In the graduate thesis, we made a preposition of energetic renovation of an old homestead, which was built in 1869. A preliminary study was carried out to assess the situation. We took measurements of the building, which we have used in the preparation of plans and construction sets. With the help of the web site www.u-wert.net, we made an analysis of the energy balance. After the analysis of the current materials and with the help of the geometrical characteristics, we made an analysis of the energy performance. Energy performance calculations were carried out with the help of a software tool known as TOST, which is devoted to calculate energy balance of a building by PURES 2010, SIST EN ISO 13790 and TSG-1-004:2010. The energy performance of the current situation was not appropriate, the results were expected. After the energy performance calculations, we made the analysis of insolation with software tool SketchUp LSS Chronolux. With its help we analysed the effects of insolation at chosen points on building envelope. After the analysis of insolation, we prepared a preposition of energy renovation of the old homestead. We carried out energy renovation with energy efficiency improvements and retained the current appearance of the homestead in the best possible way. We calculated the energy performance for two different modes – depending on the position of the thermal isolation within the exterior wall. With preposition of energy renovation we improved energy efficiency of the building. Energy performance of both cases – position of thermal isolation on the outside or on the inside was suitable, differnces were small - approximately ten percent.