The aim of the study was to analyse the character of the urban built-up area in Krnov on the basis of the tax returns of the Carolinian Cadastre, takes us to the middle of the 18th century. The testimony of the tax investigations can be topographically specified thanks to the confrontation with the records in the land registers, and thanks to this it is possible to characterise the development of individual parts of the inner city relatively accurately. The Carolinian Cadastre clarifies our idea not only of the height level of the built-up area and the building materials used, but also of the functional composition of the interior spaces of the burgher houses, the farmyard buildings, and their further economic use. Based on the interpretation of the records of the tax assessment, it can be concluded that the burgher houses in Krnov were already largely stone before the middle of the 18th century, even in the parts of the built-up area of the town at the city walls.