Advancements of recently developed timber products such as cross laminated timber (CLT) and its increasing application in construction demand economical standardization and unification. Therefore cost calculation of solid wood building systems need to be established. Following the systematic analysis of operation procedures, a research project was carried to gain accurate data on effort and performance values for future cost calculations. The absence of specific literature on cost calculations of timber buildings leads to evaluations based on in-house knowledge without cross company references. So a data acquisition on labor costs and machinery expenses on site is required to obtain primary data and input parameters in the cost calculations. Because of the high grade of prefabrication of timber structures, labor costs are the leading influence parameters. The methodology according to the technique of REFA and the specific circumstances of the timber installation process were implemented into the analysis to generate an appropriate system for the examination of these new building systems. To create a feasible and applicable database of values performance factors and activity values have been examined on site, interpreted and edited for future cost calculation of cross laminated timber assembly works. This survey on site contributes another module in the lack of knowledge to optimize the construction management within the construction process of large scale timber buildings.