American Journal of Civil Engineering and Architecture
ISSN (Print): 2328-398X ISSN (Online): 2328-3998 Website: Editor-in-chief: Mohammad Arif Kamal
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American Journal of Civil Engineering and Architecture. 2018, 6(3), 123-128
DOI: 10.12691/ajcea-6-3-5
Open AccessArticle

Risk Factors in Cost Estimation: Building Contractors’ Experience

Harriet Eliufoo1,

1Ardhi University, School of Architecture, Construction Economics and Management, Building Economics Department, P. O. Box 35176, Dar es Salaam, Tanzania

Pub. Date: March 23, 2018

Cite this paper:
Harriet Eliufoo. Risk Factors in Cost Estimation: Building Contractors’ Experience. American Journal of Civil Engineering and Architecture. 2018; 6(3):123-128. doi: 10.12691/ajcea-6-3-5


The study has examined risk factors in cost estimation of building construction projects. An investigation was made of risk emanating from risk factors as perceived by building contractors. Data was collected by use of questionnaires were a total of 61 questionnaires were administered to building contractors. The analysis considered four categories of risk factors: construction, physical, financial and estimator’s risk factors. The results show estimator’s risk factors as perceived to have the highest risk on cost estimates. Overall respondents view indicate all four categories of risk factors have an influence to project performance at a range of moderate to high. The study has also established potential risks that originate from risk factors. Such risks are noted to work against the achievement of project goals and include amongst others, project delays, cost overrun and performance failures. It is hence recommended by the study for not only contractors to be vigilant in mitigation of risk factors, but clients as well should also take this initiative as they are bound to suffer when inaccurate cost estimates are committed to a project.

risks risk factors cost estimates building construction

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[1]  Flanagan, R. and Norman, G. (1993). Risk Management and Construction, Wiley- Blackwell.
[2]  Cullen, S. (2012). Risk Management, retrieved from http://www.wbdg. Org/ project/ riskmanage.php, accessed December 5, 2017.
[3]  Chileshe, N. and Kikwasi, G.J. (2013). “Perception of barriers to implementing risk assessment and management practices by construction professionals in Tanzania”, In: Smith, S.D and Ahiaga - Dagbui, D.D (Ed), Procs 29th. Annual ARCOM Conference, 2-. 4 September 2013, Reading, UK
[4]  Al-Bahar, J.F. and Crandall, K.C. (1990). “Systematic risk management approach for construction projects”, Journal of Construction Engineering and Management, 116(3), pp.533-546.
[5]  Wang, W.C., Wang, S.H., Tsui, Y.K. and Hsu, C.H. (2012). “A factor-based probabilistic cost model to support bid-price estimation”, Expert Systems with Applications, 39(5), pp.5358-5366.
[6]  Enshassi, A., Mohamed, S. and Madi, I. (2007). “Cost estimation practice in the Gaza Strip: A case study”. IUG Journal of Natural Studies, 15(2), pp. 153-176.
[7]  Akintoye, A. and Fitzgerald, E. (1999). “A survey of current cost estimating practices in the UK”, Construction Management & Economics, 18(2), pp.161-172.
[8]  Abdal-Hadi, M.A. (2010). Factors affecting accuracy of pre-tender cost estimate in Gaza Strip. Unpublished master thesis in construction management, The Islamic University of Gaza-Palestine.
[9]  ElSawy, I., Hosny, H. and Razek, M.A. (2011). “A neural network model for construction projects site overhead cost estimating”, Egypt, International Journal of Computer Science Issues (IJCSI), 8(1).
[10]  Marjuki, M. (2006). Computerized building cost estimating system, Master’s thesis, University Technology Malaysia, Faculty of Civil Engineering.
[11]  Jitendra, V. and Kuldeep, S. (2011). “Cost prediction using Neural Network Learning Techniques”, IJCSMS International Journal of Computer Science and Management Studies, Vo. 11(02). IJCSMS International Journal of Computer Science and Management Studies, Vol. 11(2), Aug 2011 ISSN (Online): 2231-5268 IJCSMS retrieved November 2017.
[12]  Chapman, R.J. (2001). “The controlling influences on effective risk identification and assessment for construction design management”, International Journal of Project Management, 19 (2001), pp.147-160.
[13]  Rezakhani, P. (2012). “Classifying key risk factors in construction projects” Bulletin of the Institute of Polytechnic Institute of Jassy, Construction Architecture section 58(2), p.27-38.
[14]  Jannadi, O.A. and Almishari, S. (2003). “Risk assessment in construction”, Journal of construction engineering and management, 129(5), pp.492-500.
[15]  Shash, A., and Abdul-Hadi, N.H. (1993), “The Effect of Contractor Size on Mark-up Size Decision in Saudi Arabia”, Construction Management and Economics, Vol. 11., PP421-429.
[16]  Ashworth A. (1994). Cost studies of Buildings, Addison Wesley Longman Ltd.
[17]  Shash A. and Nader Husni Abdul-Hadi (2006). “The effect of contractor size on mark-up size decision in Saudi Arabia”, Construction Management and Economics, 11:6, 421-429.
[18]  Rupen Sharma (2014). Tips for accurate cost estimates, retrieved from unknown-accurate-cost-estimates-tips. Accessed in November, 2017.
[19]  OBS, (2017). Oldcastle Building solutions, Tips for accurate construction project estimate, retrieved from , accessed June 8, 2017.
[20]  Holloway, S. (2013). Conceptual construction cost estimating, retrieved from The Holloway Consulting Group Website:, accessed March 17 2017.
[21]  Cheri, H and Daniel (2015). Seven ways contractors can manage cost escalation, Retrieved from http://www.XLGroup, accessed in June 13, 2017.
[22]  Laryea, S. and Hughes W. (2008). “How contractors price risk in bids: theory and practice”, Journal of Construction Management and Economics, 26, 911-924.
[23]  Abu Rizk, S, (2003). Risk and uncertainty in construction: an overview retrieved from & presentations.
[24]  Shash, A. A. (1993). “Factors considered in tendering decisions by top UK contractors”, Construction Management and Economics, 11(2): 111-18.
[25]  Kumar R. (2005), Research Methodology a step by step guide for beginners, Sage Publications.
[26]  Wong, J. T. Y. and Hui E. C. M. (2010). “Construction project risks: further considerations for constructors' pricing in Hong Kong”, Construction Management and Economics, 24:4, 425-438.
[27]  United Republic of Tanzania, The Public Procurement Regulation (2013). Government Printer, Dar es Salaam.