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Design Supervision · General Construction · Osaka

Honest to space,
devoted to architecture

Towa Construction is a full-service design-build firm based in Osaka, Japan. Building a custom home, luxury house or RC home in Osaka? We handle everything from land survey and design through building-permit application and construction — plus interior styling, hotels and office buildings — with one team and one line of responsibility.

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Japan luxury construction · Osaka architecture firm
2025

About Us

Architecture that
enriches everyday life

Founded in June 2025 in Chuo-ku, Osaka, Towa Construction Co., Ltd. is a full-service design-build firm offering integrated architecture, interior design, soft furnishings, and construction management under one roof.

Guided by our principles of "sincerity" and "devotion", we partner closely with each client to translate their intentions into completed spaces. Our practice spans luxury houses, hotels, office buildings, residential renovation, and clinic / retail design across Osaka and the wider Kansai region.

A first-class architect and a first-class construction manager work together to deliver a single, accountable line from concept through design, interior, construction, and post-handover care.

1st
class-licensed
architectural firm
9
in-house
specialists
2
core service
domains
Osaka
Chuo-ku
headquarters

Team

The people behind
the work

Seasoned professionals carry your vision from first sketch to finished space.

Hiroaki Saito

President

Hiroaki Saito

Founded Towa Construction in 2025, driven by a passion for architecture and home-building. We listen carefully to each client's ideals and aspirations, aiming to be a partner you can entrust with complete peace of mind.

Yuki Seko

1st-class Architect

Yuki Seko

Fluent in both design and site execution. Serves as the bridge between drawing and reality, holding quality, schedule, and cost in single accountability.

Takuto Kitazawa

1st-class Construction Management Engineer

Takuto Kitazawa

Leads on-site quality and safety at the front line. Sequences complex work with precision, turning drawings into built reality.

Yinan Bao

Designer / Planner

Yinan Bao

Reads each client's way of living closely to design layout, storage, light, and flow. Multilingual, she also bridges communication with overseas clients.

Projects

Featured work

Chuo-ku Residence — Interior & Soft Furnishings
Soft Furnishings

Chuo-ku Residence — Interior & Soft Furnishings

Chuo-ku, Osaka
 Kujo Hotel — 3-Story Renovation
Hotel Renovation

Kujo Hotel — 3-Story Renovation

Nishi-ku, Osaka
 Kyoto Sakyo Residence — Interior & Soft Furnishings
Soft Furnishings

Kyoto Sakyo Residence — Interior & Soft Furnishings

Sakyo-ku, Kyoto
 Shiokusa Hotel — 10-Story New Build
New-Build Hotel

Shiokusa Hotel — 10-Story New Build

Naniwa-ku, Osaka
 Daikokucho Hotel — 10-Story New Build
New-Build Hotel

Daikokucho Hotel — 10-Story New Build

Naniwa-ku, Osaka
 Ikutamacho Hotel — 7-Story Renovation
Hotel Renovation

Ikutamacho Hotel — 7-Story Renovation

Tennoji-ku, Osaka

Services

What we deliver

01

Architectural design

From site survey and schematic planning through detailed construction documents, we deliver designs that balance function with poetry. Residential, commercial, medical, hospitality — we work across every typology.

02

Interior & soft furnishings

We integrate built-in joinery with furniture, drapery, lighting, and art under one design hand. Spaces that hold the family's daily life and the brand's narrative as one. 3D visualisation available for overseas owners reviewing remotely.

03

Construction & after-care

A first-class construction manager runs the site, protecting quality, budget, and schedule. After handover, scheduled inspections at year 1 / 2 / 5 / 10 and 24-hour emergency response keep the relationship long-term. Renovation and seismic retrofit also handled.

Methods & Capabilities

What We Can Build

A

Structure Systems

Structures

TimberPost-and-beam · 2×4 · SE method · Glulam
Reinforced concreteRahmen · Shear-wall systems
Exposed ConcreteArchitectural off-form · Ando-style precision
Steel (S-frame)Heavy steel · Light steel · SRC
HybridTimber × RC · Timber × Steel
B

Project Scope

Project Scope

New constructionResidential · Commercial · Hospitality · Medical
Major renovationFull-building revival (¥30M+)
Old folk-house revivalMachiya, traditional houses with tea-rooms
Extensions & MEPLayout changes · expansion · full systems renewal
Seismic retrofit · DemoDiagnosis, reinforcement, demolition
C

Interior & Furnishings

Interior & Furnishings

Soft furnishings TotalFurniture · drapery · lighting · art selection
Custom built-insKitchen · storage · joinery · stairs · paneling
Overseas procurement OverseasDirect import: EU / Nordic / Asia furniture
Premium fixturesSanitary · HVAC · kitchen · AV install
Interior stylingPre-handover styling and photography
D

Special Capabilities

Special Capabilities

Isolation & dampingBase isolation / damper systems for mid- to high-rise
Long-life / ZEH / LCCMEnergy class 6 · low-carbon · zero-energy
Fire-rated timberFire-resistant glulam for urban contexts
Tea house & traditionalSukiya · shoin · tea-room design/build
Villa & resort buildsKaruizawa · Awaji · Hokkaido · Okinawa

* Minimum project value JPY 30M. We do not take on small-scale renovations below that threshold.

Process

From Inquiry to Aftercare

01

Inquiry & First Consultation

1–2 weeks

We listen carefully to your vision, site, budget and lifestyle. Online meetings available for overseas owners.

02

Site Survey & Code Review

2–3 weeks

On-site analysis of zoning, height limits, soil and boundaries to ground the schematic phase. Survey and soil testing arranged as needed.

