Humberto Conde Arquitectos Steps Four Black-Clad Houses down a Wooded Cascais Hillside

Four houses on one sloping plot is a familiar developer brief, and it usually goes wrong in a familiar way: the units line up shoulder to shoulder, the gardens overlook each other, and every family ends up staring into a neighbour's living room. In Abuxarda, in the Cascais parish of Alcabideche, Humberto Conde Arquitectos takes that brief and treats the hillside itself as the organising tool. The four units, completed in 2025 across roughly 1,200 m², are staggered down the slope so each one steps clear of the house above.

What interests us is how much work a single repeated house type can do. On paper this is one design copied four times. On site, the stepping, the dark upper volume cantilevered over a pale concrete base, and the glass balustrades produce a group that reads as a coherent terrace from a distance and as a private villa from inside any one garden. The project shows how far you can push privacy and views without resorting to walls, using section and offset alone.

Letting the Slope Do the Planning

The aerials make the strategy legible. Each house sits on its own shelf of the hillside, flat gravel roofs dropping one after another, with a narrow turquoise pool and a strip of lawn in front of every unit. Because each roof sits lower than the terrace behind it, the house above looks over its neighbour rather than into it.

The existing trees matter here too. Tall eucalyptus and pines stay in place around the edges, so the ensemble reads less as a new subdivision and more as four objects set into an already wooded slope. The gravel roofs, seen from the upper houses and the street, are a quiet choice that avoids turning the fifth elevation into a field of plant equipment.

Arriving from the High Side

From the street, you meet the houses at their most closed. The dark upper box hovers over concrete walls, and a grass-paved ramp drops toward the buried garage level while a stair runs beside a clipped hedge. It is a modest, almost defensive frontage, which is exactly right for a road-facing side.

Moving down through the site, the stone steps and timber retaining walls take over. Floating treads and glass guards keep the circulation light, so the descent between levels feels like walking a garden path rather than climbing a building's fire stair.

The Dark Box Over the Glass

The signature move is the upper volume: a black box wrapped in vertical slats, cantilevered past the glazed living floor beneath it. It does several jobs at once. It shades the ground-floor glass, gives the bedrooms a screened skin, and creates a deep overhang that turns the terrace below into a covered room.

The contrast between that dark mass and the concrete base also breaks down the scale of each house. Rather than a single three-storey block on a hillside, you read a heavy lid resting on a lighter plinth, which keeps the four units from feeling bulky despite their size.

Pools, Terraces and the Edge of the View

The green-tiled infinity pools are a smart deviation from the default turquoise rectangle. Against the pale stone terraces and the dark cladding, the tile reads almost as a continuation of the hedges and trees, so the water seems to belong to the garden rather than to a resort brochure.

Look at how the edges are handled. Glass balustrades replace opaque parapets wherever a drop occurs, and the slatted timber soffits above the terraces carry the language of the upper box down into the outdoor rooms. Each house gets its own sheltered terrace, pool and lawn, and the stepping keeps those spaces from being overlooked by the houses uphill.

Kitchens Built as Furniture

Inside, the plan is organised around dark, flush volumes that hold the kitchen and storage. The tall black cabinet wall reads as a single piece of joinery rather than a run of units, and it keeps appliances and clutter out of sight so the living space can open fully to the terrace through floor-to-ceiling sliding glass.

The floating black steel stair works the same way, as a sculptural element set against the cabinetry, not an enclosed core. The oak floors and the lit slatted corridor soften what could otherwise be a hard monochrome palette, and the lower-level kitchen opening onto a sunlit outdoor stair is a reminder that even the buried floor gets daylight on this section.

How the Houses Read After Dark

At dusk the massing inverts. The glazed ground floors glow, the edge lighting picks out the underside of the cantilever, and the dark boxes become heavier still, as if floating over a lantern. It is the moment when the section is easiest to understand from the garden.

The tall amber windows in the slatted facades, with a hedge running between neighbours, also show how carefully the side elevations are managed. Openings between houses are narrow and vertical; the generous glass is saved for the downhill view.

Plans and Drawings

The drawings confirm what the photographs suggest: one house type, repeated four times and shifted along the slope. The site plans show parking at the top, gardens and pools at mid level, and bedroom floors above, while the sections reveal the garage and service level buried into the hill beneath the glazed living floor.

The long elevations are the most persuasive sheets. Four identical boxes stepping up a steep gradient produce a rhythm that no single house could achieve, and the cross sections make clear how the cantilever and the terrace below are calibrated together.

Why This Project Matters

Small multi-unit developments on suburban slopes are everywhere around Lisbon and Cascais, and most of them squander their sites. This one shows that you can repeat a single unit, keep costs and coordination simple, and still give every household privacy, a pool, a garden and an unobstructed view. The tool is the section, not ornament or expensive variation.

We would like to know more about the build-up of the cladding and the environmental performance of all that glass, which public material leaves unstated. But as a lesson in siting, the scheme is clear and repeatable: stagger the units, bury the cars, put the heavy volume on top and let the hillside handle the rest.

Condominium 4 Houses in Cascais by Humberto Conde Arquitectos, Abuxarda, Alcabideche, Portugal. Area: 1,200 m². Completed 2025. Photography by João Morgado.

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