These houses of steel, wood and glass were built on a very narrow site. Rooms in the symmetrical open ground plan are zoned by means of built-in beechwood cupboards the IPE200 galvanized steel frame permits column-free interior spaces. Steel tube provides horizontal bracing, the vertical bracing is visible in front of the external walls. The building envelope consists of highly insulated timber panels and fixed, frameless insulated glazing. Bent aluminium profiles hold the glass in the panels. The fully glazed east and west gable façade capture sunlight.