APDI Architects Nestles a Laterite Villa into the Sacred Landscape of Suoi Hai Lake

On the outskirts of Suoi Hai Lake in Ba Vì, Hanoi, there is a 40,000 m² site with no neighboring buildings, no infrastructure noise, and a direct sightline to the Tản Viên mountain range, a massif so central to Vietnamese identity that it anchors the origin myth of Sơn Tinh and Thủy Tinh. APDI Architects, led by Nhâm Chí Kiên, placed a single-storey villa here in 2023 that reads less like an object dropped onto the terrain and more like a long, low geological formation that happens to contain bedrooms. The building hugs the earth, stretches toward the lake, and hides much of its mass under a living grass roof. It is a house that would rather be mistaken for a ridge than announce itself.

What makes SuoiHai Villa worth studying is not that it seeks harmony with nature (every second project brief claims that) but the specific, layered means by which it achieves it. Laterite bricks, formed from the same iron-rich soil beneath the site, give the walls a color indistinguishable from the exposed earth at the lake's edge. Three internal courtyard gardens fracture the plan so that "inside" and "outside" trade places multiple times along the building's length. And a pyramidal skylight at the apex of the central living volume turns sunlight into a material as tangible as the stone floor it lands on. The result is architecture that earns its site rather than merely occupying it.

A Roof That Disappears

Seen from a drone at dusk, the villa's angular roof canopy spreads across the clearing like a folded plane of terrain. Its grass covering, complete with a drainage layer topped with gravel, insulates the interior while visually merging the building with the surrounding meadow. From ground level the effect is equally striking: a long horizontal volume with a deep overhang sits in a grassy clearing dotted with young trees, and the roofline never rises high enough to interrupt the mountain silhouette beyond.

The grass roof is not decorative. In rural Vietnam's hot, humid climate, it functions as a thermal blanket that reduces solar heat gain far more effectively than a conventional metal or tile covering. Combined with the single-storey profile, it keeps the building's environmental footprint deliberately modest, a quiet counterpoint to the expansive site it occupies.

Laterite as Identity

The region around Suoi Hai Lake is known as the land of beehive rocks, a laterite formation created by millennia of mineral leaching. APDI drew directly from this geology: the villa's most prominent exterior walls are built from reddish-brown laterite bricks, their surfaces left deliberately rough to register the texture of the raw material. On the northern facade, these bricks are laid in a perforated pattern that filters light and drives cross-ventilation through the interior, turning a climate strategy into an ornamental screen.

The contrast between this robust, almost geological face and the southern elevation is deliberate. Toward the lake, the house opens entirely with continuous glazing and bamboo decking that steps down to a swimming pool. One side is fortress; the other is frame. The architecture mediates between protection from the elements on the north and full immersion in the landscape on the south.

The Central Living Volume

At the core of the plan sits a combined living, dining, and kitchen space crowned by a faceted timber ceiling that rises to a pyramidal skylight. The structure of this roof is the house's most dramatic interior gesture: dark wooden carpentry fans out from the apex in angular planes, creating a vaulted canopy that simultaneously compresses the edges of the room and lifts the center toward the sky. Afternoon sunlight drops through the skylight and tracks across the modular shelving wall and polished grey stone floor, marking time without a clock.

One textured laterite wall is left fully exposed inside this space, its rust-red surface providing a tonal anchor against the lighter timber and plaster. It is a smart inversion: the same material that forms the exterior shell appears here as an interior accent, collapsing the distinction between structure and finish. The room's floor-to-ceiling glass on the lake side ensures that the view of Tản Viên peak is always present, framed like a painting that changes color with the hour.

Courtyards as Ventilation and Intimacy

The villa's long, narrow plan is punctuated by three courtyard gardens, each a precisely composed rectangle of lawn panels, gravel beds, planted areas, and concrete paving. APDI describes these courts as "fragments" of the larger landscape that flow into the building, and the aerial view confirms the metaphor: green patches interrupt the roof plane as if the meadow outside had pushed its way indoors. Each courtyard introduces daylight and ventilation deep into the plan, eliminating the dark corridors that typically plague linear houses.

Programmatically, the courtyards also separate zones of privacy. The main bedroom sits to the west, guest rooms to the east, and the social core in between. Moving through the house means repeatedly stepping past a garden, a transition that resets the senses and reinforces the feeling that you are walking through a sequence of pavilions rather than a single enclosure. In the bedroom, sheer curtains billow over floor-to-ceiling glass doors that open directly onto one of these courts, blurring the line between sleeping and being outdoors.

Why This Project Matters

SuoiHai Villa succeeds because its strategies are specific to place rather than borrowed from a global playbook. The laterite bricks come from the same soil type that defines the lake's geology. The grass roof echoes the meadow it sits in. The courtyard gardens import the region's lush planting into the plan rather than sealing the interior off from it. Every passive design decision, from the perforated north wall to the full-height south glazing, responds to the actual sun path and prevailing winds of Ba Vì, not to a generic tropical checklist. The house is legible as a product of this specific terrain.

In a broader sense, the project offers a counterargument to the idea that Vietnamese residential architecture must choose between vernacular nostalgia and imported modernism. APDI demonstrates that local materials and construction logic can produce a contemporary spatial experience without sentimentality. The villa does not imitate a traditional Vietnamese house; it learns from the same landscape that shaped those traditions. At a moment when "biophilic design" risks becoming a marketing buzzword, SuoiHai Villa is a useful reminder that the concept only means something when rooted in geology, climate, and culture rather than mood boards.

SuoiHai Villa by APDI Architects (Lead Architect: Nhâm Chí Kiên), with landscape design by Phong Landscape. Ba Vì, Hanoi, Vietnam. 40,000 m². Completed 2023. Photographs by Trieu Chien.

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