２種類の住戸の組み合わせでつくる４階建ての共同住宅。

すべての住戸をできるだけ同じ条件で揃えるのが共同住宅の定型だ。しかし今回の場合、そのような住戸は２・３階にしか確保できない状況だった。建物の側面に路地を設けなければならないため、１階は室内面積が小さくなり、採光制限で建築基準法上の居室が設けられない。４階は斜線制限でボリュームが削られるため外部階段を延ばすことができず、室内にもデッドスペースが多い。

したがって、１・４階ともシンプルで開放性の高いモノトーンの内装にしたうえで、１階は路地に面してSOHO利用ができるガランとした場所、４階は眺望と風通しが心地よい場所として特徴を持たせ、定型のワンルームである２・３階とセットにしてメゾネットを組むことにした。２・３階は茶色を基調とした落ち着いた雰囲気の内装としている。

各階が直面する周辺環境によって、住戸の向きを９０度変えて開放している。１階は前面道路に通行量が多いので側面に、２階と３階は脇の隣家が迫っているので前面に、４階は隣家の屋根越しに眺めが良いので側面に向けた。座標で言えばX・Y・Y・Xの関係で各階が積み上がっている。メゾネット内で階を移ると内装の印象だけでなく、空間の向きもがらりと変わる。

住宅密集地での共同住宅は、周辺環境の事情によって各住戸を同じ条件で揃えられないことが多い。ならば指向性の違う住戸をあえてつくり、その組み合わせによって階ごとの長短所を補いつつ、借り手が選べる楽しさと特徴を備えた共同住宅がつくれないかと考えた。

−中佐昭夫−


Name of the Project : XYYX Apartment (STELLA)
Location : Bunkyo ward, Tokyo
Category : Apartment
Zoning use district : -
Structure : Steel construction
Number of stories : 4 stories above ground
Maximum height : 11.370 m
Maximum eave height : 11.370 m
Frontal road : 8.75m on the west
Site area : 101.85m2
Building area : 77.99m2
Total floor area : 235.84m2
Design time :September 1, 2009 - September 30, 2010
Construction time : October 1, 2010 - August 31, 2011
Architect : Akio NAKASA(Principal Architect) , Tomohiro TANAKA
Photo : Toshiyuki YANO


4-story housing complex constructed with combination of two types of housing unit.

When designing a housing complex, it is a typical formula to put all the housing units under the same conditions as much as possible. However, in this project, this formula applied only to units on the second and third floor. A passage which needed to be paved on the side of the building reduced the floor area of units on the first floor and restriction of daylight made it impossible to make bedroom or living room. Diagonal limit on the fourth floor reduced the volume of the building, thus increased dead space, and made it impossible to extend exterior stairs.

Considering such conditions, units on the first and fourth floor with simple, open and monotone interior compose maisonette with units on the second and third floor with brown tone relaxing interior. Units on the first floor which face the street can be used as SOHO. Units on the second and third floor are studio type apartment. Units on the fourth floor are airy and have a good view.

The direction of the units are turned 90 degrees depending on the environment of each floor. Units on the first floor are open to the side to avoid frontal road with a lot of traffic. Units on the second and third floor are open to frontal road to avoid adjacent buildings. Units on the fourth floor are open to the side as view is open over the roof of adjacent buildings. The units on each floor are stacked in X・Y・Y・X direction in coordinate system. Each floor in the same maisonette gives different impressions in terms of interior and direction.

Housing complex in a dense residential area faces difficult conditions. Surrounding environment makes it difficult to give same conditions for all the units. We proposed a solution by making the most of the conditions of the each floor and supplementing the advantage of each by combination of different floors. This is a housing complex which gives the tenants the liberty to choose the extra feature to the ordinary apartment.

- Akio Nakasa -