House with a Nested Room

物件名  House with a Nested Room
所在地 神奈川県横須賀市
主要用途 一戸建ての住宅
発注者 個人
用途地域 第1種中高層住居専用地域
構造 木造
階数 地上2階
最高高さ 7.700m
最高軒高 6.400m
前面道路 南側4.000m
敷地面積 70.840m2
建築面積 42.210m2
延床面積 76.740m2
設計期間 2013年6月15日〜2014年12月8日
工事期間 2014年12月9日〜2015年11月9日
担当 中佐昭夫、天野徹平
構造設計 堀江聡/堀江建築設計事務所
施工 日本住研
掲載 『Contemporary Japanese Houses』 2018/7月出版 Images Publishing
『日経アーキテクチュア』 2017/12/14号 日経BP社
写真 矢野紀行


改装前の既存建物は72.04㎡のコンパクトな一戸建てで、そこに夫婦と子供2人と祖母の3世代が住んでいた。離れをつくる発想のきっかけは「祖母の居場所をきちんと確保したい」という夫婦の要望だったが、将来的に家族全員にとってどうすれば使い勝手が良くなるかを加味して考えた。その結果、祖母の居場所としてだけでなく、夫妻の主寝室・客間・思春期の子供部屋にも使えるような独立した個室(Nested Room)を、ひとつだけ明確に設定することにした。





Name of the Project : House with a Nested Room
Location : Yokosuka City, Kanagawa
Category : detached house
Zoning use district : –
Structure : Wood construction
Number of stories : 2 stories above ground
Maximum height : 7.700m
Maximum eave height : 6.400m
Frontal road : 4.00m on the south
Site area : 70.84m2
Building area : 42.21m2
Total floor area : 76.74m2
Design time : June 15, 2013 – December 8, 2014
Construction time : December 9, 2014 – November 9, 2015
Architect : Akio NAKASA(Principal Architect) , Teppei AMANO
Photo : Toshiyuki YANO

House renovation project which added a “Nested Room”, a big volume of eaves/ balcony and quasi-annex underneath, in the existing house.

The existing house was a compact detached house of 72.04㎡ of total floor area whose residents were a couple, two children and their grandmother, 3 generations, The idea of adding “annex” within the house was conceived from a request of the couple to “make a room dedicated to grandmother”. Considering the future usage of the “annex” to benefit the entire family, independent “Nested Room” was designed to serve not only as a room for grandmother but also as a main bedroom for couple, a guest room, or kids’ room at their puberty.

In order to increase the independence of the room, void/ wellhole was allocated around the room, connecting the room with stairs and bridge. 4.7㎡, maximum floor area that can be added to the building, was added to the second floor to extend as balcony to protrude from the existing building.

Up the stairs is the roof of large volume of eaves covering Nested Room, a sunny open floor with a view which continues to the balcony. Above the open floor is spacious room with bare ceiling showing wooden framework filled with light and wind to be carried through the house via void. Other than the independent room, the house consists of unified continuous space where glances and air are exchanged.

Usually an annex is built as a separate building, but in this project, it is included within the main building. Although they are integrated physically, by placing a bit of distance at the border of annex, we aimed to create a main/ annex relation psychologically. There are many compact detached houses for nuclear family already in place, but most of them only take in consideration the usage for family members at the time of construction. This is a project aimed at making a long term use of an existing house while the composition of the family and surrounding environment change in course of time.

– Akio Nakasa –

既存の木軸フレーム/existing wooden frame
既存の木軸フレーム/existing wooden frame