The aim of the bachelor thesis is to elaborate upon the technical data for the project of the attic implementation at an existing family house. The thesis deals with creation of the project documentation for the attic at the Soňa and Pavel Smetanek's single-storey house. The project offers more options. These suggested options can be complemented alternatively in case of a future staircase construction that can cause changes in the layout plan and the ceiling structure. The bachelor thesis consists of layout options of the first--floor arrangements and implementation designs of the second floor that functions as a living quarter. The last part of the bachelor thesis deals with the calculation of thermal transmittance coefficients of the bui...