The 25th anniversary of the building physics research group was celebrated at the Finnish Building Physics Conference. The research group was founded in 1994 in Tampere University of Technology. Research has been moved in a more sustainable and goal-oriented direction, and new equipment and methods have continuously been developed alongside research. Much has happened during quarter of a century, and this was revisited in further detail in the celebratory speech, which opened the conference. To celebrate, an excursion to Hervanta was organized on Monday, where attendees had the chance to familiarize themselves with the research group’s current research methods and equipment. During the cocktail party there was also special program related to the theme and some old members of the research group were present.