This paper presents several case studies of reused and retrofitted buildings from Karlsruhe, Darmstadt and Heidelberg and their architectural-cultural integration in the surroundings. Reasons to replace missing parts of heritage buildings were motivated by new rules regarding materials, neglect or war damage state, but also by new developments in the neighbourhoods. Conclusions underline the impact on the surroundings of the altered buildings as being rather good. Also, the new developments which raised the profile of the surroundings would not have been possible otherwise. Reuse of buildings was justified by extension of the activities, new activities or social development. Through this the impact has been also rather good. Risks evaluation are identifying the questionable threat of the heritage character dilution in the intervention when several interventions are coupled.