Increase of ecological awareness leads to high significance of the sustainable building. It implies using the natural materials for the construction, and also care about safety, energy efficiency and using renewable energy sources for the operation of facilities. Therefore, construction of a straw house, as an example of sustainable building, has been analysed in this paper. Considering it is about a construction material which is classified as B2 - normally flammable materials, it was necessary to determine and describe the procedure of fire intervention and usage of fire-fighting equipment in the house of straw. Also, for a better understanding of the construction, the paper described the process of making the walls of baled straw and the method of the plastering detail. Specifically, it was shown that walls closed with plaster from the inside and from the outside have a very good fire resistance. Therefore, buildings of straw bales, applying the protective measures, can be considered as a safe from fire and sustainable at the same time.