Due to growing student numbers and the expansion of the G9 system, the high school is being expanded. The guiding principle behind the concept is the logical continuation of the existing structure. The striking cubature of the Freiherr-vom-Stein-Gymnasium is being supplemented by an additional building block that reinforces the qualities of the existing structure.

On the south-east side, a free-standing structure measuring around 12 x 62 metres is being built, which is connected to the existing building by two bridges (skywalks). The existing school garden, which has to make way for the extension, will be relocated to the north-east side of the site. There are functional changes to the existing building, but structural changes to the existing building should be avoided.

The façade will be designed in line with the existing façade. The characteristic ribbon windows will be continued in the planned extension. In order to respond to the colours of the existing building, some of which have already been faded by the sun, the new building will be coated in a bright yellow. The colour scheme from the existing building will be adopted and continued in the same way, from dark green to yellow. The skywalks are a gradual transition from green to yellow and avoid a hard transition of colours between the new and existing buildings. The skywalk thus becomes a kind of ‘portal’ from old to new.