This residential nursery school extension provides space for an additional group of children in an independent structure. The low-energy building is in a highly insulated prefabricated timber frame construction. The individual elements - one for each of the narrow ends, two for each of the long faces were assembled on a concrete base and are subdivided by posts (at 1.26 m centres) and rails. The load-bearing structure is exposed internally. Externally, it is legible in the form of the vertical aluminum cover strips.