The aim of this project was to create an additional armature of spaces to an original property of the Duchy of Cornwall Estate, within which various residential arrangements may be accommodated. This multifunctional space, incorporating areas for bathing, sleeping, working, living and dining without divisions, may oscillate between private and public use as desired. This was made possible by converting the undeveloped roof volume and extending it in glass, to continue the internal space onto the roof terrace. The absence of boundaries further permeates the scheme through the use of glass for the extended space; whilst continuing the lines of the revealed existing structure into the extended space, (aligning the main roof space with the external wash house) thereby blurring the boundary between interior and exterior, yet emphasizing the distinction between existing and proposed.