Wedge House Indawo Yokuhlala by Kiyoshi Sugimoto

Wedge House Indawo Yokuhlala by Kiyoshi Sugimoto is a highly esteemed winner of the very prestigious 2025 Umklomelo Webhulonzi we-A' Design Award in Ukudizayina Ezokwakha, Izakhiwo Nezinhlaka Competition Category.

IbhulonziEzokwakha· 2025

Wedge House Indawo Yokuhlala

by Kiyoshi Sugimoto

Client: Masato Ikuta

Umklomelo Webhulonzi we-A' Design Award Winner in Ezokwakha Category

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The Design

About Wedge House Indawo Yokuhlala

I-Wedge House indlu enezitezi ezintathu eyakhelwe endaweni encane enomthambeka olujulile eIkeda City, eJapane. Isakhiwo esifana nesiso ngokujikeleza sibeka phansi kwakho konke isitezi esikhulu kunazo zonke phezulu, kanti isitezi esincane kunazo zonke sibekwe ngaphansi komhlaba, ukuze kungabi khona amandla engeziwe afakwa odongeni olusekelayo oludala. Izitezi ezimbili eziphezulu zakhiwe ngezinkuni, kanti isitezi esingaphansi kwomhlaba sakhiwe ngesigxobo esiqinisiwe (reinforced concrete). Izindonga zasempumalanga nasentshonalanga zifakwe amaphaneli ensimbi ambozwe ngesiliva, asekela isitezi esikhomba phambili (cantilevered floor) futhi asungula umkhangiso obhekise umbono ngaseningizimu. Indawo yokuhlala esitezini sesibili ivuleka iye ku-terrace enombono obanzi.

The Recognition

About the Umklomelo Webhulonzi we-A' Design Award

Wedge House Indawo Yokuhlala iwinile uMklomelo Webhulonzi we-A' Design Award, ukwaziswa okuhloniphekile kakhulu okunikezwa imiklamo ephawulekayo eyehlukaniswa ukudala, ubuhlakani nobukhali bengqondo. Abawinile beBhulonzi yimisebenzi enobuchule obukhulu nedala ngokumangalisayo eqinisekisa isipiliyoni esibanzi, umcabango nobuhlakani babaklami babo. Wedge House Indawo Yokuhlala ilindeleke ukuba ibe yinto exatshwa kakhulu, edunyiswayo nethandwayo, enobungcweti obuphawulekayo nezinto ezintsha. Lo mklamo owinile uMklomelo Webhulonzi we-A' Design Award uhlanganisa izindlela ezinhle kakhulu ebuciko, esayensi, ekuklameni nasebuchwepheshe futhi uhamba phambili ngenxa yokunaka kwawo imininingwane. Wedge House Indawo Yokuhlala iyanelisa izidingo ngokumangalisayo, ithinta izifiso, iheha imizwa futhi ikhanga ukufuna ukwazi.

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties: The site has a nice view, but it is narrow and has a steep slope, and due to area regulations, the building coverage ratio is a strict 40%.
In order to meet the required area to comply with strict regulations, we adopted a three-story mixed structure with two floors above ground made of wood and one floor below ground made of reinforced concrete.
The building has a wedge-shaped shape, with the second floor, which has the best view, as the living space and the largest area, and the area decreases as you go to the lower floors to avoid applying force to the retaining wall.
Dimensions & Packaging: Total floor area 111.16㎡　Width 5560mm x Depth 11000mm x Height 10190mm
Tags: Slopingland structure protruding structure wedge Basement mountainside
Production Technology: The east and west walls are finished with silver galvalume steel plates, which support the cantilevered floor that protrudes from the basement, and at the same time serve to frame the view to the south.
The basement is a bedroom with a sense of security that feels like it's nestled on a slope. The first floor has a water area and a study with a view of the greenery of the park behind the deep eaves. From the sky terrace of the LDK on the 2nd floor, you can enjoy a panoramic view of the Osaka plains. This is a house where you can enjoy the three different slopes of Mt. Satsuki.
Design Challenge: Stable structural design with an underground shape that does not apply force to old retaining walls on a narrow, steeply sloped site, and a protruding structure for the wooden upper building.
Research: Research on stable structures with protruding shapes in wooden buildings
Inspiration: The site is located at the foot of Mt.Satsuki in Ikeda City, Osaka Prefecture, Japan. The site was narrow, and more than half of the site was on a steep slope.
Additionally, the site is located on an old, tall retaining wall, so the building had to be constructed in a way that would not put stress on the retaining wall.
Therefore, the building's cross-sectional shape is wedge-shaped, with the basement being the smallest and increasing as the floors rise.
Project Duration: Design for the project began in September 2022 at a site in Ikeda City, Osaka Prefecture, and was completed in June 2024.
Operation Flow: A basement with a shape that does not apply force to the old retaining wall, and a pop-out floor structure for the upper wooden building to maintain the required area.
Team Members: KIYOSHI SUGIMOTO
Image Credits: All photos and videos Hirofumi Imanishi