Wedge House Wunnsëtz by Kiyoshi Sugimoto

Wedge House Wunnsëtz by Kiyoshi Sugimoto is a highly esteemed winner of the very prestigious 2025 A' Design Award an Bronze in Architektur, Gebai an Strukturdesign Competition Category.

BronzeArchitektur· 2025

Wedge House Wunnsëtz

by Kiyoshi Sugimoto

Client: Masato Ikuta

A' Design Award an Bronze Winner in Architektur Category

12,587

Verified Award Winner

Verify Award Status for #162815

Visit Site View at A' Design Award Press Release Award Badge

Colors

The Design

About Wedge House Wunnsëtz

D'Wedge House ass eng dräistäckeg Wunneng, déi op engem schmuele Grondstéck mat enger steiler Hangluecht an der Stad Ikeda a Japan gebaut ass. De keilfërmegen Duerschnëtt setzt d'gréisst Stack uewen an d'klengst ënnert der Äerd, sou datt keng zousätzlech Kraaft op eng al Stëtzmauer ausgeübt gëtt. Déi zwou ieweschte Stäck si mat Holz gebaut, an de Keller besteet aus Stolbeton. D'Ost- an d'Westmaueren si mat versëlwerte Stolplacke verkleet, déi de auskrackende Buedem stëtzen an de Bléck no Süden aframen. De Wunnberäich am zweeten Stack mécht sech op eng Terrass mat engem breede Bléck op.

The Recognition

About the A' Design Award an Bronze

Wedge House Wunnsëtz ass e Gewënner vum A' Design Award an Bronze, enger héich prestigiéiser Unerkennung, déi un erausragend Designe vergi gëtt, déi sech duerch Kreativitéit, Erfindungsgab a Schlauheet ausgezeechnen. Bronze-Gewënner si voll Fäegkeet a opfälleg kreativ Wierker, déi déi grouss Erfahrung, d'Fantasie an d'Ressourceréichtum vun hire Designer bestätegen. Et gëtt erwaart, datt Wedge House Wunnsëtz e héich geschätzt, bewonnert a beléifte Géigestand ass, bemierkenswäert professionell an innovativ. Dëst mam Bronze ausgezeechent Design integréiert déi beschte Praktike vun der Konscht, der Wëssenschaft, vum Design an der Technologie an zeechent sech duerch Opmierksamkeet fir Detailer aus. Wedge House Wunnsëtz erfëllt Bedierfnesser exzellent, beréiert Wënsch, bezauberet Gefiller an erweckt Neigierecht.

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