Vol 6 Issue 1
Anthony O. Ujene and Akaninyene A.Umoh
The high and uncertain cost of building development has been partly traced to varying characteristics of the sites. This study evaluated the nature and influence of site characteristics on the cost and time performance of building projects in Nigeria. The objectives are to evaluate the; site characteristics influencing project performance, cost and time performance and the relationship between the site characteristics and the cost-time performance of building projects. The study evaluated eleven site characteristics and two performance indicators obtained from records of construction costs, contract documents, and valuation reports of 56 purposively sampled building project spread across several cities. Analyses were with descriptive, T-test and Pearson correlation. In conclusion the site characteristics have varying influences and magnitude, with costs of land having the largest variation. All the projects investigated had cost overrun range that calls for concern, with half of the projects investigated having 40% overrun and above, while one-quarter of the projects had time overrun not less than 40% of initial duration. It was also concluded that cost overrun rate is significantly different from that of time. The study also concluded that five site characteristics; soil strength, site topography, labour availability, ratio of plot undeveloped and ground water correlated significantly with the rate of cost and time overrun. The study recommends that stakeholders should be vary of the significant difference between cost and time overrun and give priority attention to the five significant site characteristics during project planning and execution.
LE Thi Hoai An
Applying information technologies into construction industry is an essential brand for now and in the future. Recent studies in utilizing Building Information Modeling (BIM) to transfer multi-dimensional information in construction industry in several countries in the world show that BIM is vital for construction industry development. The effective advances of BIM help all project stakeholders communicate smoothly and save time and resources in exchanging information. However, besides the benefits that the application of BIM may bring to the projects, there exists risks and challenges that need to be considered carefully. A questionnaire developed based on lessons and experiences obtained from literature on the use of BIM in selected countries was used in a survey with participants from the construction industry in Vietnam in order to find out the potential benefits, risks and challenges in the application of BIM in the industry. The results have also been analyzed by statistical mean testing to determine the participants’ expectations in using BIM in their projects. The findings of the paper would hopefully spread BIM concepts more widely to Vietnamese construction professionals as well as address the outweigh between advantages and disadvantages of BIM implementation in Vietnamese construction context. It also points out that improving infrastructure, completing legal framework and training human resource in terms of technical and management are needed for using BIM in Vietnam.
Osazuwa Mark Edosa and Adebiyi John Oladotun
The quantity surveyors, in the present day construction industry, through skills and ability, analyzes cost components of a construction project in a scientific way and applies the result of the analysis to a variety of financial and economic problems confronting the developer and the designer. The wide array of quantity surveyors responsibilities means that they have to be educated, trained, and highly skilled in diverse subjects. However, competence, in any sphere of work, can be a difficult concept to pin down, especially, when it relates to professional occupations where such roles are complex and involved diverse professionals in the built environment sector. This paper aims to investigate the competencies of quantity surveyors in the discharge of its professional duties by evaluating the effects of professional competency on quantity surveying practices in Nigeria. The study population comprised professional quantity surveyors who are in the private construction/consulting firms in Lagos State, Nigeria. Data were obtained to investigate the professional views on the quantity surveying profession, the roles of quantity surveyors in the construction industry and the need for professionalism and competencies in the surveying industry. Questionnaires were administered to randomly select 200 practicing quantity surveyors in Lagos state. Findings revealed that the major role of quantity surveyors in the construction industry is the preparation of the bill of quantity as it ranked 1st with RII value of 1.00; it was also discovered that quantity surveyors were in agreement with client service delivery as the first ethical standard that construction professionals should consider when performing their professional obligations in order to avoid project failure and over-cost. It is therefore recommended that the professional bodies and the academia should organize proper and adequate service training, workshops and seminars which will enhance the possibility of acquiring more skills and experience so as to improve competence in the discharge of quantity surveyors professional duties.
Francis P. UDOUDOH and Anthony O. UJENE
This paper assessed the state of maintenance of public infrastructure provided in corporate housing estates to enhance sustainable estate development. The objectives included evaluating the existing state of urban infrastructure maintenance in public housing estates, the nature as well as influence of strategies adopted in their maintenance. A stratified purposive survey of 120 inhabitants of two major public estates in Uyo, Nigeria with structured questionnaire resulted in 102 valid responses. This consists of Ewet housing (62) and Shelter Afrique (40). Data were analysed using descriptive, Quality index, Mann-Whitney and Spearman correlation tests. The results indicated that the state on infrastructure as well as the strategies used in their maintenance does not differ significantly between the estates. The research also revealed that 50% of the available infrastructure were maintained marginally, using about 44.4% of expected maintenance strategies. Security, electricity and water were regularly maintained, while the most used strategies were financial management strategy, technical strategy and procurement strategy which had no significant influence on the state of the infrastructure. It is therefore recommended that strategic maintenance of estate infrastructure should be incorporated into the overall estate management policy, while a separate maintenance unit should be established to handle the maintenance of decaying estate infrastructure on a regular basis for sustainable public housing estate development.