The “Wall-Window House” is an apartment for two independent families, each occupying one floor. Set within a dense urban context, the project addresses daylight, privacy, overlooking, and sun control. Here, the window is not an element added to the wall, but the result of transforming the wall itself. Openings are created by removing parts of a continuous façade, shaped according to human scale, views, privacy, and light. Thus, windows follow no fixed pattern, but respond to each family’s needs and lifestyle. On the west façade, openings are limited by solar exposure, while on the north, they are restricted by overlooking. Reflective flooring carries daylight deeper into the interior. The existing domino structure allowed the relationship between wall, window, and interior to be redefined. Where the wall gains depth, the window becomes an in-between space, reproducing the qualities of terraces and courtyards. Brickwork reveals these spaces through the depth and voids of the wall.