What Build East does

Build East is a private Japanese construction and interior design company headquartered in Numazu, Shizuoka Prefecture, founded in 1988 and incorporated in 2006. It operates as a design-build general contractor with a Special-Class General Construction Permit covering 20 categories (architecture, carpentry, masonry, steel, concrete, interior finishing, etc.) and First-Class Architect Office registration (Shizuoka Prefecture No. 7221). The firm executes projects across commercial facilities, medical clinics, welfare facilities, corporate offices, industrial sites, and residential buildings, primarily in eastern Shizuoka Prefecture with selected nationwide reach.

Core offerings span five specialized sub-brands: Work Box Shizuoka for office/workspace architecture; Trailer House and the newly launched TRH MiNI for towable mobile buildings; Clinic Design Lab (クリニックデザイン研究所) for medical and dental clinic design; FUQXIE (フクシエ) for welfare facility construction with over 20 years of sector experience; and a Land Utilization service matching landowners with welfare operators. The firm also markets a proprietary dual-layer wall sound insulation technology — approved under Shizuoka Prefecture's Management Innovation Plan in 2010 — capable of blocking sound frequencies standard walls cannot, applied to studios, music practice rooms, home theaters, and acoustic-sensitive commercial facilities. Design tooling centers on 3D CAD (JW-CAD and related software).

Revenue is generated primarily through one-time professional services fees for design-build projects, supplemented by trailer house hardware sales (TRH MiNI starting at ¥1.8M tax-included), welfare real estate and land utilization consulting, and ancillary rental income from the headquarters (¥70,000/month office lease). The company has no disclosed external institutional investors and is led by Representative Director Koichi Ishizawa (石澤浩一). Go-to-market is sales-led through a dedicated construction sales department and direct client engagement, supported by digital channels (corporate website, YouTube, Instagram, Facebook, LINE Official Account) and project referral networks. To address Japan's construction labor shortage, Build East participates in the JITCO Technical Intern Training Program (since July 2018) and, in May 2026, registered its trailer houses under the Cabinet Office's Disaster Response Vehicle Registration System (D-TRACE) for emergency deployment.

Name

Build East

Legal name

株式会社 Build East

Website

https://build-east.co.jp

Company type

Private

Founded year

1988

Operating status

Operating

Short description

Build East is a private Japanese design-build contractor in Numazu, Shizuoka Prefecture, delivering commercial interiors, medical clinics, welfare facilities, offices, and trailer houses across eastern Shizuoka and nationwide via specialized sub-brands.

Ownership category

akta.pro rank

Headquarters

HQ city

Numazu

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Marketing or Sales

Revenue model

1. Construction and Interior Design Services: One-time project fees for design and construction services covering commercial facilities, welfare facilities, offices, factories, and residential buildings. Services range from new construction to renovation and remodeling.
2. Trailer House Sales: Sales of trailer houses (TRH MiNI series) priced from 1.8 million yen, designed for various applications including workspaces, storage, and disaster response.
3. Real Estate Trading: Property transactions and land utilization consulting services, particularly for welfare facility development.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Build East provides integrated design, planning, and construction services for commercial interiors, offices, medical clinics, welfare facilities, factories, and residential buildings. The company also designs, builds, and sells towable trailer houses (including the TRH MiNI compact model) for workspaces, storage, and disaster response, and applies a proprietary multi-layer sound insulation technology to acoustic-sensitive commercial spaces.

Product overview

Build East is a construction company offering integrated design, planning, and construction services for commercial facilities, specializing in commercial interior fit-out. The company operates multiple specialized sub-brands: Work Box Shizuoka for office/workspace architecture; Trailer House products (including the new TRH MiNI compact model) for mobile buildings; Clinic Design Research Institute for medical/dental clinic design; and FUQXIE for welfare facility construction. The company also offers land utilization services for welfare facilities and proprietary sound insulation technology. Together, these brands provide comprehensive solutions from residential/commercial building construction to specialized healthcare and accessibility-focused facility development.

