The following report is aimed at describing the project activity relating to data analysis and sizing of a warehouse. The goal of the internship was the application of lean methodologies to the logistics system with the aim of improving its operational efficiency in terms of safety, quality and productivity. The work deals with the methodologies and aspects to be considered that underlie the choice, design and construction of a warehouse, highlighting all the factors that contribute to its sizing. The main problem to be faced in the sizing of a warehouse consists in the optimal use of the available surface in order to ensure the efficiency and effectiveness of the operations that take place there.