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ABSTRACT
Delivering building projects is seriously hampered by design variations. Design changes have historically had a significant negative impact on many projects, leading to issues like cost overruns, schedule delays, and decreased worker output. The purpose of the paper was to identify the reasons behind and consequences of design variations on the execution of building projects in Benin City, Edo State. A total of 86 questionnaires were distributed to twelve construction companies in Benin City that employed engineers, quantity surveyors, architects, and builders either as consultants or contractors. Only 74% of the distributed questionnaires were fully completed, returned, and used for the study. The results from the survey were examined using the descriptive analysis. The analysis's findings indicate that client- and consultant-related variables are the main causes of the variations in how construction projects are delivered. Construction delays, expense increases, sluggish project progress, and construction rework were among the major effects of design variation on infrastructure project delivery that were considered significant. In order to address design variations in Benin City, Edo State, the paper suggested elaborate project briefs, contractors' early participation in the design stage, multiple client reviews and approvals, detailed designs, and elaborate cost planning.
