Despite extensive documentation of the benefits of involving FM professionals at the design stage of a building project in the literature, there are still a number of barriers to their participation. This study thus sought to investigate the perception of built-environment professionals in Lagos State of the impediments to the engagement of FM professionals. Three hundred and forty questionnaires were distributed to builders, engineers, architects, and quantity surveyors in the study area, and a response rate of 78 percent was obtained. The Mean and Kruskal-Wallis test were used to analyse the data, and tables were used to present the findings of the analyses. The outcome of the analysis using mean shows that all the built-environment professionals agree that the major impediments to the engagement of FM professionals at the design stage of a building project are: the belief that FM professionals are required only when construction is complete (mean=3.69), non-awareness of the advantages gained by engaging them at the design stage (mean=3.67), and discord between FM specialists' professional judgment and the client's desires (mean=3.57). Moreover, the results of the Kruskal-Wallis test indicates that there is no significant difference in the mean of the built-environment professionals. The study concluded, among other things, that FM professionals need to work hard to establish a presence within the built environment that will demonstrate their significance, if they want to succeed in today's fiercely competitive market.