Various conservation implementations are carried out in archaeological sites reflecting the settlement characteristics and values of the area where they are located. It is seen that conservation implementations are commonly carried out in theatres, temples, fountains, baths, churches and bouleuteria. Bouleuteria are council buildings generally planned close to the theatre and in connection with the agora. These structures with a public function, where public assembly convened, have a square or semi-circular plan, and are covered. Bouleuteria bear importance as they were frequently used during the Greek and Hellenistic periods. During the Roman period, the need for this type of structure faded away and the existing bouleuteria were utilised as odeions. Some of the bouleuteria are used today for open-air gatherings, and for this reason conservation implementations are carried out. In this study, the architectural features of the Bouleuteria of Iasos, Patara, Ephesus, and Kibyra and the impacts of the conservation implementations were examined. The effects of implementations changed depending on whether the scale of the implementation was partial or comprehensive. The materials and techniques used also varied according to their compatibility with the authentic condition. As a result of the evaluation criteria, it has been determined that conservation of original values at the structure scale can be achieved by making plans depending on the condition of the original remains.