The project was developed within the scope of a master's in Industrial Engineering, at the Department of Production and Systems of the University of Minho, in order to describe the research project carried out at the company Rangel Distribuição e Logística, S.A, belonging to the Rangel Logistics Solutions group. This project arose from the fact that the company needed to expand its storage capacity, ensuring sufficient space for the operation of its main customers in the following years using in its main warehouse located in the North of Portugal. The research methodology followed was “Action Research”. Therefore, this study began with the literature review, where issues related to the warehouses and their design were analyzed. Subsequently, the logistics processes of each of the customers under study were described and analyzed and the problems of each of the customers that could impact the new layouts were identified, highlighting the high occupancy rate of the main warehouse, whose available capacity would not be cope with future demand. Solutions were developed for the allocation of products for each of the customers, taking into the operational, business and customer requirements. Different scenarios were explored in an integrated approach to define warehouses layouts, storage spaces, equipment and resources required to the operation. An integer Programming model was developed for the dimension of the storage spaces. This step assisted the calculation of the number of workers and handling vehicles needed for each scenario created. A financial study was carried out in order to select the best option for the allocation of the products of the 4 main customers under study. The solution presented allowed a reduction of the occupancy rate of two main customers in pallets and boxes from 94% and 66%, to 50% and 45%, respectively. For the allocation of products associated with other customer, its occupancy rate was reduced from 101% to 43%. In addition, the warehouses selected for this new allocation have the flexibility to receive new customers or expand them in the future.