The current building was finalised in 1914 and renovated in 1999. The school is famous for its Assembly Hall, which features wall paintings of Gustav II Adolf, king at the time of the school's foundation, and Aristotle.
Katedralskolan is proud of its traditions but seeks to stay up to date, as reflected in is motto: "tradition and development". Its affinity for tradition is evident in its logo which says Gymnasium Lincopense, the latin name used at the time when Katedralskolan was the only school in Linköping.
The school has many societies. Sällskapet för vitterhet och hävd - Eranos (known as VH-E), dedicated to history, literature and philosophy, has been residents to the school since 1795 and counts many famous names amongst its members, such as Jöns Jacob Berzelius and Tage Danielsson.
The school enjoys a fierce rivalry with nearby Berzeliusskolan, which ironically is named after Katedralskolan alumnus Jöns Jacob Berzelius. Katedralskolan has a reputation for being posh, while Berzeliuskolan is seen as more scholarly.