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Optimal planning of construction projects requires an efficient allocation of available resources. Labor, material, equipment are to be planned, coordinated and quickly adapted to varying conditions. Frequent (design) changes during the construction period, diversity of trades and the high complexity of interacting processes in building manufacturing require innovative ways to support process-influencing decisions -a tool which allows testing interventions and adjustments in the manufacturing process, including individual sub-processes with the best possible efficiency. In this context, the discrete-event simulation comes into place. A research group simulated the manufacturing process of a hotel project in all details in order to examine applicability of simulation in the construction industry and to scrutinize and adjust it according to the construction specifics. The approach taken, the challenges encountered and insights gained will be presented in this article. FUNDAMENTALS Design Phase of BuildingsIn order to realize a project successfully, an integrated and well-considered planning is essential. The understanding of the term "planning" within the AEC industry usually considers only the building design. The client commissions architects and engineers to design a building. They create the geometric shape of the building, choose the needed materials and roughly estimate cost. The definitions of the scope of work and the corresponding work phases of the German Fee Regulation for Architects and Engineers can be used as a template for the different planning steps.In addition, all laws and regulations for the manufacturing of buildings must be taken into account. The design varies in detail depending on project size and type. If there are no changes or additions during the further project development, the building design is usually very dedicated and consistent. Deficits occur in details only occasionally, for example, if the understanding among designers is insufficient. Designers add corresponding specifications to the building design to complete it. Then, the design task is supposed to be fulfilled sufficiently.