Iranian Sustainable Building Scientific Association International Journal of Urban Management and Energy Sustainability 2538-1628 5 2 2024 04 01 Evaluation of confidentiality in the architecture of historic houses according to the concept of transparency in spatial structure (Case study: Historical houses of Tabriz Qajar era) 155 173 714031 10.22034/ijumes.2024.2030178.1215 EN Maryam Hasani Ph.D. Student, Department of architecture, Islamic Azad University, Shiraz Branch, Islamic Azad University, Shiraz, Iran Mohammad Parva Assistant Professor, Department of architecture, Islamic Azad University, Shiraz Branch, Islamic Azad University, Shiraz, Iran 0000-0002-1272-0684 Aliakbar Heidari Department of Technical and Engineering, Yasouj University, Yasouj, Iran Journal Article 2024 03 08 Traditional residential architecture of Iran has always been the basis for the formation of identity and civilizational culture due to its architectural qualities. The principle of transparency is one of the principles that have always been present in Iranian art and architecture, and along with it, the factor of culture and religion has always been challenging with a kind of transformation in the spatial structure of architecture that is evident in the Qajar period and its three periods of early, mid and late. The method of collecting information is documents and library. At first, according to the triple introspection introspection, spatial hierarchy and locating the type of spatial qualities and initial graphical analytics, and using A-graph software, the justification graph of case samples was drawn, then based on the geometric relations of space syntax, these variables were calculated in nine Qajar houses of Tabriz that were used to validate the calculations obtained from geometric relations Samples were analyzed in Depthmap software. The findings indicate that Ghadaki House with a score of 4 had the highest and Hariri and Salmasi houses had the lowest respect. The general result indicates that in the studied samples in the mid-Qajar period have the highest and the lowest degree of confidentiality due to the concept of transparency in the spatial structure. In Research The future can include the number of samples as well as climatic diversity in the research. https://www.ijumes.com/article_714031_57605415a9deac502045adc122011f2d.pdf