This project consists of an extension and interior design of a monumental house in Utrecht. The aim was to not let the house lose its monumental character. By leaving a gab in between the extension and the original house the new and the old become volumes on their own. The difference in material of the monumental red bricks and the dark grey aluminum cladding enhances this effect on the outside. From the inside the gab makes it readable where the original house stops and the addition starts in a more subtle way. In between the two volumes indirect light enters the living room through a one piece roof light making a gradient on the white walls. The extension ends in a three parts sliding door covering the full width and height of the living room. Two thirds can be slid to the the side so there is a perfect square opening towards the garden.