In architecture, restrictions often become the starting point for innovation. For Slope House in Poland, a planning regulation requiring a traditional pitched roof became the catalyst for the project's most defining idea - a roof that doesn't simply cover the building, but extends outward, folds toward the ground, and transforms into a walkable landscape that gives the house its name, its form, and its character. Designed by architects Artur Baranowski (SOURCE) and Ivan Boltulenis (SA-BI), the single-storey residence treats the boundary between wall, roof and terrain not as a fixed condition, but as something to be dissolved.
From the street, the building appears almost monolithic. Smooth white surfaces clad in ribbed fibre-cement panels slope downward, enclosing the house in a calm, protective shell and giving it a quiet presence within the rural setting. At the intersection of the building's volumes, a narrow canyon-like passage carved between the sloping planes discreetly conceals the entrance, gradually drawing visitors away from the outside world and toward the interior. "The entrance sequence was conceived as a ritual of passage – a moment that separates the rhythm of everyday life from the calm and intimacy of the home."
Beyond this restrained exterior, the house reveals an entirely different character. At its centre lies a private courtyard that acts as the spatial core of the project, bringing light and nature deep into the interior. The inner garden organises the plan into two distinct zones. On one side, a service wing contains the garage and technical rooms. On the opposite side, a wing accommodates the bedrooms, creating a secluded retreat for the residents. Between these two volumes stretches the main living area – an open space combining the kitchen, dining room and lounge. Large sliding glass walls dissolve the boundary between interior and exterior, extending daily life toward a terrace and the surrounding orchard.
The most striking element of the house is the sloping plane that gives the project its name.
Rather than simply covering the interior spaces, the roof extends outward and gradually descends toward the ground. This gesture transforms the roof into a walkable slope, turning it into a fifth elevation and an inhabitable landscape.
Part terrace, part hill, the surface becomes a place for informal gatherings, quiet observation or even an open-air cinema beneath the stars. From its highest point, the surrounding countryside unfolds, offering views across the orchard toward the Vistula valley.
"Originally the house was meant to sit deeper within the site, but infrastructure constraints required us to move it closer to the street. The sloping roof became a way to recover the distant views – creating a private hill from which the landscape and the Vistula valley can still be experienced."
Material choices remain deliberately minimal to emphasise the sculptural clarity of the form. The palette consists primarily of white plaster, ribbed façade panels and light concrete surfaces, paired with silver-coloured sheet metal roof detailing and large glazed openings.
This restrained composition allows light and shadow to animate the architecture throughout the day, highlighting the shifting geometry of the sloping planes.
Inside, the simplicity continues: natural wood floors, panoramic glazing and carefully framed views establish a calm and open atmosphere that complements the landscape beyond.
What began as a regulatory obligation became the most personal part of the home: a place to sit above the orchard, watch the valley, and take in the surrounding landscape. It is the kind of architecture that works quietly, asking little attention for itself while giving a great deal to those who live within it.
Slope House is part of the SOURCE Signature portfolio - a collection of residential and cultural projects shaped by the same commitment to considered form and the specific character of each site. The full portfolio can be explored at source.works
