The objective of this research project is to perform a cost estimation of the re-entry module within the Space Rider system, designed and developed by Thales Alenia Space in Turin, Italy. Space Rider is a reusable space transportation system designed to offer affordable access to space. It includes a re-entry module capable of landing and being prepared for subsequent missions, significantly reducing costs. The study begins with an overview of the current state-of-the-art in space systems analogous to Space Rider. Subsequently, various methodologies for estimating costs of space systems are explored to determine the most suitable approach for this specificcase.