sou fujimoto: house K maximizes space with soaring roof sou fujimoto: house K maximizes space with soaring roof
jul 09, 2013

sou fujimoto: house K maximizes space with soaring roof

sou fujimoto: ‘house K’ maximizes space with soaring roof in nishinomiya, japan
image © iwan baan




 sou fujimoto‘s ‘house k’ is a voluminous, crescent-shaped home in northeastern osaka’s dense urban fabric. the approach to an disproportionate L shaped site is one of a soaring, thickened ground plane. pressed against the neighbors’ homes on three sides and bordered by a grove of trees, the rectangular volume literally grows out of the ground with a gentle concave motion until it peaks at the eastern-most point. the canopy therefore becomes a striking visual object from the exterior while providing the family with much-needed exterior space in the form of a rooftop terrace. the habitable roof additionally confronts the ubiquitous concrete slabs with a composition of trees in faceted metal planters.




a voluminous curved roof characterizes the home
image © iwan baan




the tectonic mass additionally informs the interior spaces, stretching across a three-tiered floor plan before becoming a wall element towards the western end of the plot. a separated hanare room, used historically as an individual sitting room from the main structure, also balances the strong external presence of the inclined home. reclaiming the airiness and multitasking planes of japanese vernacular architecture was central to the project; an idea manifested in a stepped, open plan with a small promenade of stairs doubling as seating in between levels. a glazed entryway and anteroom leads to two flights of stairs direct circulation to an active middle storey that contains the kitchen and dining area. the only partitioned space is a lofted plane that differentiates the master bedroom, children’s bedroom and bathroom. the thickened roof curve is punctured by various apertures that allow interiors to be awash with natural light as well as the addition of a small ladder that grants access to the  outdoor hanare.



a stepped plan maximizes living spaces
image © iwan baan



site plan
image © sou fujimoto




floor plan level 1
image © sou fujimoto




floor plan level 2
image © sou fujimoto

  • Muy inseguro para los usuarios de la terraza

    Benjamin says:
  • let’s face it, wouldn’t it be better to have just a “regular” flat rooftop? that would be even a bigger plus in therms of usability. you’re free by using the platform as you want e.g. putting a table with chairs there and have a barbecue party with friends…

    of cours the interior wouldn’t be that spectacular, but let’s face it, the curved wall following the stair is a big space hog, and a pain in the ass while floor cleaning… Function follows form and not otherwise.

    Ehh?? says:
  • I’m feeling awfully uncomfortable about that roof with no side rail. I think it was Hammurabi’s code that required walls on roof tops. If an owner failed to do that and someone died they would be guilty of murder. It might have a negative effect on the look, but it would encourage its use.

    homesower says:
  • I think that it`s risk but it cut be so fun… wen i was little I used to climb a 7 meter tall statue and I never kill myself…. off course if somebody were really drunk it will be another story, but if you look better, the wall is inclined to, so if somebody falls they will roll and not crash on the floor…. so, it isn`t save but neither suicide.

    nowe says:
  • what scale is this?

    edison says:

have something to add? share your thoughts in our comments section below.

comments policy
designboom's comment policy guidelines
generally speaking, if we publish something, it's because we're genuinely interested in the subject. we hope you'll share this interest and if you know even more about it, please share! our goal in the discussion threads is to have good conversation and we prefer constructive opinions. we and our readers have fun with entertaining ones. designboom welcomes alerts about typos, incorrect names, and the like.
the correction is at the discretion of the post editor and may not happen immediately.

what if you disagree with what we or another commenter has to say?
let's hear it! but please understand that offensive, inappropriate, or just plain annoying comments may be deleted or shortened.

- please do not make racist, sexist, anti-semitic, homophobic or otherwise offensive comments.
- please don't personally insult the writers or your fellow commenters.
- please avoid using offensive words, replacing a few letters with asterisks is not a valid workaround.
- please don't include your website or e-mail address in your comments for the purpose of self-promotion.
- please respect jury verdicts and do not discuss offensively on the competition results
(there is only one fist prize, and designboom usually asks renown professionals to help us to promote talent.
in addition to the awarded designs, we do feel that almost all deserve our attention, that is why we publish
the best 100-200 entries too.)

a link is allowed in comments as long as they add value in the form of information, images, humor, etc. (links to the front page of your personal blog or website are not okay). unwelcome links (to commercial products or services of others, offensive material etc. ) will be redacted. and, ... yes, spam gets banned. no, we do not post fake comments.


a diverse digital database that acts as a valuable guide in gaining insight and information about a product directly from the manufacturer, and serves as a rich reference point in developing a project or scheme.

architecture news