Full support, schematic design to supervision
We take responsibility not only for design but for supervision during construction. From schematic and detailed design to on-site supervision, we safeguard building quality with a seamless setup.
建築設備設計・意匠設計の アッシュデザイン総合一級建築設計事務所｜電気設備設計・機械設備設計・施工図まで一貫対応
The Strongest Architectural Design Office.
Architectural, electrical & mechanical design, and shop drawings — all in one place.
About Us
We are H-design
H-design is a team of specialists across architectural, electrical, mechanical and shop-drawing design. Whatever the building, we bring it to life as one team — from the first sketch to the final drawing.
Trust us with all
of your architectural design.
A reliable team of pros.
A first-class architectural design office that handles everything in one place — from architectural, electrical and mechanical design to shop drawings, energy calculations and applications. With solid skills and honest work, we bring your plans to life.
5fieldsOne-stop design
47prefecturesFully remote, nationwide
Team of50+Team-H + support team
Why Ash Design
Aspirations first,
Aspirations first,
ideals into reality.
We always put your aspirations first and turn ideals into reality. From architectural design to electrical and mechanical design, shop drawings and construction supervision — we walk with you from a plan’s beginning to its completion, with solid skills and sincere service.
Private & public sectors, nationwide
From private companies to public institutions, we serve a wide range of clients — flexibly, anywhere in Japan, regardless of a project’s scale or use.
Client-first, making ideals real
We put client needs first and tailor proposals to each person. Through ongoing dialogue, we pursue design that gives shape to your aspirations just as they are.
Services
From architecture to electrical & mechanical, to shop drawings.
Architectural Design
Architectural Design
From homes to shops, offices and facilities. We design architecture that balances function and beauty to match each use and request.
Electrical Engineering
Electrical Design
Substations, feeders, power, lighting/outlets, disaster prevention and communications — we design a building’s electrical systems in full, from high to low voltage.
Mechanical Engineering
Mechanical Design
HVAC, ventilation, plumbing & sanitation, fire protection. We design the mechanical systems that keep interiors comfortable and energy-efficient.
Construction Drawings
Shop Drawings & BIM
We create shop drawings and other drawings that faithfully bridge design intent to the site. BIM/CAD supported.
Energy & Application
Energy Calc. & Applications
From energy calculations such as BEI (primary energy consumption) to preparing documents for building-confirmation applications.
Our Promise
Three promises.
One-StopOne-stop, end to end
From architecture to electrical & mechanical and shop drawings. One team handles, start to finish, phases that are usually split apart. With a single point of contact, nothing gets lost in handoffs and no one passes the buck — your vision takes shape without being watered down.
Give FirstSincerity and a giving spirit
We begin by giving. Rather than chasing short-term gain, we draw with your next ten years in mind — the promised quality, by the promised date. We believe that steadily doing the obvious, obviously, is architecture by the name of trust.
SpecialistsA cross-disciplinary team of specialists
Architectural, electrical and mechanical design — because specialists in each are on our team, we reach optimal solutions that span fields. A flexible team that welcomes side work and remote work brings diverse perspectives to your project.
Our Studio
A design office that even builds its own apps.
Beyond architectural design, Ash Design builds its own in-house apps to streamline work and enrich the workplace — from a virtual office to project management and shared memories. We turn our “power to create” toward how we work, too.
Soundtrack
A design office that
A design office that
designs sound, too.
Ash Design produces and releases music, not just architecture. Designing with notes instead of drawings, and time instead of space — please enjoy the “architecture of music” that only a design office would make.
Single — H-design
「心の建築設計」
“If only we could design the heart, the way we design a house—”
Listen
Preview · 30 sec
- 01 心の建築設計 0:30
A song by H-design, a first-class architectural design office. Guided by four “H”s — sincerity, care, family and happiness — we have designed not just buildings but people’s rich lives; here we paint that in sound rather than drawings.
Architecture means supporting the human heart through space — we deliver that wish as a single piece of “musical architecture.”
1st Album — Tako Beach
蛸BEACH『The Octopus』
From the margins of a blueprint, a band began.
Listen
Preview · 30 sec each
- 01 藍に溶けて 0:30
- 02 Replica's Heart 0:30
- 03 夜光虫 0:30
- 04 ∞シグナル 0:30
- 05 タコビート 0:30
- 06 抜け殻 0:30
- 07 蜃気楼 0:30
- 08 彼岸花 0:30
- 09 夕凪 0:30
- 10 心の建築設計 (タコタコ Remix) 0:30
Tako Beach, a band born inside Ash Design, presents its long-awaited first album “The Octopus.” Nine tracks plus a bonus track — the record of a formless creature that chose to sing anyway.
Like an octopus that has no bones, changes color, and sometimes mimics something else — nine stories that drift between “who am I?” and “the line between copy and real,” yet still choose to raise their voice.
Our Mission
We design happiness.
Happy Design
Journal
Ash Blog
Our editorial team is busy writing helpful articles on architecture.
Here are four fresh posts.
Team-H
Meet the team.
Meet Team-H, the characterful original cast that supports H-design’s work. Individual profiles and little “secrets” await in the character guide.
Index
Guide & Index
Our work, and our team. Step through whichever door catches your eye.
01
Service
Services
From architectural, electrical and mechanical design to shop drawings/BIM and energy calculations (BEI). One-stop, end-to-end handling of new builds and renovations for homes, shops, offices and facilities.
02
Request
Request / Contact
New builds, renovations and equipment upgrades of course — plus collaboration between design firms and drawing outsourcing. Rough estimates from the concept stage are welcome too.
03
Recruit
Join Us (Careers)
Hiring contract partners in electrical, mechanical and architectural design. Fully remote and side work OK — apply from anywhere in Japan.
04
Company
Company
An overview of Ash Design (H-design), a first-class architectural design office — history, location (Edogawa, Tokyo), mission and vision.
05
Character
Characters
Our original cast, “Team Ash.” Meet leader Ash and his characterful teammates.
06
Journal
Ash Blog
Columns on architecture and building-services design, plus the latest news, notices, events and hiring topics — posted regularly.