Labor contributes around half of the construction project cost (approximately 60%), which make labor management becomes an important element in project cost control. The purpose of project cost control is to get the early detection of any possibility of cost variance from the budget (cost overrun) so that corrective actions can be taken as anticipation. The objective of this research paper is to identify the causes of labor management cost variances and corrective action recommendations. In analyzing the cost variance, we need to identify the main problem first, and then take the corrective actions to eliminate the negative cost variance, so that the performance cost will improve. The approach to serve that objective is by conducting surveys to building construction projects in order to identify the cause of project cost variance in labor management, and by interviewing experts in order to obtain recommendations in taking corrective actions. The method analysis used in this research is Delphi method. The result of the research shows that the corrective action towards the variance of the labor management cost is actually a preventive action (before process action).