Yoshinogawa Valley Hoofkwartiergebou-opknapping by Wataru Sato

Yoshinogawa Valley Hoofkwartiergebou-opknapping by Wataru Sato is a highly esteemed winner of the very prestigious 2026 A' Design Award in Brons in Argitektuur-, Gebou- en Struktuurontwerp Competition Category.

BronsArgitektuur· 2026

Yoshinogawa Valley Hoofkwartiergebou-opknapping

by Wataru Sato

Client: KITAOKA Group

A' Design Award in Brons Winner in Argitektuur Category

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The Design

About Yoshinogawa Valley Hoofkwartiergebou-opknapping

Hierdie projek is 'n opknapping van 'n 40 jaar oue geprefabriseerde kantoorgebou sonder sloping. 'n Lineêre leemte van 50 meter word in die middel van die bestaande struktuur ingevoeg, in lyn met die oos-wes-as van die Yoshinorivier, wat die gebou in twee noord-suid-vleuels herorganiseer. Hierdie ruimtelike ingreep, genaamd Yoshinoriviervallei, vorm die ruggraat van die argitektuur. 'n Noordgerigte daklig verskaf stabiele daglig, terwyl passiewe ventilasie deur hoogte- en drukverskille gegenereer word. Deur die gebou te herorganiseer, vermy die projek die verdeling van die waardes wat dit ondersteun.

The Recognition

About the A' Design Award in Brons

Yoshinogawa Valley Hoofkwartiergebou-opknapping is 'n wenner van die A' Design Award in Brons, 'n hoogs prestigieuse erkenning wat toegeken word aan uitstaande ontwerpe wat gekenmerk word deur kreatiwiteit, vindingrykheid en skerpsinnigheid. Wenners in Brons is ruimskoots vaardige en opvallend kreatiewe artefakte wat die groot ervaring, verbeelding en vindingrykheid van hul ontwerpers bevestig. Daar word verwag dat Yoshinogawa Valley Hoofkwartiergebou-opknapping 'n hoog aangeskrewe, bewonderde en gekoesterde voorwerp is wat merkwaardig professioneel en innoverend is. Hierdie ontwerp wat die A' Design Award in Brons gewen het, inkorporeer die beste praktyke in kuns, wetenskap, ontwerp en tegnologie en is uitstekend vanweë sy aandag aan detail. Yoshinogawa Valley Hoofkwartiergebou-opknapping bevredig behoeftes pragtig, raak aan begeertes, bekoor gevoelens en spreek die nuuskierigheid aan.

Behind the Design

Press Kit

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

Unique Properties: 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.
Dimensions & Packaging: 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.
Tags: Prefabricated office renovation, open lounge, atrium and skylight, regional architecture, nature-inspired workspace, Yoshino River
Production Technology: 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.
Design Challenge: 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.
Research: 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.
Project Duration: The project started in January 2023 in Miyoshi Town, Tokushima Prefecture, Japan, and was completed in August 2024.
Operation Flow: 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.
Image Credits: 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.