Located inside Changdeokgung Palace, Nakseonjae Hall is a one-storey structure built in ikgong style (bird wing-shaped eaves placed on top of the pillars) with a hip tiled and gable roof. It has 6 kans in the front and 2 kans to the sides (kan: a traditional unit of measurement referring to the space between two columns; roughly 2-4 meters). It originally belonged to the nearby Changgyeonggung Palace, but came to be considered a part of Changdeokgung Palace in more recent years.
The hall was constructed in 1846 (12th year of King Heonjong’s reign) and it is collectively called Nakseonjae together with the adjacent Seokbokheon Hall and Sugangjae Hall. The main gate of these three buildings is
known as Jangnakdang, which consists of 12 kans of namhaenggak (south corridor building) at Nakseonjae. Upon entering the gate is an extensive yard leading to Nakseonjae. Of the 6 front kans, a single kan on the far right side protrudes out to the front to create a balcony-like loft. Meanwhile, the main building features an ordinary housing style with square foundation stones and pillars placed on top of a rectangular stone base. The furnace and the surrounding areas beneath the loft are marked by unique mosaic decorations of irregular lines and the kitchen doors feature diverse design patterns.
At the back of the building is a flower garden made by stacking large stones. The chimney, the flowers, and the oddly shaped stones harmoniously blend into one another to create an outstanding landscape gardening. The interconnected Seokbokheon Hall also has 6 kans in the front and 2 kans to the sides and it is a part of ansarang (inner reception room). The outer corridors skirting the building lead to Sugangjae Hall, which is 15 kans in size.