In a context of continuous innovation, using combined materials for the construction of new structures is a frequent phenomenon. However, it is common to think of mixed steel-concrete structures rather than mixed timber-concrete structures as, in the collective imagination, timber is considered the least durable material. This thesis aims to propose a correct structural and technological redesign of an existing residential building by combining materials such as timber and concrete followed by a comparison in economic terms between the existing reinforced concrete structure and the redesigned one.