Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali by Wataru Sato

Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali by Wataru Sato is a highly esteemed winner of the very prestigious 2026 Premju A' Design Award tal-Bronż in Disinn tal-Arkitettura, Bini u Strutturi Competition Category.

BronżArkitettura· 2026

Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali

by Wataru Sato

Client: KITAOKA Group

Premju A' Design Award tal-Bronż Winner in Arkitettura Category

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The Design

About Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali

Dan il-proġett huwa rinnovazzjoni ta' bini ta' uffiċċji prefabbrikat li għandu 40 sena, mingħajr twaqqigħ. Vojt lineari ta' 50 metru huwa mdaħħal fiċ-ċentru tal-istruttura eżistenti, allinjat mal-assi lvant-punent tax-Xmara Yoshino, li jorganizza mill-ġdid il-bini f'żewġ ġwienaħ tramuntana-nofsinhar. Imsemmija Yoshino River Valley, din l-operazzjoni spazjali tifforma s-sinsla tal-arkitettura. Skylight orjentat lejn it-tramuntana jipprovdi dawl naturali stabbli, filwaqt li ventilazzjoni passiva tiġi ġġenerata permezz ta' differenzi fl-għoli u fil-pressjoni. Bl-organizzazzjoni mill-ġdid tal-bini, il-proġett jevita li jaqsam il-valuri li jsostni.

The Recognition

About the Premju A' Design Award tal-Bronż

Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali huwa rebbieħ tal-Premju A' Design Award tal-Bronż, rikonoxximent prestiġjuż ħafna mogħti lil disinji eċċellenti ddistingwuti mill-kreattività, l-ingenwità u l-għaqal. Ir-rebbieħa tal-Bronż huma xogħlijiet bi ħila biżżejjed u kreattivi b'mod impressjonanti li jawtentikaw l-esperjenza vasta, l-immaġinazzjoni u l-ħila ta' riżorsi tad-disinjaturi tagħhom. Huwa mistenni li Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali ikun oġġett imqabbar ħafna, mammirat u maħbub, notevolment professjonali u innovattiv. Dan id-disinn rebbieħ tal-Bronż jinkorporaw l-aħjar prattiki fl-arti, ix-xjenza, id-disinn u t-teknoloġija u huwa eċċellenti fl-attenzjoni għad-dettalji. Yoshinogawa Valley Rinnovazzjoni tal-Bini tal-Kwartieri Ġenerali jissodisfa l-ħtiġijiet b'mod eċċellenti, imiss ix-xewqat, jinċanta s-sentimenti u jattira l-kurżità.

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.