Delta House by Yoshiyasu Mizuno centres
around a triangular courtyard

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A sheltered outdoor cooking area commonly found in traditional Japanese farmhouses is reinterpreted to form the open-air centre of this family house in Kanagawa by Japanese architect Yoshiyasu Mizuno (+ slideshow).

Delta House by Mizuno Architectural design office
Photograph by Yoshiharu Hama

Yoshiyasu Mizuno conceived Delta House as a roughly triangular building where rooms on two storeys wrap around a central doma – the traditional name for this kind of open-air space.

Delta House by Mizuno Architectural design office

"We invested most of our efforts into enlarging the interior space of this small house and exploring the relationship between interior and exterior spaces," explained Mizuno.



"This resulted in creation of a doma, which creates the approach to the house combined together with a adjacent triangular atrium," he said.

Delta House by Mizuno Architectural design office

Located in the seaside neighbourhood of Tsujido, the house was constructed on a former agricultural site. The irregular shape of this plot made it impossible to create a rectilinear house.

Delta House by Mizuno Architectural design office

The ground level forms two edges of the triangle, while the floor above creates a complete loop, allowing it to provide the canopy that shelters the space below.

Delta House by Mizuno Architectural design office

The family's main living and dining areas are all located on the first floor. Here, the majority of windows face inwards to overlook the doma, also allowing residents to look across into different rooms.

Delta House by Mizuno Architectural design office

"Playing with the cross views from the opposite sides of the house, we managed to increases the sense of spaciousness experienced by residents," said Mizuno.

Delta House by Mizuno Architectural design office
Photography by Yoshiharu Hama

The ground floor houses a bedroom and a pair of extra rooms that could accommodate bedrooms or other uses – one is currently being used as a piano rehearsal room.

Delta House by Mizuno Architectural design office
Photograph by Yoshiharu Hama

"As with Japanese houses from previous periods, this house enables its occupants to freely adjust private and public areas depending on the occasion," added the architect.

Delta House by Mizuno Architectural design office

The house's outer walls are clad with corrugated metal, while all recessed external surfaces are covered with timber panelling, as a warmer alternative.

Delta House by Mizuno Architectural design office
Photograph by Yoshiharu Hama

This correlates with the interior finishes, which include pale wooden floors, and white-washed timber columns and ceiling beams.

Delta House by Mizuno Architectural design office

Photography is by Harunori Noda, apart from where otherwise indicated.


Key to floor plans:

1. doma
2. genkan (entrance)
3. bed room
4. room 2
5. room 3
6. closet
7. living
8. kitchen
9. laundry room
10. bathroom
11. pantry
12. atrium

Delta House by Mizuno Architectural design office
Ground floor plan – click for larger image
Delta House by Mizuno Architectural design office
First floor plan – click for larger image
Delta House by Mizuno Architectural design office
Cross section – click for larger image
Delta House by Mizuno Architectural design office
Long section – click for larger image
  • Jimmy

    I like it: the idea as well as the execution of it. The courtyard adds distance to the small house and this “distance” adds a sence of space.
    I also like the materials used and the overal look and feeling of the internal spaces…
    Good job!