Technology follows Construction – Potentials of low-tech buildings. Modern energy-efficient buildings are defined by a high degree of installed technology. Thanks to their versatile use, such buildings are perceived as comfortable and of higher quality. The legal requirements and subsidies also steer the trend of future buildings toward a high degree of energy-efficient technology. However, the guiding principle is: the best energy is the one which is not consumed. A paradigm shift toward sufficiency should be initiated in order to take grey energy into account and actually create sustainable, future-proof buildings. One trend in particular should be highlighted: low-tech buildings. They follow the principle of first fully exploiting the potential of the building structure in terms of building physics and then supplementing the required residual energy with technology. They could be defined by the guiding principle: Technology follows Construction. Low-tech buildings are not only beneficial in the context of climate change, they also offer economic solutions to challenges such as social acceptance of energy-efficient measures, social sustainability and post-pandemic. Thanks to the increasing number of successful practical projects, low-tech buildings are gaining in importance.