Jasper Mbachu

This study is concerned with the forecast of the construction duration of Institutional building projects in Nigeria. Regression methods were used to develop an empirical mathematical model by regressing observed duration/floor area against planned duration/floor area for thirty-three completed institutional projects across Nigeria. Validity test on the efficacy of the model produced using Wilcoxon’s test for unpaired variables showed that there were no significant differences between the mean values of the observed and predicted duration of additional building projects used in the validity test. Some recommendations were made in order to minimize the prevailing wide discrepancies existing between proposed and actual duration figures, and also to minimize the resultant effects of the associated delays.

Subcontractors handle a major portion—about 85%—of all construction projects in the building industry. The ability of the main contractor and consultants to deliver the project within time, quality and cost targets depends largely on the performance of the subcontractors. Selection of subcontractors on the basis of overall ability to perform is therefore crucial to successful project delivery. The key criteria

ABSTRACT Little research is focused on payment risks which constitute the biggest obstacle to adequate cash flow and the contractor’s ability to successfully complete a project and maintain a viable business. To minimize risks and improve net cash flow in a project, the various ways in which the key stakeholders could contribute to the contractor’s payment risks and cash flow problems (the ‘problems’) were investigated along with the mitigation measures. Using a two-stage descriptive survey method, pilot interviews were conducted with contractors, subcontractors, project managers, designers and quantity surveyors (the ‘group’). A questionnaire was designed based on the constructs generated during unstructured pilot interviews and used to obtain feedback from 120 members of the ‘group’ through structured interviews. The feedback was analysed for risks using the multi-factor analytical technique. Results showed that employers were the most risky sources contributing 24% of the contractor’s ‘problems’ in a project. The contractors and subcontractors were evaluated as being ‘high’ risk sources contributing 19% and 17%, respectively. The consultants and suppliers were evaluated as ‘moderate’ and ‘very low’ risk sources, respectively, with overall 37% contribution. Ensuring valid payment and variation claims that are supported with well-documented evidence was a key mitigation measure suggested for addressing the critical risk factors attributed to the ‘group’. The findings could guide the project team’s risk management efforts, especially on how to efficiently allocate the available resources to address the risk factors with a view to achieving more satisfactory outcomes and profitability in a project.

Article This study is concerned with the analysis of the extent of contributions to delays and frequencies of occurrence of delay factors in building project. The data used in the study were gathered from records of twenty completed building projects randomly sampled from Lagos, Aba, Owerri, Abuja, Jos, Kaduna and Maiduguri. Statistical methods involving measures of central tendency and dispersion were used to compute the percentage contributions to delay and frequencies of occurrence of the delay factors identified from the data/information retrieved from the records. Result showed that the joint contribution to delays by these identified factors was 70.24% of the total project delays. 29.76% was the joint contribution to delays by other factors (intangible delay factors) which severity could not be quantified. These factors were experienced in all the projects analysed. The conclusion in this respect was that in every project, the extent of contribution to delay by certain delay f...

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