Urban passageways represent foundational components and vital spaces within the fabric of historical cities. In Iran’s hot and dry climate, these passages typically feature mute, simple walls finished with thatch-and-mud plaster. Amidst these muted streetscapes, gateways (portals) serve as the most prominent architectural elements, delineating the boundary between public urban space and private domestic realms. Although numerous studies have investigated entrance spaces and historical gateways of religious and public monuments across various Iranian cities—as well as non-residential historic sites in Qom—the residential gateways within Qom’s historical fabric have remained unexplored and systematically undocumented. Accordingly, this study aims to represent, identify, document, and classify the gateways of Qom's historic houses across the timeline of historical developments. The methodology employs a hybrid approach, combining literature reviews to extract architectural components, decorative motifs, and typological frameworks with a comprehensive field survey across all passages of Qom's historical core, during which over 200 historical gateways were identified, photographed, and documented. Subsequently, the field data were systematically analyzed using comparative analysis, morphological matching, and classification techniques. The findings indicate that Qom's historical residential gateways exhibit diverse structural and formal patterns, which can be chronologically categorized into two primary periods: the Qajar era (subdivided into Early and Late Qajar) and the Pahlavi era (subdivided into First and Second Pahlavi). By extracting and documenting formal and decorative typologies, the outcomes of this research significantly contribute to architectural dating, the understanding of spatial-morphological evolution, and the guidance of principled conservation, restoration, and revitalisation strategies within Qom’s historic urban fabric.