The house itself is a simple rectangle in plan. Common areas are located on the first floor, seamlessly extending to the swimming pool and outdoor terraces, while the bedrooms occupy the upper level, capturing sweeping views of the surrounding hills in the Piracicaba region. A pre-existing stone wall is a central feature of the site. The new building was sited to honor this element—preserving its character while clearly defining the contemporary additions. The clients requested a concrete house, therefore to optimize construction efficiency, a modular system of reusable plastic formwork was employed, reducing material waste, lowering costs, and avoiding the extensive use of wood typically required for formwork in this region. The result is a building that harmonizes with its steep landscape, celebrates the site’s history, and embodies a thoughtful, resource-conscious approach to construction.