The aim of this work is to show the possibility of a return to the traditional construction of walls from clay and straw in contemporary building construction characterized by high functional requirements. The introductory part summarizes the roots of natural building with clay and straw. It explains the basic technologies of building with clay and presents selected technical parameters of partitions made ​​in the technology of straw-bale. Then, the results of preliminary tests on selected aspects of the sustainability of partitions made ​​of clay and straw, carried out within the framework of engineering work done under the supervision of the author of this work. The tests were performed under the two types of specimens prepared with different technologies - heavy clay with the addition of straw and straw-bale. It has been shown that it is possible to obtain a good frost resistance of clay with the addition of straw. Also the resistance of water penetration can be effectively improved with easy to implement and low-cost coatings.