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An evaluation of the budgetary reliability of bills of quantities in building procurement

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Odeyinka, Henry and Perera, Srinath (2009) An evaluation of the budgetary reliability of bills of quantities in building procurement. In: COBRA 2009. Royal Institution of Chartered Surveyors (RICS), London, United Kingdom, pp. 435-446. ISBN 978-1-84219-519-2 [Book section]

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Abstract

Bills of quantities have been documented to exist in some form or another as far back aswhen the Egyptian pyramids were being constructed. In spite of that age long history, thebills of quantities (BOQ) seems to be the most misinterpreted aspects of buildingdocumentation today. The pros and cons of the bills of quantities have been deliberatedon for many years and have generated strongly held and differing views. Whilst this isrecognised, the essence of this study is to evaluate the reliability of bills of quantities inbuilding project procurement. The study was carried out using secondary data from somerecently completed building projects within the Northern Ireland construction industry.Using secondary data from completed projects, the budgetary reliability of the bills ofquantities in building project procurement was investigated. Data analysis was carried outusing percentage deviation of final account figures from the bills of quantities. Furtheranalyses were carried out using root mean square deviation and relative mean absolutedeviation methods of analyses. Results showed that the budgetary reliability of the billsof quantities seems to vary depending on project types. Whilst a deviation of -3 to 4%was obtained on housing projects analysed, the deviation on educational projects wasbetween -4 and 17% whist on commercial project, it came out to be between -20 and 20%and in the case of refurbishment projects, a deviation of between -11 and 37% wasobtained. This seems to suggest that the more complex a project is, the less reliable it is touse the BOQ to guarantee cost certainty.

Item Type:Book section
Keywords:Bills of quantities, budget, building projects, reliability, traditional procurement
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Centre for Sustainable Technologies (CST)
ID Code:13809
Deposited By:Dr Henry Odeyinka
Deposited On:20 May 2010 12:39
Last Modified:20 May 2010 12:39

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