Construction of multi-storey timber buildings represent solution to the global housing shortage which is caused by the increased urbanization and the densification of cities. Three-storey timber building with the platform framing method of major structural member’s joining of was considered as an object of investigations. The length and width of considered building were equal to 28 and 13 m, correspondingly. Simplified approach of load-bearing shear wall modelling, which is based on the replacement of the shear wall structure by the lattice structure with the equivalent stiffness, is presented. FEM models were developed by the softwares ANSYS 15.0 and Autodesk Robot Structural for verification of developed simplified approach. It was stated, that the difference between the horizontal displacements obtained for single member of shear wall structure by the developed simplified approach and developed FEM models does not exceeds 5%.