The brief was to provide an additional living space to the rear of a semi detached house in the suburbs of south County Dublin. The insertion repsonds to a number of factors on the site - the language of the existing building, the granite wall enclosing Leopardstown racecourse at the back of the garden and the sun. The language of the tiled pitched roof of the existing house is continued, re interpreting this idiom and expressing it in how the shape of the tiles are shown around the edge of the roof - sometimes the corrugation is shown, sometimes the stepping profile. We stood back from the granite wall, and made a corner window looking at the wall and facing south, the only south facing window in the house.