Yoshinogawa Valley Renovering av huvudkontorsbyggnad av Wataru Sato

Designen Yoshinogawa Valley Renovering av huvudkontorsbyggnad av Wataru Sato är en högt ansedd vinnare av den mycket prestigefyllda 2026 A' Design Award i Brons i tävlingskategorin Arkitektur-, Byggnads- och Konstruktionsdesign.

BronsArkitektur· 2026

Yoshinogawa Valley Renovering av huvudkontorsbyggnad

av Wataru Sato

Klient: KITAOKA Group

Vinnare av A' Design Award i Brons i kategorin Arkitektur

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Färger

Designen

Om Yoshinogawa Valley Renovering av huvudkontorsbyggnad

Detta projekt är en renovering av en 40 år gammal prefabricerad kontorsbyggnad utan rivning. Ett 50 meter långt linjärt tomrum har infogats i mitten av den befintliga strukturen, i linje med Yoshinoflodens öst-västliga axel, vilket omorganiserar byggnaden i två flyglar i nord-sydlig riktning. Denna rumsliga operation, kallad Yoshino River Valley, utgör arkitekturens ryggrad. Ett norrvänt takfönster ger stabilt dagsljus, medan passiv ventilation skapas genom höjd- och tryckskillnader. Genom att omorganisera byggnaden undviker projektet att splittra de värden den bär upp.

Erkännandet

Om A' Design Award i Brons

Yoshinogawa Valley Renovering av huvudkontorsbyggnad är vinnare av A' Design Award i Brons, ett högst prestigefyllt erkännande som tilldelas enastående designverk som utmärker sig genom kreativitet, uppfinningsrikedom och klokhet. Bronsvinnare är mycket skickliga och slående kreativa föremål som styrker formgivarnas stora erfarenhet, fantasi och påhittighet. Yoshinogawa Valley Renovering av huvudkontorsbyggnad förväntas vara ett högt skattat, beundrat och älskat föremål som är anmärkningsvärt professionellt och innovativt. Detta vinnande verk i A' Design Award i Brons införlivar bästa praxis inom konst, vetenskap, design och teknik och är utmärkt genom sin omsorg om detaljer. Yoshinogawa Valley Renovering av huvudkontorsbyggnad tillfredsställer fantastiskt behov, rör vid längtan, charmar känslor och väcker nyfikenhet.

Bakom designen

Presskit

Erkännanden, teammedlemmar och tekniska detaljer tillhandahållna av designern.

Unika egenskaper: Inspired by the Yoshinogawa River, the design translates the structure of a valley into architecture. By dividing the existing building into two volumes and inserting a linear void, a valley-like interior is created.
A 50-meter skylight brings daylight inside, while the void enables ventilation, greenery, and social interaction. This configuration integrates environmental elements into the workplace.
Through renovation, the design reinterprets an existing office and proposes a new spatial model.
Dimensioner & förpackning: A valley-like void and continuous skylight are introduced at the center of a 50-meter prefabricated office building. The two-story void brings daylight to the ground floor and enhances natural ventilation.
A 7-meter Benjamin fig tree is placed at the center, visible from both levels. Planting along the void forms a layered green environment connected to the exterior.
Existing structure and finishes are retained, creating a composition where old and new materials coexist.
Taggar: Prefabricated office renovation, open lounge, atrium and skylight, regional architecture, nature-inspired workspace, Yoshino River
Produktionsteknik: The project renovates an existing prefabricated office building without demolition.
A central valley-like void integrates daylight, ventilation, and greenery. Continuous skylights provide stable north light, while passive ventilation is driven by height and pressure differences.
Spatial organization is redefined as an environmental system, reducing reliance on mechanical equipment. Existing structure and finishes are retained, forming a layered expression and a sustainable model for reuse.
Designutmaning: The primary challenge was to renew the environmental and social value of a deteriorated prefabricated office without demolition or new construction.
Introducing a skylight and central void into an enclosed structure required coordination of structural, safety, and cost constraints.
Rather than relying on equipment, the design redefines spatial organization as an environmental system.
The project shows that architectural operations can generate new value within existing buildings.
Forskning: This research examines how renovation can achieve environmental performance comparable to new construction.
A skylight and central void introduce daylight and passive ventilation, reducing reliance on mechanical systems.
Monitoring shows that artificial lighting is unnecessary during daytime and HVAC demand is reduced. Annual energy decreased by about 73,000 kWh, with savings of 65% in lighting and 30% in air conditioning.
The project presents a replicable model for sustainable renovation.
Inspiration: The project draws inspiration from the Yoshinogawa River, known as the Mother River of Tokushima.
Rather than referencing its form directly, the design interprets the river as a spatial structure.
By inserting a linear void through the existing building, the architecture transforms the logic of a valley into an interior condition, bringing light, wind, and greenery deep into the space, while also inviting relationships among people, families, and the local community.
Projektlängd: The project started in January 2023 in Miyoshi Town, Tokushima Prefecture, Japan, and was completed in August 2024.
Arbetsflöde: The building transforms a closed office into an open environment accessible to families and the local community.
The central valley acts as a social axis supporting movement, staying, and interaction. The ground floor serves as a shared space, while the upper floor provides flexible work areas.
Users are not assigned fixed workplaces but choose spaces as needed. Through everyday use, the project encourages informal encounters and redefines how work and social life coexist.
Bildkrediteringar: Image #1: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #2: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #3: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #4: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.
Image #5: Photographer Keita Yamamoto (Architectural Photography), Kitaoka Group Headquarters Renovation, 2024.