This Indonesian House Turns Its Sloping Roof Into a Garden, a Staircase, & a Rooftop Pool

Some houses are designed to be looked at. Split Mass Residence, completed in 2026 by K-Thengono Design Studio, is designed to be moved through — a 712-square-metre home in BSD, South Tangerang, Indonesia, where every architectural decision is in service of movement, togetherness, and the slow pull of the outdoors.

Founder Kelvin Thengono built the project around a single, quietly radical idea: “The main design goal was to allow a seamless sequence of spaces that keeps the family connected, while also staying closely aligned with the surrounding landscape.” The house sits on a corner — what architects call a hook site condition — and rather than treat that exposure as a problem, the studio used it as the engine for the entire massing strategy. Volumes are split, pulled apart, and repositioned so that no single path through the house feels accidental.

Designer: K-Thengono Design Studio

That split is where the project gets interesting. Tiered, sloping garden roofs connect indoor living spaces directly to the planted outdoor setting, blurring the line between ceiling and garden in a way that feels more organic than architectural. From the open-plan kitchen, living, and dining area on the first floor, a glass door opens straight onto a grassy rooftop slope. An outdoor staircase continues upward to a swimming pool and barbecue area — the roof isn’t just a lid; it’s the social core of the house.

On the exterior, two materials do the heavy lifting. Concrete anchors the structure, giving it weight and presence on the streetscape. PE rattan panels wrap across the facade in woven screens that soften everything — filtering light, adding texture, and offering just enough visual privacy without closing the house off from its surroundings. The contrast is deliberate: one material says permanence, the other says warmth. Together they give the house a character that’s grounded and tactile rather than slick.

What Thengono has built here isn’t really a house in the traditional sense — it’s a system of encounters. Divided volumes, green roofs, and internal and external staircases create different scenarios for family interaction, so the architecture itself nudges people toward each other without ever forcing it. The rooftop garden crowning the whole composition reinforces that layered approach — landscape as architecture, architecture as landscape.

In a region where residential design often defaults to gated grandeur or tight minimalism, Split Mass Residence lands somewhere more considered. It’s a house that knows exactly where it wants you to be — and makes getting there feel like the whole point.

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KantorGG Just Built a Tropical Home That Faces the Wrong Way

Most tropical homes try to open up. Floor-to-ceiling glass, wraparound terraces, the constant push-pull between inside and outside air. It’s practically a formula at this point. So when a house comes along that deliberately turns away from that instinct, you stop and pay attention.

SE House, designed by Giovanni Gunawan of Surabaya-based studio KantorGG, sits at one of the city’s most recognizable residential corners and does something quietly radical: it pulls inward. Not to close off or shut the world out, but to create a kind of depth that most houses spend their entire floor plan actively avoiding.

Designer: Giovanni Gunawan for KantorGG (photos by Tristan Salim)

The concept is organized around a central courtyard, natural airflow, dry gardens, and the kind of deliberate voids that make space feel intentional rather than accidental. Gunawan placed dry gardens between the masses and the voids so residents experience the outdoors without sacrificing the comfort of being inside. It sounds simple enough. The execution is anything but. This is Gunawan’s stated interpretation of what tropical living can actually become, and I think he’s asking a question the design world has been skating past for years. We’ve gotten very good at making tropical homes look beautiful in photographs. We are considerably less practiced at making them feel like somewhere genuinely worth inhabiting on an ordinary Tuesday.

KantorGG’s design ethos centers on “living with nature, inside and out,” and SE House is probably the clearest expression of that philosophy yet. The existing mature trees on the site weren’t cleared to make room for clean lines. They were preserved as spatial anchors, the kind of decision that takes real confidence because it limits what you can do architecturally, and then rewards you generously in return. Shaded seating under dappled light, shifting reflections, the particular quality of sitting beneath something old and rooted. That’s not something you can manufacture after the fact.

The Australian-inflected sensibility woven through the design deserves a closer look. Gunawan studied abroad, and that cross-pollination shows up in SE House’s structure without being heavy-handed about it. The house doesn’t read as imported or imitated. It reads as absorbed and reissued through a sensibility that is distinctly Indonesian. That tension between influences, when handled well, produces architecture that belongs nowhere else and everywhere at once.

The 360-degree courtyard layout is worth sitting with on its own terms. It means the house has no single dominant view, no privileged front-row seat. Every room must negotiate with the central space, which keeps the architecture from becoming a spectacle and makes it a place to actually live inside. I find that rare, and more genuinely considered than most high-concept residential projects that pass through design media these days.

SE House has attracted the kind of attention that usually gravitates toward buildings with louder ambition. The buildings that announce themselves as you walk in. This one whispers, and that’s precisely why people are listening. Gunawan described it as a quiet manifesto for tropical living, and the word choice matters. A manifesto doesn’t have to be loud to carry weight.

The broader argument SE House seems to be making is that restraint isn’t the enemy of richness. The absence of visual noise isn’t emptiness. The voids aren’t what’s missing from the design. They are the design, or at least a fundamental part of what makes the rest of it land. That’s an architectural lesson, but it also translates well into how we think about design at every scale, from the objects we choose to live with to the spaces we build up around ourselves over time.

SE House is the kind of project that stays with you not because of one striking image but because of the underlying logic. It makes you want to look at your own spaces differently, and ask whether you’ve been opening up when you should have been pulling inward the whole time.

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The World’s Skinniest Hotel measures just 9.1 feet in width

Designed by Sahabat Selojene, the Piturooms in Indonesia is one of the skinniest hotels in the world! It only has a width of 280 cm, and is an ingenious solution to combating a challenging and complicated inner-city plot. It is nestled in Central Java on a narrow site that is stuffed between an alleyway, a neighboring garden, and surrounding homes. This little space had a lot of potential, and the hotel owners wanted to turn the lack of space into a highlight, converting it into a unique skinny hotel!

Designer: Sahabet Selojene

Piturooms has a height of 55 feet and a length of 31 feet. It features a well-designed interior that accommodates seven hotel rooms, an entrance lobby, a compact lounge, as well as a small outdoor terrace area close to the top of the building. A crisscrossing staircase functions as the focal point of the space, with all the hotel rooms placed around it. There is a tiny elevator as well which is intended for luggage and disabled access. The seven hotel rooms feature different color schemes and house a double bed, TV, and bathroom with shower, sink, and toilet.

“With a size of only 2.8 x 3 x 2.4 m [9.1 x 9.8 x 7.8 ft], each room has the ability to provide an intimate shell of a primitive sleeping nest while still addressing modern living with its compact yet fully equipped amenities in its interior,” said Sahabat Selojene. “The addition of various original artwork in each room introduces an even more personal touch and acts as a starting point for each different theme.

Selojene connected the various rooms, floating steps, and the narrow corridor with grating as flooring to build a unique transparent and see-through effect inside the entire building. This gives the space a larger and more expansive feel, providing it with a certain openness. The openness also allows air streams to be generated between the external walls and the opaque canopy on every floor.

The Piturooms makes for a unique and comfortable stay in the heart of Central Java. If you’re interested in staying, you can book a room for almost US$55  per night.

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