TH+ House

In a network of narrow pedestrian alleys in Hanoi, Vietnam, one family expanded its home onto an adjoining plot just 2.5 metres wide. ODDO architects completed TH+ House in 2025 beside the family’s original TH House, built in 2021. The two buildings work together as a larger home while retaining different interior arrangements.

The narrow site and an existing shared load-bearing wall limited the options for the new structure. A red steel column rises from the ground floor to the fourth floor, with beams supporting the spaces around it. Concentrating the structure along this line leaves room for thinner walls and larger openings. The column remains exposed, marking its path through the house.

At ground level, the new kitchen connects with the dining room in the older house. Above, tea and reading areas sit among spaces for guests and family life. Openings between floors and narrow metal walkways maintain views through the interior, allowing people on different levels to remain aware of one another. Enclosed rooms provide places to withdraw from the shared spaces.

Rooflights and internal voids bring daylight into the depth of the building and provide routes for natural ventilation. Large windows open towards the alley, preserving contact with the neighbourhood. Trees grow beside the circulation spaces, and the upper terrace is enclosed by a curved steel trellis that supports climbing greenery.

Exposed concrete ceilings meet timber floors and fitted cabinetry. White metal walkways allow light to pass through their perforated surfaces, while the red steel structure remains visible against the pale walls. Curved openings cut into timber partitions frame views between rooms and across the voids, giving the compact interior different scales as the family moves through it.

Project Information

Firm: ODDO architects
Area: 96 m²
Completed: 2025
Type: Residential
Material: Concrete, Glass, Natural timber, Steel

Interior greenery beside the red steel column and timber floor — Credit: Hoang Le

Red steel column between timber benches and an open stair — Credit: Hoang Le

White metal walkway beside a timber wall with a curved opening — Credit: Hoang Le

Kitchen and dining room beneath timber slats and exposed concrete — Credit: Hoang Le

Narrow kitchen with timber cabinets and a red steel column — Credit: Hoang Le

Dining table beside the kitchen and curved concrete ceiling — Credit: Hoang Le

Red steel beam beneath timber slats beside a curved concrete slab — Credit: Hoang Le

Reading area beside the red column and tall windows — Credit: Hoang Le

Interior void connecting the kitchen and upper rooms — Credit: Hoang Le

Red steel column and beam beneath an exposed concrete ceiling — Credit: Hoang Le

Timber counter below a white metal walkway beside a tree — Credit: Hoang Le

Upper walkway beside timber doors and indoor greenery — Credit: Hoang Le

Small timber alcove with circular openings in the wall — Credit: Hoang Le

Timber cabinetry and a curved mirror beside the bathroom — Credit: Hoang Le

Roof terrace with greenery and a curved steel trellis — Credit: Hoang Le

Overhead view of the roof terrace and curved red trellis — Credit: Hoang Le

Aerial view of the narrow house and adjacent rooftops — Credit: Hoang Le

Site plan drawing with photographs of the surrounding alleys — Credit: ODDO architects

Ground floor plan drawing — Credit: ODDO architects

First floor plan drawing — Credit: ODDO architects

Second floor plan drawing — Credit: ODDO architects

Third floor plan drawing — Credit: ODDO architects

Fourth floor plan drawing — Credit: ODDO architects

Interior collage drawing combining photographs and activity sketches — Credit: ODDO architects

Perspective section drawing showing the red steel structure — Credit: ODDO architects

Concept drawing showing the house structure and stacked spaces — Credit: ODDO architects

Urban context drawing with photographs and neighbourhood sketches — Credit: ODDO architects

TH+ House

Project Information

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