Among the various factors that predispose TEB projects to cost and time overruns, consultant related factors have been fingered as one to be recognized. Others include contractor related, owner related and external factors. In order to achieve the aim of this study, which is to determine the order of influence of the consultants related factors on the performance of selected TEB projects, mean item score and student T-test were used for the analysis. The perceptions of key construction stakeholders from 4 selected tertiary institutions, chosen consequent upon the record indicating a huge allocation received by these institutions from the federal government for capital projects, in the Southwestern part of Nigeria were sought. The reliability analysis carried out on the constructs show values of 0.862 and 0.946. It was found that delayed supervision & slowness in making decisions coupled with the absence of consultant’s site staff are the top two consultants related factors that predisposed TEB projects to cost and time overruns. The factors cut across the TEB projects procured under both open and selective competitive tendering methods. Timely supervision with quick and prompt decision making therefore enhances building projects performance.