Engelund Thomsen, K.K.Engelund ThomsenWittchen, K.B.K.B.WittchenErhorn, H.H.ErhornErhorn-Kluttig, H.H.Erhorn-Kluttig2022-03-072022-03-072009https://publica.fraunhofer.de/handle/publica/294328This study deals with the benefits and limitations of thresholds related to the 1000 m2 limit for existing buildings that undergo major renovation and the two 25% rules regarding the definition of major renovations.en690report