Minimalist Japanese interior with round window, natural light, and a low table, reflecting Saisei’s blend of tradition and modern design.
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(DENTOU)
Tradition

About Us

Since inception, Saisei has taken on the challenge of designing spaces that not only stand the test of time but evolve with it—enriching the lives of those who experience them.

Building with Purpose

EST – 2022
Our Origins

Saisei (再生) was founded with a singular vision: to redefine architecture by harmonizing cutting-edge innovation with the principles of sustainability and tradition. Rooted in Tokyo, our story is one of rebirth—a commitment to building spaces that honor the environment while pushing the boundaries of what’s possible in modern design.

Inspired by Japan’s blend of cultural heritage and forward-thinking technology, our founding architect sought to challenge conventional practices. Saisei creates living spaces that breathe, adapt, and regenerate—offering both functionality and a lasting positive impact on urban landscapes.

Our Philosophy
  • Regeneration
  • Innovation
  • Sustainability

OUr Team

Takahiro Watanabe
Founder & Lead Architect
Yumi nakamura
Chief Sustainability Officer
Keiko Suzuki
Senior Design Consultant
Hiroshi Tanaka
Head of Project Management
Riku Yamamoto
Lead Structural Engineer
Aiko Fujimoto
Creative Director & Brand Strategist

What We Stand For

Our Philosophy

Saisei is more than an architecture firm—it’s a community united by shared values and a passion for sustainability. Our culture is rooted in continuous learning, creativity, and an unwavering respect for tradition.

Inspired by Japan’s blend of cultural heritage and forward-thinking technology, Saisei creates living spaces that breathe, adapt, and regenerate—offering both functionality and a lasting positive impact on urban landscapes.

(Watanabe Takahiro)
Key Values
  • Regeneration
  • Innovation
  • Sustainability

awards

Industry Recognition
1
World Architecture Festival
Sustainable Building – Completed Buildings
2021
2
Architizer A+
Best Firm – Architecture + Sustainability
2022
3
Green Good Design
Green Architecture
2022
4
Asia-Pacific Property
Best Residential Architecture – Japan
2022
5
Dezeen
Sustainable Building
2022
6
Japan Institute of Architects
Architectural Design Excellence
2022
7
MIPIM Asia
Best Green Development
2022
8
International Design Awards
Sustainable Living/Green Architecture
2022
9
Urban Land Institute - Asia Pacific
Excellence in Sustainability
2022
10
Global Future Design
Cultural Architecture
2022
(Chousensha)

We embrace the spirit of '挑戦者' (Chousensha), meaning "challenger." This philosophy drives us to approach every project with boldness and a commitment to pushing boundaries, ensuring we continuously innovate and evolve.

(setsu zoku)
connect

Craft Your Vision

Saisei blends innovation and sustainability to craft spaces that stand out and stand for something. Let’s bring your vision to life with thoughtful, modern design.

Get in touch

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