Department of Quantity Surveying

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Browsing Department of Quantity Surveying by Author "Babatunde, S.O."

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  • Item
    Open Access
    Comparative accuracy of floor area, storey enclosure and cubic methods in preparing preliminary estimate in Nigeria
    (Macmillan Publishers Ltd., 2011) Akinsiku, O. E.; Babatunde, S.O.; Opawole, A.
    The aim of construction cost forecasting is to provide an estimate of a construction contract. Construction clients are interested in knowing their financial commitment before the completion of a detailed design. There are various methods used by estimators to forecast the construction cost of building and civil engineering projects. The accuracy of these techniques is, however, impeded by some external factors that need to be overcome or are provided for in order to get a realistic estimated value. This study examined the three most common techniques used in preparing preliminary estimates in Nigeria, namely, the floor area or superficial method, the cubic method and the storey enclosure method. Total construction costs were extracted from the final accounts of 10 bank projects executed within the last 15 months in Lagos metropolis, Nigeria. From the extracted costs, using a random selection, a project was used as the base on which other techniques were used. The data were analysed using their respective deviation from the final cost and the Pearson correlation coefficient was used to test their degree of relationship with the final cost. The study revealed the cubic method of calculating preliminary estimates as having the highest frequency of accuracy closest to the obtained construction value with respect to the 10 projects sampled, whereas the floor area and storey enclosure methods followed behind. However, using the Pearson product moment correlation coefficient, the floor area or superficial method has the greatest relationship to the construction cost; the cubic method came second, whereas the storey enclosure method has the least relationship with the construction cost.
  • Item
    Open Access
    Critical success factors in public-private partnership (PPP) on infrastructure delivery in Nigeria
    (Emerald Group Publishing Limited, 2012) Babatunde, S.O.; Opawole, A.; Akinsiku, O. E.
    Purpose – Federal and State Governments began to explore more subtle alternatives for accessing private sector resources in the delivery and operation of public facilities. The purpose of this paper is to examine the types of infrastructural projects most suitable using public-private partnership (PPP) for executions and identify the critical success factors in PPP on infrastructural projects with a view to strengthening the partnership between the public (government) and private sector. The overall goal is to enhance infrastructural projects delivery in Nigeria. Design/methodology/approach – The primary data consists of survey questionnaires, drawn based on the identified factors on existing literature on critical success factors (CSFs). The structured questionnaires were administered on participants that were involved in the execution of PPP projects, either during the initial stage, construction stage or maintenance and operating stages in Lagos State. Findings – The results of the mean score ranking indicate that transportation, which include roads, rails and airports construction ranked highest followed by provision of electricity and water. Real estate and educational construction projects ranked lowest in terms of suitability of execution using PPPs. However, the result of the one-way analysis of variance (ANOVA) indicates that, there was no significant difference in the suitability of PPP for execution of the types of infrastructural projects delivery. The paper further identified nine CSFs in public-private partnerships as follows: competitive procurement process, thorough and realistic assessment of the cost and benefits, favorable framework, appropriate risk allocation and risk sharing, government involvement by providing a guarantee, political support, stable macroeconomic condition, sound economic policy and availability of suitable financial market. The study, however, showed that well organized and committed public agency; social support; project technical feasibility and multi-benefits objectives are the CFSs that are most important to the private investors. On the other hand, factors such as transparency in the procurement process; shared authority between public and private sector; thorough and realistic assessment of the cost and benefits; commitment and responsibility of public and private sector and strong and good private consortium are the CSFs that are most important to the public clients. Originality/value – The results indicated that there was no significant difference in the suitability of PPP for execution of infrastructural projects delivery. This shows that PPP is suitable for all types of infrastructural projects. What needs to be done is to ensure that all the success factors responsible for successful implementations of PPPs are well structured in a way that its optimum performance can be guaranteed. Also, in identification of the critical factors in PPP it would help to develop a body of PPP knowledge. This knowledge would help in the establishment of relevant laws, regulations and guidelines and in the development of efficient frameworks for best PPP practices.