| Title |
Planimetric Preservation and Volumetric Change in Streetscapes Under Designated Building Line Planning in Downtown Seoul |
| Authors |
한유진(Han, Yoojin) ; 박소현(Park, So-Hyun) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.10.27 |
| Keywords |
Downtown Seoul; Designated Building Line; District Unit Plan; Street; Street space; Newly Constructed Building |
| Abstract |
This study analyzes the characteristics of Designated Building Line(DBL) Planning and its implementation in 70 newly constructed buildings
across 10 District Unit Plan areas in downtown Seoul. In these areas, the DBL planning serves as a tool for preserving the shape of historic
streets and alleys, aiming to maintain the distinctive urban fabric and streetscape. Simultaneously, the DBL plans are implemented as aging
buildings are replaced with new developments that accommodate higher density and modern functional demands. This study therefore
examines the implementation of DBL planning and the resulting transformations of the three-dimensional streetscape while the original
planimetric street layout is preserved. In order to preserve the shape of streets, the 10 District Unit Plans specifically designated DBLs along
street-side property boundaries. However, in streets narrower than 4 meters, building line setback exemptions significantly influence plan
implementation. Changes in three-dimensional streetscapes were analyzed across two aspects: changes in building scale and street-level
configuration. The results show that while DBL plans strictly preserve the original street layout planimetrically, some cases exhibit substantial
changes in building height and floor area ratio, whereas others maintain a scale similar to that of the previous buildings. Street-level
configuration also vary among the study areas due to the influence of other planning provisions and practical conditions such as building
uses, parking requirements, and topographical features. These findings suggest that DBL planning should extend beyond preserving planimetric
layouts by incorporating three-dimensional changes, allowing it to function as a more comprehensive design and management tool for
strengthening the spatial identity of central Seoul. |