The current schoolhouse was built after the Great Fire of Turku in 1827. In 1830, the city of Turku also obtained a "gymnasium", a higher secondary school, while the older Catedral School became a preparatory school of the new "gymnasium". To reflect this, the name of the Cathedral School was changed in 1840 to "Högre Elementarläroverk", literally "Higher Elementary School". In the education reform of 1872, the "Högre Elementarläroverk" and the "gymnasium" were merged into "Svenska klassiska lyceum i Åbo", a Swedish-speaking classical school. In the 1970s "Svenska klassiska lyceum" and "Åbo svenska flicklyceum", The Swedish Girls' Secondary School of Turku, were united and the old school name Katedralskolan i Åbo, the Cathedral School of Turku, was revived.