TETRO Arquitetura Threads a Stepped House Through the Gaps Between Existing Trees in Lagoa Santa

Most houses on wooded lots start with a footprint and then negotiate with the trees. The Ascendente House, completed in 2025 by TETRO Arquitetura in Lagoa Santa, near Belo Horizonte in Minas Gerais, reverses that order. The architects began by mapping the voids between the existing trunks, then fitted 274 m² of program into those gaps. The trees are not a backdrop. They act more like structural columns that someone else placed first.

What makes the project worth your attention is how far that single constraint carries. The site's trees shaped the plan, and its fall shaped the section: the house steps down the slope in levels, separating social, private and service functions vertically rather than spreading them across the ground. The result is a long, slender building that reads as several stacked and offset volumes. A slatted timber skin then mediates between all of it and the forest. The name, Ascendente, is apt. This is a house organized by climbing.

A Footprint Drawn by the Forest

Seen from the garden, the house never fully appears. You catch it in slices between trunks: a white volume here, a run of louvers and glass there, a pale ramp curving across the ground. That fragmentation is the direct consequence of the siting strategy. When the plan follows the spaces between trees, the elevation inherits their rhythm.

We think this is the right way to build on a wooded suburban lot, and it is rarer than it should be. Clearing is cheaper and simpler. Preservation forces the architect to accept irregular geometry, tighter clearances and a building that cannot be photographed whole. TETRO accepted all three, and the house is better for it.

Cantilevers That Leave the Ground to the Garden

The white concrete upper volume angles away from the lower floors and cantilevers over the covered terrace. One slender round column picks up the overhang, and the soffit floats above gravel paths and stepping stones. Lifting mass off the ground does two jobs. It reduces how much soil and root zone the building occupies, and it creates shaded outdoor rooms where daily life can spill out of the interior.

The angled box also matters compositionally. Its rotation breaks the orthogonal stack below and points the upper level toward a different gap in the canopy. The geometry is less a formal gesture than a sightline being pulled into shape.

Stone, Glass and Water at the Social Level

The main entry sits at ground level, where the living room and kitchen form a single integrated space that anchors circulation and everyday use. Here the house is at its most open: a glazed pavilion set against a stacked stone wall, with a timber stair rising among large-leaved planting. The pool extends the social floor outward and reflects both the glass and the stone-clad volume above, so the building doubles itself in the water.

Two guest suites share this level but are reached from a covered veranda rather than the interior. That semi-open route gives guests independence without a separate building, and it means that moving through the house regularly takes you outside. For a project that insists nature is part of the architecture, this is the most convincing piece of evidence. The plan makes you walk through the garden.

The Screen as Climate Device and Light Instrument

Inside, the slatted screen earns its place. Low afternoon sun throws diagonal stripes across the concrete stair and glazed corridor, and the trees outside read as filtered green rather than a hard view. The openings face the interior of the lot, so privacy comes from orientation and the screen softens what remains. Built-in elements, such as a concrete bench over timber cabinets, keep the material palette short and let the light do the decorating.

The layout is also designed for cross-ventilation, which suits the climate of Minas Gerais. A slender plan, openings on opposite sides and a permeable outer layer: these are not new ideas, but they are applied here with discipline, and the environmental strategy and the spatial one turn out to be the same thing.

Plans and Drawings

The plans confirm the vertical zoning. The basement holds utilities, storage and a two-car garage beside the pool footprint. The first floor gathers suites, open circulation, the gourmet area, kitchen, living room, deck and pool, all arranged around the plotted trees. The second floor narrows to a single suite and a roof terrace on an irregular, trapezoidal site.

Section AA shows stacked floors and glazed walls stepping down the slope, while Section BB reveals the long inclined volume with its internal stair tracking the terrain. Read together, they explain the name: the house is a sequence of landings rather than a set of floors.

The elevations show how the volumes are assembled: a glazed horizontal band, a sloping ramp-like element, a screen-clad volume rising diagonally, and a brick base with slender piers anchoring the stack to the steep ground. On every side, the tall trees in the drawings sit taller than the house.

Why This Project Matters

Lagoa Santa, like many towns ringing Brazilian capitals, is absorbing residential growth onto wooded land. The default response is to clear the lot and build a box. Ascendente House shows a credible alternative at a modest scale: treat the existing trees as fixed coordinates, use the slope to separate program vertically, and let a screen handle privacy and sun so the plan can stay open.

The lesson is about sequence. TETRO's decisions are not unusual individually, since cantilevers, louvers and cross-ventilation are familiar tools. What sets the project apart is that the site was read before anything was drawn, and every later move follows from that reading. For architects working on sensitive suburban plots, that is the transferable idea.

Ascendente House by TETRO Arquitetura (lead architects Carlos Maia, Débora Mendes and Igor Macedo), Lagoa Santa, Brazil. Area: 274 m². Completed: 2025. Photography: Luisa Lage.

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