Boiler house with chimneypipe and engineer’s apartment (1903). Architect Jacobus van Lokhorst designed the monumental building in a traditional building style. The boiler house heated a few buildings of the Polytechnical school (later TU).
In 2018 redesigned by Vakwerk architects with circular building materials. Glass functions as a transparent connection between old and new building parts, which have views to the monumental parts of the building. The building offers space for offices, conferences and catering. Located between TU and the city center The Vakwerkhuis is of social significance for the neighbourhood