New extension primary school De Wissel in solid timber is in use

Commissioned by GPO-WN, Solid Timber has taken care of the solid timber main supporting structure for the extension of the reformed primary school De Wissel in Utrecht.

This extension will consist out of the addition of 3 extra classrooms and a new entrance in connection to the existing structure. On the inside of the classrooms, solid timber CLT surfaces of both walls and ceiling are deliberately chosen to be completely in sight. The natural moisture accumulating operation of the wood will thereby contribute to a controlled humidity of the indoor climate, thus reducing the chance of headache, loss of concentration and dry eyes of the children are limited to an absolute minimum.

The construction and design of these classrooms is also a pilot project for GPO-WN to build as much as possible with natural materials in the direct learning and working environment of the children.

The construction is realized from July to September 2017, during which the assembly of the solid timber main supporting structure took only 3 days, including unloading of the panels, to complete.

Photo: Ossip van Duivenbode –


Client: GPO-WN

Architect: Sineth Building maintenance

Engineer steel structure: Pensera

Engineer timber structure: Solid Timber

Main contractor: Middelwateringbouw