Wedge House Ntlo ea Bolulo by Kiyoshi Sugimoto

Wedge House Ntlo ea Bolulo by Kiyoshi Sugimoto is a highly esteemed winner of the very prestigious 2025 Moputso oa Boronse oa A' Design Award in Moralo wa Meaho, Dikaho le Dibopego Competition Category.

BoronseMeaho· 2025

Wedge House Ntlo ea Bolulo

by Kiyoshi Sugimoto

Client: Masato Ikuta

Moputso oa Boronse oa A' Design Award Winner in Meaho Category

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The Design

About Wedge House Ntlo ea Bolulo

Wedge House ke ntlo ea bolulo ea mekato e meraro e hahiloeng sebakeng se moqotetsane se nang le leralla le maoto a phahameng Toropong ea Ikeda, Japane. Sebopeho sa khrose-sekhene se kang wejii se beha lebato le leholohali ka holimo le le lenyenyane ka tlas'a mobu, e le hore ho se ke ha eba le matla a eketsehileng a hatelletsang lerako la khale la ts'ehetso. Mekato e 'meli e ka holimo e entsoe ka lehong 'me sebakeng se ka tlas'a mobu se entsoe ka konkriti e matlafalitsoeng ka tšepe. Marako a ka bochabela le ka bophirimela a felelitsoe ka lipata tsa tšepe tse koahetsoeng ka silevera tse tšehetsang lebato le hlahelletseng 'me tsa etsa foreime bakeng sa pono e ka boroa. Sebaka sa bolulo se lebatong la bobeli se bulehela terateng e nang le pono e pharaletseng.

The Recognition

About the Moputso oa Boronse oa A' Design Award

Wedge House Ntlo ea Bolulo ke mohapi oa Moputso oa Boronse oa A' Design Award, kananelo e hlomphehang haholo e fuoang meralo e ikhethang e tsejoang ka boqapi, bohlale ba ho qapa le bohlale. Bahapi ba Boronse ke lintho tse nang le bokhoni ka ho felletseng le boqapi bo hlollang tse tiisang boiphihlelo bo bongata, mohopolo le bokhoni ba ho iphumana ba baqapi ba tsona. Wedge House Ntlo ea Bolulo e lebelletsoe ho ba ntho e hlomphuoang haholo, e ratoang le e ratehang, e nang le boprofeshenale bo bonahalang le mehopolo e mecha. Moralo ona o hapileng Moputso oa Boronse oa A' Design Award o kenyelletsa mekhoa e metle ka ho fetesisa bonong, mahlaleng, moralong le theknolojing mme o hlahella ka ho tsepamisa maikutlo lintlheng tse nyenyane. Wedge House Ntlo ea Bolulo e kutloisisa litlhoko hantle, e ama litakatso, e hapa maikutlo mme e tsosa takatso ea ho tseba.

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