This volume presents peer-reviewed contributions from the International Conference on Moisture in Buildings (ICMB), held in Guimarães, Portugal on October 23-24, 2025. The event brought together engineers, scientists, researchers, and practitioners, providing a forum for discussing and disseminating the latest developments and achievements in the field of moisture in buildings. The topics included but were not limited to monitoring & modelling of moisture in buildings, digital tools for moisture control in building construction (including BIM, IoT sensors, and AI), and ventilation, airtightness & moisture in buildings.