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Kiyoshi Sugimoto's Wedge House Residence presents an architectural composition of remarkable geometric clarity and material sophistication, where crisp white rendered volumes assert themselves against
Kiyoshi Sugimoto's Wedge House Residence manifests a compelling dialogue between geometric assertiveness and environmental integration, presenting a three-story dwelling that employs a distinctive wed
Kiyoshi Sugimoto's Wedge House Residence emerges from a sloped terrain through a composition structured by dramatic diagonal vectors and orthogonal planar intersections, revealing an architectural inv
Kiyoshi Sugimoto's Wedge House Residence manifests a masterful interplay between diffused natural illumination and refined spatial geometry, where floor-to-ceiling glazing spanning the entire width of
Kiyoshi Sugimoto's Wedge House Residence orchestrates a luminous integration of interior and exterior realms through floor-to-ceiling glazing that dissolves conventional boundaries between domestic sh

Masato Ikuta

Bronze Architecture, Building and Structure Design · 2025

Wedge House Residence

by Kiyoshi Sugimoto

  • A' Design Award 2025 Bronze Winner in Architecture, Building and Structure Design
  • Awarded April 15, 2025
  • CLIENT: Masato Ikuta
  • Estimated Number of Design Views: 12,454
  • Verification code AF0303626D · Verify this award
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About Wedge House Residence

Wedge House is a three-story residence built on a narrow site with a steep slope in Ikeda City, Japan. The wedge-shaped cross section places the largest floor at the top and the smallest floor below ground, so that no added force is applied to an old retaining wall. The two upper floors are made of wood and the basement is made of reinforced concrete. The east and west walls are finished with silver coated steel plates that support the cantilevered floor and frame the view to the south. The living area on the second floor opens to a terrace with a wide view.

Kiyoshi Sugimoto's Residence emerges within contemporary architectural discourse that privileges geometric clarity, material restraint, and the poetic potential of structural expression, positioning this dwelling within lineages of modernist spatial thinking while engaging distinctly with dense residential contexts requiring volumetric ingenuity, the design demonstrates sophisticated compositional intelligence through its tripartite vertical organization and dramatic horizontal cantilever, a formal gesture that achieves multiple spatial and experiential objectives simultaneously: the projecting upper volume creates sheltered outdoor space at the middle level, establishes visual drama through its hovering presence, and articulates structural capability as expressive element rather than concealed necessity, this architectural move resonates with metabolist explorations of expressive structure and modular growth systems while maintaining the refined material palette and surface quietude associated with minimalist sensibilities, the chromatic restraint to near-monochromatic white punctuated by charcoal metal demonstrates disciplined editing that allows form, proportion, and spatial relationship to communicate without chromatic competition, the strategic deployment of transparency at the middle register represents perhaps the design's most significant formal achievement, dissolving the building envelope at the zone of primary occupation to establish visual continuity between interior domestic space and exterior landscape while the opaque base and upper levels provide privacy and enclosure where needed, this layered approach to transparency and opacity, revelation and concealment, creates nuanced spatial reading that rewards continued observation, the material vocabulary speaks through contrasts: the smooth rendered surfaces suggest calm permanence and traditional enclosure; the corrugated metal introduces directional rhythm and contemporary industrial character; the extensive glazing offers dematerialization and connection; the visible natural wood ceiling elements introduce organic warmth tempering the predominantly inorganic palette, these material choices appear selected not merely for functional performance but for their semiotic contributions to the building's architectural narrative about domesticity, craft, and landscape integration, the cantilevered gesture itself carries significant technical accomplishment, requiring careful structural resolution to achieve the apparent effortlessness of its projection, the lack of visible support emphasizes lightness and precision while the dark cladding differentiates this element as special, calling attention to its structural audacity, the building's siting on sloping terrain with substantial retaining wall infrastructure suggests thoughtful response to challenging topographic conditions, transforming potential constraint into design opportunity by elevating the primary living spaces to capture views and daylight while anchoring the composition through its concrete base, the preservation and framing of mature vegetation indicates sensitivity to existing site ecology and recognition of landscape as essential architectural partner rather than mere backdrop, trees appear positioned to provide natural privacy screening, seasonal variation, and organic counterpoint to orthogonal built form, creating dialogue between natural growth patterns and geometric architectural order, the visible neighboring structure at left suggests the design operates within dense residential fabric requiring careful consideration of privacy, prospect, and contextual appropriateness, the architectural response balances assertive formal expression with contextual restraint, achieving distinctiveness without aggressive visual dominance, formal analysis reveals a composition energized by diagonal movement from lower foreground toward elevated rear yet stabilized through strong horizontal and vertical ordering elements, this dynamic equilibrium between movement and repose, lightness and mass, transparency and opacity generates visual interest sustaining contemplation, the fenestration rhythm varies across the three levels responding to different programmatic needs: minimal vertical slots suggesting service or circulation spaces at base, expansive openness at main living level, controlled horizontal band at private upper level, this hierarchical articulation makes the building's internal organization legible externally while creating varied facade rhythm, one observes how the design negotiates between universal modernist principles of spatial flow, structural expression, and material honesty and particular site-specific responses to topography, climate, neighboring structures, and landscape character, this synthesis of general principles and specific conditions generates architectural specificity that transcends generic application of stylistic formulas, the work invites consideration of how contemporary residential architecture might achieve both formal rigor and domestic warmth, structural expression and spatial intimacy, bold gesture and contextual sensitivity, suggesting that these apparent oppositions might be productively synthesized rather than mutually exclusive, how does architecture communicate shelter and exposure simultaneously, creating spaces of prospect and refuge within single integrated formal gesture?

Press Kit

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.
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.
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.
Image Credits
All photos and videos Hirofumi Imanishi
Patents
Copyright 2024 Kiyoshi Sugimoto.

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