New additions to historical buildings demonstrate that historical continuity proceeds, by creating an interface between the past and the future. The progression of historical continuity provides the relationship between different periods. New additions that provide historical continuity are important both in terms of the connection they establish with their surroundings and in terms of the continuation of the functionality of historical buildings. However, how the new addition design should

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... te to the historical building is a frequently asked research question in the field of architecture. With this study, it is aimed to clarify an important research topic in the field of architecture by evaluating the compatibility of historical buildings and new additions with each other through the newly developed tangible method. An original analysis method has been developed to measure concretely the degree of compatibility of the new addition within the scope of new addition design for historical buildings. This method consists of three phases. The first phase is Architectural Character Analysis; the context of the existing building has been examined and supported with visuals. The second phase is Conceptual Analysis; forty different criteria (design and value concepts) have been determined by literature research and their being the same or different have been examined. In the third phase, the numerical data in the conceptual analysis have been marked on the color chart. By using this unique method, the compatibility test between the historical building and additional building has been conducted and the relationship between them has been numerically revealed. Within the scope of this study, the notion of new addition is considered as additional structures used and interacting with the existing building. To test the development of additional building design according to architectural design; It has a scope based on architectural design criteria, principles and concepts. Within the scope of the study, the example of the Elbphilharmonie Cultural Center has been examined and analyzed with the method created. As a result of the analysis, the degree of compatibility between the historical building and the new addition has been determined. Thus, the evaluations at the qualitative level have been transferred to the quantitative level with the graphics created and contributed to the easier reading of the structure.