The thesis shows practical ways of evaluating construction costs, which are necessary for the investor to be informed of expected final value and thus be able to make decisions about the intent of construction. In this context, we examined the laws and building regulations, which currently deal with the quantity surveying of designer documentation. This is followed by a look at the purpose of quantity surveying, its composition and the importance of its correct formulation due to the potential impact on the change in the contract price. Finally a cpecific construction of a structure is considered with a brief introduction of the site and the comparison of the actual cost of construction with the designer's extimate. Based on the comparison of the final bill and the construction book, the most divergent values of individual items are identified and the cause for divergence is established. When ckecking the quantities set, we used the software CostX, which as proven to be a particularly suitable tool for faster electronic surveying and ease of documentation.