Despite the excellent records of past Iranian artists and architects creating and designing different building types, the houses in which we live today bear no mark of the remarkable history and background of Iranian architecture; however, they may be “functional” in terms of use, “beautiful” in terms of visual appearance, and “rich” in terms of ornaments. Commonly, these houses are based on the unknowing imitation of modern western architecture resulting in the cities and houses which lack identity. Considered as buildings with completely Iranian architecture and ornaments, historical houses could inspire the designers in the design and creation of the spaces with a strong identity. The Qajar period could be called the age of substantial changes in Iranian society. The top architectural works of this age have emerged in the form of Houses. Therefore, it is of great importance to investigate the architectural elements of the houses created in this age. The main purpose of this study is to identify the significant architectural elements and study them in the Qajar period and the historical house of Daroogheh as the case study. This study is basic in terms of purpose and historical-descriptive in terms of essence and method. Furthermore, the data are collected by mixing the library and field study methods. The findings indicate that the significant architectural elements of residential spaces are light, texture, materials, geometry, form, view and landscape, space, and color and ornaments, and each one of these elements have specifically contributed to the architecture of the Qajar period and the house of Daroogheh; thus, by knowing about these elements, they could be used in the contemporary houses so that the lost identity will be brought back.