The rich accumulation of historical and cultural mosaic of Anatolian geography can be found in Rize. The examples of civil architecture in the region have survived to the present day, largely without deteriorating their original qualities. The preservation of the historical urban texture in the region where the historical wooden structures that defy the centuries are intense are of great importance in terms of transferring to future generations and maintaining the cultural memory. There are not many studies in the forest industry engineering literature to determine the damage and defects in historical wooden structures and to protect the original texture of these defects. Within the scope of the study, a research was conducted in Cinan mansion, a 200-year-old wooden mansion in Rize Pazar district. In this study, the damage and defects in the historical wooden structure were determined by non-destructive test methods. In addition, screw holding, shear and elasticity modulus of the wooden carrier beams in the structure were determined. With this study, it is aimed to determine the defects and damages in historical wooden structures and to develop appropriate protection techniques that can contribute to the solution of the problems encountered. In addition, it is aimed to be able to intervene without damaging the texture of the wooden structure and to ensure the sustainable use of historical wooden structures for many years.