QBO3 Arquitectos Steps Two Tropical Beach Houses Down a Nosara Hillside Instead of Flattening It

Nosara has become shorthand for a certain kind of Costa Rican coastal living: surf in the morning, jungle at your back, an ocean view framed by palms. That popularity puts pressure on the hills behind the beach, where new houses often begin by cutting the slope flat. Kul-Nosara Residences, a pair of contemporary tropical beach houses by QBO3 Arquitectos under lead architect Mario Vargas, takes a different starting position. Completed in 2024 across roughly 1,300 m², the development treats the steep terrain as material to work with rather than a problem to erase.

What makes the project worth your attention is not its finish palette, which will look familiar to anyone who follows high-end tropical residential work. It is the section. The houses step, cantilever and terrace down the slope so that the hillside stays largely in place, and the architects let the resulting levels organize daily life: arrival at the top, living in the middle, pools pushed out to the edge where the canopy drops away toward the sea. We think that sectional discipline is the real design move here, and it is where we will focus.

Reading the Hillside from Above

The aerial views explain the project faster than any description. Volumes sit in tiers within a dense forest canopy, and the clearing around them is notably tight. A single curving drive threads between the two houses, following the contour instead of slicing across it. Where you expect a graded platform, you get a stack of terraces that read almost like retaining walls with rooms attached.

The two houses do not read identically from the air. One presents stacked flat roofs with timber louvers and an infinity pool cutting through the trees; the other shows pitched roof planes carrying solar panels. Whether that difference is a deliberate pairing or a response to each lot's particular slope, it keeps the development from feeling like a repeated product, which is a common failure in two-house schemes.

Arrival in Concrete and Stone

The heaviest materials sit where the house meets the hill. The carport is a concrete shell with dark stone walls and a round skylight that turns it into a small lantern at dusk. Board-formed concrete edges and textured stone walls appear at the junctions with the ground, and that hierarchy makes sense: mass where earth is being held back, lighter timber and glass as you move toward open air.

The planted roof edge under a timber slat pergola is a small detail with a clear intent. Broad-leaf plants spill over the built edge so that, seen from below or from the neighbouring house, the roofline softens into vegetation. It is a modest gesture, but it supports the claim that the architecture is meant to extend the landscape rather than sit on top of it.

The Pool as a Horizon Line

Pools in tropical villas are often treated as amenities dropped onto a deck. At Kul-Nosara they behave more like the final step of the section. The long infinity edges align with the canopy line, so the water appears to continue into the treetops and, further out, into the ocean. The geometry varies: one pool has a rounded edge under a covered terrace, while the top-down view reveals an angular, mosaic-tiled basin edged in stone and pressed against the wooded slope.

That angular plan is the more interesting of the two. It reads as a shape derived from the site rather than a rectangle imposed on it, and the stone coping ties the pool visually to the retaining walls behind.

Terraces That Carry Daily Life

In a climate like Nosara's, the terrace is where you actually live, and the houses are generous with it. Stone-paved walks run beside glass balustrades, timber decks hold wicker chairs among the trees, and a covered terrace with a slatted screen and a daybed offers shade without shutting out air. Stone steps lined with broadleaf planting make the transitions between levels feel like a garden path rather than a fire stair.

We would have liked more information on orientation and shading strategy, since the images suggest timber screens and deep overhangs are doing real climatic work. Even without that, the photographs show outdoor rooms that are designed with as much care as the interiors, which is the right priority for the setting.

Upper Volumes That Lean Out

The upper floors cantilever over the pool terraces, and this is where the sectional strategy pays off. By pushing the bedroom level outward, the architects create shade over the terrace below and gain views for the rooms above without excavating further into the slope. Black steel columns, slatted timber ceilings and glass balustrades keep the overhangs visually light.

Inside, the bedrooms and living areas open directly onto these edges. Woven armchairs, a stone coffee table and a jute rug sit just inside the glazing, so the threshold between interior and pool deck is barely registered. That effect only holds if the glass can open fully, and the images suggest it does.

A Staircase That Holds the Section Together

If the pool is the end of the section, the stair is its spine. A floating timber-tread staircase rises through a double-height living space, set against a travertine wall, with a pale sectional sofa below and the hillside or ocean visible through the glazing beyond. Because the houses are organized vertically, the stair is in view from nearly every part of the main level, and the architects have treated it as a piece of furniture rather than circulation to hide.

The double height also matters for the plan. It draws daylight down into the living area and lets the upper bedroom floor stay connected to the social level below, which is a useful counterweight to the stacking that the slope demands.

Kitchen and Table at the Center

The living, dining and kitchen zones form one continuous room facing the view. A long live-edge wood table runs parallel to floor-to-ceiling glass that opens onto the pool and the green slope, and the kitchen island sits under a slatted timber ceiling with sliding glass leading straight to the terrace. Seen from beneath the dark timber stair, the space reads as a single horizontal band slotted between the hill behind and the drop in front.

The palette of timber, stone and pale upholstery is restrained, perhaps to the point of being predictable. But restraint is defensible when the view is doing most of the work, and here the interior clearly defers to the landscape outside.

Plans and Drawings

The plans confirm the logic the photographs suggest. One lower level places a two-car garage and a bedroom alongside the open living and kitchen volume, with the terrace stepping toward the pool. The main living level drawing shows a curved retaining wall along the top edge, a clear sign of where the hill is being held, with the dining table, kitchen island and stair arranged in front of it and the pool terrace beyond.

The upper floors gather bedroom suites, each with its own bathroom, around a central stair and void. In one house, a skylit void sits at the center and a slatted louvre screen closes one end of the plan. Organizing private rooms around a shared vertical opening is a sensible way to keep light and air moving through a house that is backed into a hillside.

Why This Project Matters

Coastal Costa Rica is building quickly, and much of that growth is the kind of luxury villa that levels a ridge, pours a platform and installs a view. Kul-Nosara is still a luxury project, and it does not pretend otherwise. What sets it apart is a willingness to let the slope define the section, accepting retaining walls, cantilevers and split levels as the cost of leaving the hillside largely intact.

For architects working on steep tropical sites, the lesson is about sequence more than style. Put the mass where the ground needs holding, put the lightness where the view opens, and let the pool and terraces finish the section rather than decorate it. QBO3 Arquitectos have shown that this approach can produce houses that feel generous without demanding that the landscape give way first.

Kul-Nosara Residences by QBO3 Arquitectos (lead architect Mario Vargas), Nosara, Costa Rica. Area: 1,300 m². Completed: 2024. Photography: Alvaro Fonseca (Depth Lens) and Hugo Tirso Domínguez.

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