• Title/Summary/Keyword: cost estimating

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Empirical Analysis of Man-hour Data to Support a Cost-Plus Pricing Approach for Estimating BIM Service Costs

  • Koo, Bonsang;Lee, Ghang;Kim, Chung-woon;Shin, Byungjin
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.660-661
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    • 2015
  • Building Information Modeling (BIM) is a nascent technology in Korea, and currently lacks formal guidelines to assist Architectural and Engineering (AE) firms in estimating BIM service fees, while also allowing government agencies to allocate budgets for the rendered BIM services. This research provides a method to estimate costs for BIM services based on the cost-plus pricing framework. The approach requires a generalized estimate of the man hour per floor area data to calculate the direct labor costs. Man-hour data were collected from forty five projects that have implemented BIM. Interpolation of the man-hours was performed to develop a general reference table for 'Type 2' (i.e., public schools and office buildings, etc.) projects. By providing an objective approach for estimating the costs of BIM services, it allows clients and AE firms to agree upon a fair cost for BIM related services, and thus expedite its adoption in Korea.

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A Study on the Current Situations about the Use of Big Data for Cost Estimating Tasks in CM Companies (CM사 견적업무의 빅데이터 활용 현황에 관한 연구)

  • Kim, Hyeon Jin;Kim, Han Soo
    • Korean Journal of Construction Engineering and Management
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    • v.22 no.6
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    • pp.24-33
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    • 2021
  • Cost management is a major function of CM (construction management) companies for clients and cost estimating is a critical task in that it provides a baseline for cost management and a foundation for decision making in construction projects. For this purpose, CM companies need to obtain and use good quality data, which leads to more accurate and efficient cost estimating. As the use of big data becomes increasingly important in the construction industry, researches related to the theme have become the active areas of studies. However, literature review shows that the current situations in relation to the use of big for cost estimating of CM companies are under-researched. The objective of the study is to identify key characteristics and implications in the use of big data for cost estimating of CM companies, which can contribute to develop strategies for such purposes.

A study on application method of "Result unit cost" to Nuclear Power Plant (NPP) construction cost estimating (원전 건설공사 실적공사비 단가 제도 도입을 위한 연구)

  • Park, Weon-Seob;Jang, Kyoung-su
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.46-47
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    • 2014
  • Recently, BAI(Board of Audit and Inspection of Korea) has recommended that "Result unit cost" of Korean government apply to national power plant construction project when plant owner corporations estimate budget price for tender. but nuclear industry have difficulties with this suggestion. the purpose of this study is to review the "Result unit cost" and problem with application of NPP construction cost estimating. And proposed the direction of application of "Result unit cost" to NPP construction cost estimating.

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The Development of Probabilistic Time and Cost Data: Focus on field conditions and labor productivity

  • Hyun, Chang-Taek;Hong, Tae-Hoon;Ji, Soung-Min;Yu, Jun-Hyeok;An, Soo-Bae
    • Journal of Construction Engineering and Project Management
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    • v.1 no.1
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    • pp.37-43
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    • 2011
  • Labor productivity is a significant factor associated with controlling time, cost, and quality. Many researchers have developed models to define methods of measuring the relationship between productivity and various parameters such as the size of working area, maximum working hours, and the crew composition. Most of the previous research has focused on estimating productivity; however, this research concentrates on estimating labor productivity and developing time and cost data for repetitive concrete pouring activity. In Korea, "Standard Estimating" only entails the average productivity data of the construction industry, and it is difficult to predict the time and cost spent on any particular project. As a result, errors occur in estimating duration and cost for individual activities or projects. To address these issues, this research sought to collect data, measure productivity, and develop time and cost data using labor productivity based on field conditions from the collected data. A probabilistic approach is also proposed to develop data. A case study is performed to validate this process using actual data collected from construction sites. It is possible that the result will be used as the EVMS baseline of cost management and schedule management.

PROBABILISTIC MODEL-BASED APPROACH FOR TIME AND COST DATA : REGARDING FIELD CONDITIONS AND LABOR PRODUCTIVITY

  • ChangTaek Hyun;TaeHoon Hong;SoungMin Ji;JunHyeok Yu;SooBae An
    • International conference on construction engineering and project management
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    • 2011.02a
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    • pp.256-261
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    • 2011
  • Labor productivity is a significant factor related to control time, cost, and quality. Many researchers have developed models to define method of measuring the relationship between productivity and various constraints such as the size of working area, maximum working hours, and the crew composition. Most of the previous research has focused on estimating productivity; however, this research concentrates on estimating labor productivity and developing time and cost data for repetitive concrete pouring activity. In Korea, "Standard Estimating" only contains the average productivity data of the construction industry, and it is difficult to predict the time and cost of any particular project; hence, there are some errors in estimating duration and cost for individual activity and project. To address these issues, this research collects data, measures productivity, and develops time and cost data using labor productivity based on field conditions from the collected data. A probabilistic approach is also proposed to develop data. A case study is performed to validate this process using actual data collected from construction sites and it is possible that the result will be used as the EVMS baseline of cost management and schedule management.

