Abstract: A method of constructing of a transportable modular building comprises the steps of: producing in a factory at least one service module which enables a container transportation thereof and is advantageously provided with appropriate building installations, where its height substantially corresponds to half of its length; producing in a factory at least two horizontal segments of a frame construction, having the width substantially corresponding to the height of the service module and the length substantially corresponding to the length of the service module, and at least one vertical segment of a frame construction, having the height substantially corresponding to the height of the service module and the length substantially corresponding to the length of the service module; transportation of the service modules, the horizontal and vertical segments to the building site by means of a vehicle apt to container transportation; attaching the service modules and the building segments together on the foundation of