This intervention to a 1970s detached house focuses on the grey energy of the building as a point of departure. Limited to local amendments to bring the building to current living standards, the project aims at the largest transformation through the minimum means. The volume is simplified by the new roof, which eliminates the intricacies and overhangs of the original, but fenestration remains unchanged. The upgrading of the envelope through external insulation crystallises the reinvention of the whole through the mix of grains of the render, applied as a series of geologic strata wrapping around the house, based on the datum of windows, parapets and other façade elements.