The Keizer Karel College in Amstelveen (senior general secondary education (HAVO), university preparatory education (VWO and Gymnasium)) is a sister school of the Alkwin College in Uithoorn. After LIAG had carried out the extensions of the latter to the full satisfaction of the client, LIAG was commissioned to do the extensions for the Keizer Karel College.The building is a tidily designed school building with two floors and a number of inner courtyards or patios. An interesting point was that there were entrances separated by a patio. Having run out of space the school needed to expand.After a model study the choice was made to extend the north side of the existing building. The new wing was connected to the existing building by covering one of the patios. This joined the two entrances with an indoor ‘street'. The indoor street has become the new heart of the school, containing a recreational area, the study square, and with the passageways for the rest of the school leading off from it.The school building is close to a highway exposing it to a high level of noise and fine dust, which means that the windows may cannot just be opened. LIAG developed a special kind of window with an extra pane placed at 50cm from the façade which wards off the noise and fine dust from the highway and makes it possible to open the windows for the necessary ventilation on the north facing façade.The extension has a bright colour scheme giving the school a cheerful atmosphere, a place where students like to hangout. This is apparent from the fact that even before final delivery of this new wing the school requested a further extension on its roof. The building application for this extension has been submitted to the municipality.