Nowadays, yachts can reach very high performances and the discovery of new technologies will allow to achieve even better ones. Therefore, building quiet yachts with the lowest possible vibration levels has become the new challenge. To propose the most cost-effective solutions to its clients, RINA predicts noise and vibration levels onboard. Using simulation software allows to detect in advance the most critical areas of the ships, thus reducing the need of costly countermeasures late in the design phase. Finally, RINA evaluates the noise and vibration levels onboard to certify that the yacht is compliant with the specified limits. The work presents a test case in which RINA performed a full study on a yacht.