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A Study on the Perceptions and Current Practices in Estimating Risk Cost of Contractor's Construction Budget - Focused on Building Projects - (종합건설사 실행예산 편성 시 리스크 비용 산정에 관한 인식 및 실태에 관한 연구 - 건축공사를 중심으로 -)

  • Choi, Jeong Won;Kim, Han Soo
    • Korean Journal of Construction Engineering and Management
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    • v.23 no.3
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    • pp.13-24
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    • 2022
  • Construction projects are exposed to various types of risks, which tend to increase. The increasing risks call for contractors' more attentions to forecasting and dealing with these risks. One of the measures to deal with contractors' risks is to forecast or estimate risk cost and include it in the construction budget. Although various researches in relation to risk cost have been observed, little attention has been paid to general contractors' perceptions and current practices in estimating risk cost of construction budget. The objective of the study is to identify and discuss key characteristics and implications based on the survey and analysis of general contractors' perceptions and current practices in estimating risk cost of construction budget. The study shows that there is a gap between the perception and the practice of estimating risk cost, that is, high perception of the importance of risk cost and a relatively low level of practice. It suggests that historical cost data, guidelines and corporate-level standard procedures are required to improve the current practice in addition to sufficient time allocations for risk cost estimating. It discusses that there is a need for using sophisticated estimating techniques including bid data analytics despite a low level of the current adoption, and also proposes that research and development in the field of the sophisticated estimating techniques should be further implemented in order to increase their practicality.

Analysis of Excavation Speed and Direct Construction Cost Based on the Operating Productivities of TBM Method Site - Diameter 5.0m Target (수로터널공사의 효율성 분석을 통한 굴진속도 및 직접공사비 분석 - 구경 5.0m 중심으로)

  • Park, Hong Tae;Lee, Yang Kyu
    • Journal of the Society of Disaster Information
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    • v.8 no.4
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    • pp.328-335
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    • 2012
  • The resource-based estimating based on standard unit price of construction work was estimated by multiplying the price per standard unit of work on the amount of labor, material, equipment use time. However, limitation of the resource-based estimating way does not adequately reflect the actual transactions prices. On the subject of water tunnel excavation as a new attempt to overcome these limitations, this study analyzed productivity by work type into cutter inspection/ exchange, TBM maintenance, TBM inspection/refueling, subsequent installations, tramcar, operating change, a cave-underground reinforcement / rock reinforcement, safety / meetings and analyzed actual cost estimating and the net advance rate based on this analysis result. Actual cost estimating calculation approach presented in this study can be utilized as a useful tool to predict the actual cost estimating in the TBM water tunnels field.

Cost Estimating Method of Public Building Construction through Construction Scale (공사규모에 따른 공공건축물 공사비의 산정방법)

  • Yim, Jin-Ho;Park, Jun-Mo;Kim, Ok-Kyue
    • Journal of the Korea Institute of Building Construction
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    • v.15 no.3
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    • pp.307-316
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    • 2015
  • As there are a lot of differences in the public building construction cost depending on the construction scale of actual construction cost system, a lot of problems occur in the estimation of the cost. So, the development of a predictive model depending on the construction scale shall be used in a way that it is applied to the case selectively and differently. This study drew a cost estimating model through a regression analysis. For this, 42 construction sites which were ordered during 2011 to 2012 by Public Procurement Service data were selected as a historical data. Based on the application of the model to new construction and the verification of its effect, the reasonable model for estimating the construction cost has been suggested.

A study on Cost~Estimating System based on Object- oriented Cad System (객체지향 캐드시스템을 활용한 견적관리 시스템 연구)

  • Song, Choon-Dong
    • Journal of The Korean Digital Architecture Interior Association
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    • v.1 no.1
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    • pp.46-50
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    • 2001
  • It is known that to automate the quantity take-off process enables you to increase the productivity best among the construction business field. However, the limitation of 2D(Two-dimension) CAD System prevented a cost-estimating system which makes the great effects on the quantity take-off process from being developed. This study aims that you can automate both the itemized statements and the quantity take-off process by using commercially available object-oriented CAD system. The commercially available CAD system today does not give us entire satisfaction. This study shows the deduction of the old boundaries of the object-oriented CAD system and the solution of those problems. And it also studied about the quantity take-off process and the automated cost-estimating system that can be used in the simple and plain repair-maintenance work such as the execution drawing which doesn't need the complicated drawings.

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Interior Cost Estimating as a Design Marketing Tool - for Executive Office Interior (디자인 마케팅을 위한 인테리어 공사비 초기 예측기법- 일원공간의 인테리어 프로젝트를 중심으로 -)

  • 이혜연
    • Korean Institute of Interior Design Journal
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    • no.23
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    • pp.68-73
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    • 2000
  • The purpose of this research is to develop interior construction cost-estimating system at the early stage of the project. Though general construction estimates are typically in quantitative, interior construction should be in rather qualitative. Therefore, design-concerned cost-estimating methods should be developed to manage interior projects from the early statge. 30 estimates of VIP-Zone interior projects, were examined to develop the general type of composition and material classification. The cost has been classified by construction parts such as wall, ceiling, floor, and doors & windows and their treatments. The composition and material related estimating system (CMRES) was consisted of the unit average costs of classification and the variation coefficients. The CMRESS was verified by the case study, and the results sowed that the difference between the actual estimate and the CMRES was competitively confident.

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