Differentiator

Problem solved

Functional benefit

Brands

• Work Box しずおか: 事務所・オフィス建築の専門ブランド。従業員のための快適な労働環境を提供
• トレーラーハウス
• クリニックデザイン研究所
• FUQXIE（フクシエ）
• 土地活用
• 防音

Products and services

• Commercial Interior Design and Construction
• TRH MiNI Trailer House

Quantifiable outcome

• Trailer house registered with Cabinet Office Disaster Response Vehicle Registration System for emergency use
• +1 more outcomes

Named customers11 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Seven partnerships are on record, tiered minor.

• JITCO (Japan International Training Cooperation Organization)minorOthers · 1 July 2018Build East participates in the Technical Intern Training Program under JITCO guidelines, accepting foreign technical intern trainees through approved cooperative associations to address labor shortages in the construction industry.
• JACCA (Japan Anti-Ceiling Collapse Association)minorStrategic or Co-development PartnerJACCA加盟（12静-M024）. The company joined the Japan Anti-Ceiling Collapse Association in 2012 to implement seismic standards for ceiling construction and ensure building safety.
• Shizuoka Prefecture Architects Association (静岡県建築士事務所協会)minorOthersProfessional association membership providing industry networking and professional development.
• Shizuoka SME Owners Association (静岡県中小企業家同友会)minorOthersSME association membership for peer networking and business development.
• Numazu Chamber of Commerce and Industry (沼津商工会議所)minorOthersLocal chamber of commerce membership for business networking and community engagement.
• NPO All Shizuoka Best Community (オールしずおかベストコミュニティ)minorOthersNPO membership supporting community welfare initiatives.
• Shizuoka Real Estate Traders Association (静岡県宅地建物取引業協会)minorOthersReal estate industry association membership supporting property transactions and land utilization services.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Tanseisha Co., Ltd. Japanese commercial interior design and construction specialist serving retail, hospitality, and corporate clients. Highly comparable to Build East's core commercial interior design-build business and target customer segments.
• Nomura Co., Ltd. (乃村工藝社): Japanese commercial space design and construction company specializing in commercial facilities, exhibitions, and retail environments. Directly comparable in commercial interior design-build offerings and enterprise customer base.
• Misawa Homes Co., Ltd. Japanese homebuilder with integrated design-build model. Comparable business architecture with Build East's design-to-construction service model, though Misawa operates at national scale.
• Sekisui Heim Co., Ltd. Japanese design-build homebuilder offering integrated residential construction services. Comparable one-stop design-build business model to Build East, though focused on residential rather than commercial.

Broad incumbents

• Daiwa House Industry Co., Ltd. Japan's largest construction and real estate developer with broad commercial, residential, and welfare facility offerings. Overlaps with Build East across multiple verticals but operates at vastly larger scale as a diversified incumbent.
• Shimizu Corporation: One of Japan's largest general contractors with extensive commercial and institutional building construction. Broad incumbent in the same construction space but at significantly larger scale than Build East.
• Takenaka Corporation: Major Japanese general contractor specializing in commercial, institutional, and high-end construction. Broad incumbent with overlapping capabilities but serves enterprise-scale projects far beyond Build East's typical scope.
• Tokyu Construction Co., Ltd. Major Japanese general contractor with diversified commercial, residential, and civil engineering operations. Broad incumbent operating across many of the same construction verticals as Build East.
• Haseko Corporation: Major Japanese homebuilder and construction company with design-build capabilities. Comparable in residential construction model though operates at significantly larger scale and broader geographic reach.

Emerging players

• North Road Inc. (ノースロード): Japanese trailer house and towable mobile structure manufacturer. Comparable to Build East's trailer house product line (TRH MiNI) though focused on different end uses; both operate in the towable mobile building category in Japan.

Market position

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCMMceGFwpeIPOXZgFUEJg0A
• Facebookfacebook.com/profile.php?id=100063496815124
• Instagraminstagram.com/build_east

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Build East