The Causes And Effects Of Variations On Infrastructure Projects Delivery In Abuja. Nigeria

Abstract

Nigeria infrastructure projects delivery have been faced with challenges of the variation orders during the course of construction projects especially road, bridges, railways, high rise building, flyovers, and airport construction. The paper aimed at establishing the causes and effects of variations on infrastructure projects delivery. A total of 100 numbers of questionnaires were distributed to Engineers, Quantity surveyors, Project Managers, Construction Managers, Contractors, Consultant and Clients in the construction industry in Abuja. Only 82% of the questionnaire distributed were filled correctly and returned which was used for the analysis. The descriptive analysis was used to analyzed the data obtained from the survey. The result obtained from the analysis show that the design related factors, client related factors and consultant related factors are the majors causes of the variations on infrastructure projects delivery. The design related factors was further evaluated and the result ranked discrepancies, inadequate working drawing, error and omission in design very high as factors that causes the variation on infrastructure project delivery. Furthermore, the followings delays in construction, increase in projects cost, slow project progress and construction rework were ranked high as effects of variations on infrastructure projects delivery. Therefore, the paper recommended that adequate site feasibility study should be conducted before the brief stage in order to avoid the following problems: change of scope and design, site condition problems, change of specifications that lead to the delay, slow progress of work and cost overrun.