Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່ by Wataru Sato is a highly esteemed winner of the very prestigious 2026 A' Design Award ລະດັບທອງສຳລິດ in ການອອກແບບສະຖາປັດຕະຍະກຳ, ອາຄານ ແລະ ໂຄງສ້າງ Competition Category.
ທອງສຳລິດສະຖາປັດຕະຍະກຳ· 2026
Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່
by Wataru Sato
Client: KITAOKA Group
A' Design Award ລະດັບທອງສຳລິດ Winner in ສະຖາປັດຕະຍະກຳ Category
Verified Award Winner
Verify Award Status for #175868The Design
About Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່
ໂຄງການນີ້ແມ່ນການປັບປຸງອາຄານຫ້ອງການແບບປະກອບສຳເລັດຮູບອາຍຸ 40 ປີ ໂດຍບໍ່ມີການຮື້ຖອນ. ພື້ນທີ່ວ່າງເປັນເສັ້ນຊື່ຍາວ 50 ແມັດ ຖືກແຊກໃສ່ໃນໃຈກາງຂອງໂຄງສ້າງເດີມ ໂດຍວາງໃຫ້ຢູ່ໃນແນວດຽວກັບແກນຕາເວັນອອກ-ຕາເວັນຕົກຂອງແມ່ນ້ຳໂຢຊິໂນະ ເຊິ່ງຈັດຮຽງອາຄານຄືນໃໝ່ໃຫ້ເປັນສອງປີກເໜືອ-ໃຕ້. ການດຳເນີນງານທາງພື້ນທີ່ນີ້ ທີ່ມີຊື່ວ່າ ຮ່ອມພູແມ່ນ້ຳໂຢຊິໂນະ (Yoshino River Valley) ເປັນກະດູກສັນຫຼັງຂອງສະຖາປັດຕະຍະກຳ. ຊ່ອງແສງເທິງຫຼັງຄາທີ່ຫັນໄປທາງທິດເໜືອໃຫ້ແສງທຳມະຊາດທີ່ຄົງທີ່ ໃນຂະນະທີ່ການລະບາຍອາກາດແບບພາສຊີບ (passive) ເກີດຂຶ້ນຈາກຄວາມແຕກຕ່າງຂອງລະດັບຄວາມສູງແລະຄວາມດັນອາກາດ. ໂດຍການຈັດຮຽງອາຄານຄືນໃໝ່ ໂຄງການນີ້ຫຼີກລ່ຽງການແບ່ງແຍກຄຸນຄ່າຕ່າງໆທີ່ອາຄານຮອງຮັບ.
The Recognition
About the A' Design Award ລະດັບທອງສຳລິດ
Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່ ແມ່ນຜູ້ຊະນະ A' Design Award ລະດັບທອງສຳລິດ ເຊິ່ງເປັນການຍອມຮັບທີ່ມີກຽດສູງສຳລັບການອອກແບບທີ່ໂດດເດັ່ນ ເຊິ່ງມີລັກສະນະເດັ່ນດ້ວຍຄວາມຄິດສ້າງສັນ ຄວາມຫຼັກແຫຼມ ແລະ ຄວາມຄົມຄາຍ. ຜູ້ຊະນະລະດັບທອງສຳລິດແມ່ນຜົນງານທີ່ມີທັກສະພຽງພໍ ແລະ ສ້າງສັນຢ່າງໂດດເດັ່ນ ທີ່ຢືນຢັນປະສົບການອັນກວ້າງຂວາງ ຈິນຕະນາການ ແລະ ຄວາມສາມາດຂອງຜູ້ອອກແບບ. Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່ ຖືກຄາດວ່າຈະເປັນສິ່ງຂອງທີ່ໄດ້ຮັບການຍົກຍ້ອງສູງ ໜ້າຊົມເຊີຍ ແລະ ເປັນທີ່ຮັກແພງ ທີ່ເປັນມືອາຊີບ ແລະ ມີນະວັດຕະກຳຢ່າງໂດດເດັ່ນ. ການອອກແບບທີ່ຊະນະລະດັບທອງສຳລິດນີ້ນຳໃຊ້ວິທີປະຕິບັດທີ່ດີທີ່ສຸດໃນດ້ານສິລະປະ ວິທະຍາສາດ ການອອກແບບ ແລະ ເຕັກໂນໂລຊີ ແລະ ດີເລີດໃນການເອົາໃຈໃສ່ລາຍລະອຽດ. Yoshinogawa Valley ການປັບປຸງອາຄານສຳນັກງານໃຫຍ່ ຕອບສະໜອງຄວາມຕ້ອງການຢ່າງດີເລີດ ສຳຜັດຄວາມປາດຖະໜາ ດຶງດູດຄວາມຮູ້ສຶກ ແລະ ກະຕຸ້ນຄວາມຢາກຮູ້ຢາກເຫັນ.
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.
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