The manual outlines the basics of calculating and designing wood and plastic structures. The main attention is paid to modern glued structures, which have found the greatest use in domestic and foreign practice. Physical and mechanical properties of wood and structural plastics, types of joints and their calculation, methods of calculation of enclosing structures made of wood and plastics, bearing structures - beams, posts, arches of frames, trusses, etc. are considered. The basics of the technology of manufacturing, installation and restoration of structures are illuminated.