Painted wooden panels which connect together by means of a tongue and groove system on the vertical edges. The panels are double-sided, brick pattern one side and wood-framed on the other. Thin brown stained uprights are provided for wall-spacing and for turning corners. There are also window and doors with painted paper glazing. Walls are topped by H cross-section parts which act as the base for either the next storey or the gable pieces. Roof support beams sit in cut-outs in the gables, the roof boards having a groove which fits over them. Ridge parts and chimney sit on top.