The main topic of the book is an analysis of building accounts from the years 1372-1378. Contrary to older literature the study treats the accounts as a homogeneous source where allthe entries are related to each other. A systematicalsynchronic and diachronic collation of the records reveals interpretative limits of the source and enables to describe the building activities week by week. Besides the activities of different participating crafts, the accounts inform about prices of building materials, tools, salaries, currency rates, carrying capacity of carts, building terminology etc. With the help of other not only written sources, we get an overview over supplies of raw materials from Prague hinterland including information about interaction between different crafts employed at the construction site and economical aspects of medieval building.