Eleventh and twelfth grade were added in 1995 and 1996 respectively with the first graduating class being the class of June 1997.

Stained glass was added in the east and west windows in 1862 and 1894 respectively.

The north and south doorways were added in the 14th and 15th centuries respectively.

Pharmacy and Leather Technology were added in 1978 and 1986 respectively.

Aluminium and carbon fiber frames were added to the product line in 1996 and 2000 respectively.

A notable external porch and the belfry were added in the fifteenth and sixteenth century respectively.

A north and south wing were added to the castle in 1899 and 1902 respectively.

The south and north wings were added in 1966 and 1971 respectively.

The chapel and former school building, now part of the local library, were added in 1885 and 1906 respectively.

In 1928 a ninth grade was added, in 1930 and 1931 10th and 11th grades were added respectively.