There are a lot of challenges to overcome with existing structures, and the complexity of the measures is often greater than with simple new buildings. In the case of listed buildings (monuments) in particular, it is important to maintain or restore the load-bearing capacity as well as the external appearance. One method that offers a number of advantages is the strengthening with carbon reinforced concrete (CRC). Thanks to the thin layer thicknesses, even filigree structures can be retained without a decisive interference in the appearance. In addition, a lot of extra weight can be saved and the moisture introduced can be reduced. This is ideal not only for monuments, but for steel-reinforced concrete structures in general. Strengthening of steel-reinforced structures with CRC in Germany is regulated by a general building approval (abZ) issued by the German Institute for Building Technology (DIBt). This so called CARBOrefit® method (formerly TUDALIT®) can be used without the need for individual approvals, which offers a cost-effective, fast and simple solution to strengthen existing reinforced concrete structures. Based on current examples of application the procedure, implementation and results of this method are shown. Therefore, an overview of the individual components and the performance of the method is given. Also, the minimally invasive treatment of the substance and thus the compatibility with the protection of historical monuments is presented. The article calls for greater use of these processes and thereby to contribute to the protection of our environment, as an extended operating lifespan of buildings helps preserve a considerable number of resources.