House in Koamicho by Suppose Design Office


Japanese architects Suppose Design Office have completed a house in Hiroshima, Japan, where residents move between rooms through covered courtyards. Update: this project is included in Dezeen Book of Ideas, which is on sale now for £12.

Called House in Koamicho, the two-storey residence is situated on a long narrow plot.

Two glazed spaces between rooms are planted with small trees and break up the succession of rooms, affording glimpses of the outside.

Bedrooms are located on the ground floor with kitchen, dining and living areas on the first floor.

Photographs are by Toshiyuki Yano.

More about Suppose Design Office on Dezeen:

House in Buzen (February 2010)
Lodge hair Salon (February 2010)
Karis cardboard boutique (February 2010)
Cloud at Designtide Tokyo (November 2009)
Nature Factory (August 2009)
House in Minamimachi (July 2009)
House in Matsuyama (July 2009)
House in Nagoya (July 2009)
House in Saijo (July 2009)
House in Jigozen (June 2009)
House in Sakuragawa (June 2009)
House in Kamakura (June 2009)

The information below is from Suppose Design Office:

House in Koamicho

When we normally feel "interior" or "exterior", what are the causes? And what are the causes of feeling "open" or "narrow"?

This is house designed with much thought to how, from those root causes, we define the conditions of a space.

In a long, narrow space, we constructed walls, and by laying out a space in which we experience many rooms, we turn "narrowness" into "openness.

"Further, taking rooms and gardens as equivalent, we created spaces that are like the exteriors, calling them "garden rooms".

By moving from room to another room, we can alternately experience interior and exterior, and they become the place where every rooms are connected to the exterior.

Here we have succeeded in realizing a space, which pass traditional definitions tomaterialized a new relationship between - interior and exterior.

Building site:Koamicho, Hiroshima, Japan
Design : Suppose design office
Principal use:personal house
Structure:ReinForced Concrete, 2 story


Site area:102.86㎡
Building area:62.80㎡
total floor area:121.97㎡
Design : 2008-09
Construction : 2009.07
Photographer : Toshiyuki Yano

Dezeen Book of Ideas out now!

Suppose Design Office is included in our book, Dezeen Book of Ideas. Buy it now for just £12.

Posted on Thursday February 18th 2010 at 10:55 am by . Copyright policy | Comments policy

  • sabino

    Soooooo cozy.

  • Cold, sterile and devoid of colour yet somehow beautifully elegant.

  • kapa13

    i wonder what was the intetion of making it so dark? The interiors don´t recieve any natural lighting….

  • bebo

    old islamic architecture in a modern simple way.

  • jeanpierre

    that’s so depressing
    where do I put my books, my keys, my glasses?
    don’t those people own any objects?

  • Archaj

    Clean. Pristine.
    Don’t they love to click in an un-lived space, before the inhabitants move in.
    Human presence will pollute the rooms.
    Tsk tsk.

  • What an amazing space – quite cold, yet calming at the same time. A great space by such talented architects.

    We’ve posted this blog on our twitterfeed.

    thanks for the great read!

    -the mydeco team

  • chris

    is suppose design office DEZEEN’S pandora’s box of the week? they’re churning out projects like a motherf-cker!

  • Some colour and green plants inside, PLEASSSSE!

  • hyperspace


    I think the opposite: This architecture is strong, simple, but not intimidating. It will get even better, when people use it.

  • idealist

    by what magic are those stringer-less treads supported? same goes for the landings! i assume some sort of welded moment connections to a steel frame inside the concrete walls? even so, that would be some spring at the interior ends.. like walking up a bunch of diving boards…

    still, i’d love it if our north american codes would allow stuff like that…

  • The openness design of this house looks really relaxing. I would imagine all my worries and stress in life would just float away and disperse to the heavens above if I live here.

  • martin

    me recuerda Cuando estuve en prisión, que buenos momentos ¡¡¡


    siple,elegant,smart…….(especially plants,interior)
    but very cold…

  • slater

    Hey Idealist, I’m with you on the code comment. I feel restricted here, maybe it’s time to pack up shop and move to asia or europe?

    As far as the project, I never cease to be inspired by Suppose’s projects. That is the type of practice that I aspire to be like some day, congrats!

  • anonymous

    wonder if all these japanese people live with bare essentials, all is see is a table, 3 shirts, 1 toy, 1 tree….whats up with all that? or the client hasn’t moved it yet? please help me understand this style of japansese living…..

  • Great design, the idea of sharing the space with the outside is what I would love to adapt to the area where I live. Once again great work!


    great :) all that suppose design stuff :)
    specially like that “we turn “narrowness” into “openness”” concept

    about that 3 shirts, 1 toy etc: that house is obviously not inhabitated yet or for just a few hours, but theres enough space and boards to live here

    only thing i dislike is the pretty rough entry situation, somehow all this japanese houses are so introverted…

  • julien

    What is it that make people like me (european) uncapable of keeping our houses clean and empty? All these Japanese houses seem to be so quiet, relaxing and easy to live. Why do we have to pack ours with useless cheap objects??? I thing people like me should really consider changing the way we live, not only the way we design architecture…

  • Suedehead

    For me, this is a little too cold and sterile. I like my home to be warm and inviting.

  • claude

    Hi Julien,
    you should see real Japanese houses – packed with stuff up to the ceiling. There’s a nice littel book called Tokyo Style, full of real life pics. By Kyoichi Tsuzuki, and not by Taschen!
    It’s definitely too sterile for me too. The cool/cold look might be nice in Japan, when it’s 30°degrees outside, and 26° at night.

  • robin

    How is this heated? What happens when it starts snowing?

    Love the simplicity, but something needs to be introduced to balance the stark, cold concrete. Unless the objective is to create a stark (not Phillipe), nihilist space.

    How practical is this house?

  • ealizza

    having covered courtyards makes it seem like an ”improved version” of tadao ando’s azuma house!! hahaha

  • Ana

    Los arquitectos japoneses siempre sorprendiendo con su forma unica de concebir y deleitar con sus espacios.
    Un placer para los sentidos.

  • Quique

    I am not an architect, but as structural eng I have noticed that the stairs do not comply with regulations, plus that cantilever using equal angles is way too long. Is that normal esthetics before safety?

  • openhousebcn

    im not too sure why people cant just accept the beauty of these things, firs the japanese live in different ways, the push ideas of living in the architecture, they have different rules and different ideas of beauty,
    there are different regulations of what you can and cant do.
    and all these photos are taken just after the building is finished, usually before the people actually live in them and fill them with their stuff….

    studio bowwow make wonderful spaces, usually for japanese intellectuals or creative types, who fill them full of books and things after…

    i wish to have the money to build like that here

  • Cada pertenencia va acorde a la personalidad de cada uno de nosotros, seguramente la persona que habita esa casa tenga algo de conservador, ordenado o minimista, en el exterior ese volumen parece estorbar. Saludos!