Abstract:The traditional cost control method exhibits several problems, i.e., nonsimultaneous quality and cost optimization, low cost prediction accuracy, and poor cost control effect. Therefore, a method based on BIM for the cost control of reconstruction projects is proposed in this work. The gray system theory is used to forecast the concrete problems associated with construction cost, and the construction cost-related information data of each period is used as the model data base. The dynamic model of cost control is constructed in combination with BIM technology. Then, the relative importance of each cost index is set by introducing a discernibility matrix. The relationship between the different indexes of construction cost is further investigated, and the rules underlying the connection between subcost and total cost are obtained. The control strategy is developed in accordance with the identified rules, and the cost control dynamic model is adjusted to dynamically control construction cost. Experimental results show that the cost prediction accuracy of the proposed method consistently exceeds 75% and that the fitting degree between the cost control result and the actual value reaches 95%. The proposed method has better control performance than the currently applied method.