03

Schematic Design & Concept

1–2 months

Floor plans, elevations, concept sketches and a rough budget. We iterate through multiple schemes until you're satisfied. 3D visualization included.

04

Design Development & Quotation

2–4 months

Full structural, MEP and finishes drawings with a final estimate. Building-permit filing runs in parallel.

05

Contract & Pre-construction

2–4 weeks

Contract signing, neighborhood greetings, ground-breaking ceremony and site preparation.

06

Construction & Reporting

8–18 months

A first-class site supervisor oversees daily progress. Monthly progress reports and on-site walkthroughs.

07

Completion, Handover & Aftercare

10+ years

Final inspection, handover and operations briefing. 1/2/5/10-year inspections plus 24-hour emergency response.

Project Management Structure

How we run a project

A five-tier organization that supports every project. From statutory roles (lead engineer, safety supervisor) through specialty subcontractors to independent inspection — accountability is always clear at every level.

See how we run a project →

Knowledge Base

Understanding Japanese construction

01
PROCESS

The Japanese build process

A step-by-step walk-through of the journey from land survey to handover — the way it actually happens in Japan.
02
FAQ

FAQ for non-Japanese owners

Permits, financing, residency, and the practical questions overseas clients ask before they commit.
03
STRUCTURE

RC vs. wood construction

A side-by-side comparison of Japan's two dominant residential systems on cost, seismic performance, and lifespan.
Browse the full knowledge base ⌘ Budget Estimator →

Company

Company details

CompanyTowa Construction Co., Ltd.
AddressWhity Shimanouchi 202, 1-4-32 Shimanouchi, Chuo-ku, Osaka 542-0082, Japan
TEL / FAXTEL: +81-6-6125-5498　/　FAX: +81-6-6125-5499
Email[email protected]
BusinessArchitectural planning, design & supervision
Founded6 June 2025 (Reiwa 7)
CapitalJPY 40,000,000
LicenseConstruction Business License · Osaka Governor License (Toku-7) No. 163973
PresidentHiroaki Saito
Managing architectYuki Seko
Headcount9
Qualifications1× first-class architect · 1× first-class construction manager
Bank
Sumitomo Mitsui Banking Corp.Mizuho BankMUFG BankResona BankSBI Sumishin Net BankSBJ Bank
Licensed TradesGeneral construction, carpentry, roofing, steel structure, interior finishing, tile / brick / block (all Specified Construction Business)
Construction Business License Plate — Towa Construction Co., Ltd.

Construction Business License Plate — Osaka Prefectural Governor License (Toku-7) No. 163973. Displayed at the head office per legal requirement.

1-4-32 Shimanouchi, Chuo-ku, Osaka 542-0082 Open in Google Maps →

Overseas Owner Support

For overseas clients

Building in Japan from abroad? We handle language, remittance, and communication end-to-end so you don't need to fly in.

Languages
JP · EN · ZH · KO · AR full website in 5 languages
Interpreter
Construction-specialist interpreters arranged JP · EN · ZH · KO
Currency
Japanese Yen (JPY) only
International wire
SWIFT accepted Banking: SMBC · MUFG · Mizuho · Resona
FX recommendation
Convert to JPY at your local bank before wiring better rates and fees than converting in Japan
Business hours
Weekdays 9:00–18:00 JST · by appointment scheduled to overlap your time zone
No travel needed
Weekly Zoom progress meeting + monthly PDF report STANDARD

FAQ

Common questions
before you reach out

Practical answers for overseas owners and first-time clients — the questions we hear most often.

Yes. We provide weekly Zoom standups, monthly reports in JP/EN/ZH, live streams of key milestones, and dedicated construction-specialist interpreters. We have completed projects with owners who never travelled to Japan.
First consultation is free, about 60 minutes. Bring 3–5 reference images, your budget range, and target timeline. We can meet at our Osaka office or via Zoom.
Per-tsubo budget estimate: free, within 3 business days. Detailed quote follows the schematic design phase — about 2 weeks. The initial budget estimate is offered with no commitment.
Typically 4–6 months: schematic design (2–3 months) → detailed design (2–4 months) → building permit (1–2 months) → contractor selection (1 month).
Major changes during schematic design are welcome. After detailed design begins, we will always quantify the cost and schedule impact before any change is locked in.
10 years structural · 10 years waterproofing · 2 years equipment by Japanese statutory protection. We add complimentary inspections at year 1, 2, 5, and 10, plus a 24-hour emergency response line.
From single-family residences (¥30M+) up to hotels, commercial, and office buildings reaching ¥2 billion in scale. Mega-projects (10+ story office buildings) are delivered through JV with major general contractors.
Yes. We accept design + build separated engagements. We first assess the completeness of the drawings, then propose a supervision framework to match.

Contact

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Or call us at +81-6-6125-5498 · [email protected]

Careers

Build the future,
together

We are seeking experienced professionals (5+ years) with a passion for luxury residential architecture. Join us in crafting spaces of lasting quality.

Open ×1

1st-class Architect

Design & Supervision

Required
1st-class architect license (Japan)
Experience
5+ years practical
Scope
Design and supervision of residential & commercial projects
Preferred
CAD/BIM experience
Luxury residential design experience
Multilingual candidates welcomed
Compensation
From JPY 500K monthly · Competitive annual package · Full social insurance
Open ×2

1st-class Construction Manager

Site Supervision

Required
1st-class architectural construction management engineer license
Japanese driver's license
Experience
5+ years practical
Scope
Site management, quality control, safety oversight
Preferred
Residential & commercial site experience
Safety manager certification
Leadership skills
Compensation
From JPY 450K monthly · Competitive annual package · Full social insurance

Please send your resume and portfolio to
[email protected]