The design of the interiors of family house in Gniezno (Poland). The metamorphosis of the interiors consisted in complete change of building’s layout, staircase modification, style and material changes. The new layout resulted in obtaining large, well illuminated open spaces. The use of natural finishing materials and universal colors gave the interiors a modern look, maintaining the warmth and character of a family house. The construction works of the metamorphosis took only two months.