The 1913 residential building in the former Train barracks in Münster is part of a heterogeneous ensemble reflecting the transformation from a military site into today’s garden suburb of Weißenburg. The renovation treats the existing structure as a culturally significant layer and develops it as continuous architectural transformation. From the solid brick volume a new spatial condition emerges, unfolding into a glazed lantern in the reconstructed mansard roof. Old and new are not opposites but merge into continuity between material and light. The historic fabric remains legible while extending into a new geometric order. A central vertical void with a delicate staircase draws daylight deep into the building. An open attic with permeable light floor extends this effect, connecting all levels into a continuous sequence. Movement through the house becomes a progression of light culminating in the studio beneath the roof. The project follows a low-tech strategy: natural ventilation through the central void, supported by a roof window, creates a chimney effect and reduces systems to a minimum. The massive brick structure acts as thermal mass stabilising indoor climate throughout the year. Materials and construction follow principles of reuse and continuity. Existing structures were integrated, historic bricks reused, and the roof reinterpreted as lightweight steel and timber hybrid. The building becomes a layered continuation of its own history a transition from brick to light.