House Extension for Cellist is a minimalist renovation located in Chaville, France, designed by Cut Architectures. The construction is a concrete volume inserted between the western façade of the existing house and the neighbor’s house, offering an entrance and a desk to the whole house. Aligned with the bedrock of the existing house clad with anodized expanded aluminum panels hiding the glazed entrance door the extension is based on the same design principle as the previous one. A concrete frame echoes the previous project and the painted frames of the windows of the existing house above the expanded aluminum panels.