Lifestyle is a concept that generally includes social, economic, and cultural components. It has a great influence on the introduction of people behaviors and attitudes in a community. According to various scholars, lifestyle is closely related to the quality of life. An example of lifestyle is quality of location and living space affecting the architecture of house interior. This study aimed at investigating the effectiveness of aristocratic lifestyle in Qajar era in the spatial areas and relationships of their houses. Research method was historical and interpretive analysis. The data were based on library and field studies consisting of documents and narrations. To select the samples, all houses related to the Qajar period, which had documents and the possibility of field studies were provided, were investigated. In this study, nineteen houses in the Mazandaran and Golestan were selected which had the highest impact on the spatial relationships considering the change in lifestyle. The research results showed that lifestyle changes in the social, economic, and cultural areas have led to the development of architecture of houses, which are embedded in social relationships, family structure, economics, occupation and social identity and the impact of each of these components on the structure of spatial relationships. After reviewing the spatial layout of selected houses, justified graphs were used for their analysis based on space syntactic attitude and the houses of each Qajar period were compared This is the result that Houses in the Qajar era differ in the types of spaces and how they relate to each other and according to these differences are divided into different categories تفاصيل المقالة