1+ House

1+ House
© Norihito Yamauchi

1+ HOUSE

SAI Architectural Design Office

LOCATION
Osaka, Japan

CATEGORY
Houses

AREA
112 m²

YEAR
2019

MANUFACTURERS
Nemetschek, Twinmotion

ENGINEERING
Ikesyo Corporation

STRUCTURAL DESIGN
Ippei Yasue

Text description provided by architect.

Even in houses, where functionalism is celebrated, it seems that each space has its own purpose: to sleep, to eat, to watch TV, to read a book. Is it possible to simply assign functions and assume them?

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

It is precisely because it is a house that we want to create an architecture that will be open to the many changes in our lives.

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

The horizontal roof extends to cover the whole house, inside and out. The windows, flooring, furniture and walls are designed to make it easy for visitors to come and go as they please.

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

The roof structure is a rectangular volume made of LVL transverse members and structural plywood, with a 2.2m cantilevered steel structure using lipped groove steel.

The facade is divided into upper and lower sections to create a blind fence, which allows the view of Mt.

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

The space is designed to be a place where people can sit, talk, study, store, lie down and enjoy the outside, crossing the large spatial scale that covers the whole space and the physical and furniture scale that accompanies human activity.

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

A space that allows for a variety of activities and a choice of places, creates a comfortable distance and time for each other, and leads to a richness of life even in the face of unpredictable changes.

1+ House
© Norihito Yamauchi
1+ House
© Norihito Yamauchi

Although it is a building that we use every day, its appearance five, ten or thirty years from now will change more than we can imagine.

When we visited the site, we were struck by the beauty of the flatland with its pleasant breezes and Mount Izumi Katsuragi in the background.

The maximum height of the floor, calculated from the slenderness ratio according to the specifications, ensures an air volume of 1.5 layers. The roof structure is made of LVL material, which is used for the roof structure.

1+ House
© Norihito Yamauchi


1+ House
Plan - First floor
1+ House
Plan - Second floor


1+ House
Section