三谷産業株式会社

What 三谷産業株式会社 does

Mitani Industry Co., Ltd. (三谷産業株式会社) is a private Japanese construction company founded on September 1, 1978, in the Numakuma area of Fukuyama City, Hiroshima Prefecture, operating as a regional construction services firm with ¥40 million registered capital and approximately 10 employees. The company runs four business lines: residential renovation (住宅リフォーム), water supply and drainage/sanitation equipment installation (給排水・衛生設備工事), specialized engineering work (特殊工事) including IPH internal pressure filling reinforcement and concrete X-ray non-destructive inspection, and real estate brokerage (不動産). Its primary service area is the Fukuyama region, with a documented satellite office area extending toward Onomichi City (尾道市) within Hiroshima Prefecture.

The company's operating model is anchored in a self-built construction system (自社施工体制) covering design consultation through construction, with work executed by internal multi-skilled staff rather than outsourced subcontractors. Its proprietary IPH method (IPH内圧充填補強工事) is registered with Japan's Ministry of Land, Infrastructure, Transport and Tourism NETIS database (registration No.CG-070007-A) under technical evaluation certificate No.0009 from the Japan Society of Civil Engineers, using high-flow epoxy resin at ultra-low pressure (0.06±0.01 to 0.02 N/mm²) to fill micro-cracks as narrow as 0.01mm in aging concrete structures. It also operates a mobile concrete X-ray imaging service (コンクリートX線撮影) that deploys a dark-room-equipped vehicle on-site and delivers a positioning report on embedded objects (electrical conduits, communication cables, gas pipes, rebar) within 20–30 minutes, with capability up to 300mm wall thickness.

Mitani operates a project-based professional services model with custom quotations per engagement, no publicly disclosed pricing, and no digital sales or marketing channels. Revenue derives from construction contract fees, equipment installation fees, specialized engineering job fees, and real estate transaction/agency commissions. The company is founder-controlled by Mitani Ryohei (三谷良平), who serves as Representative Director (代表取締役) and holds multiple professional certifications including architect, construction management, and real estate transaction manager. The customer base is highly fragmented across individual residential clients (primary), local enterprises and factories, schools, and public facilities, with documented case studies spanning single-residence repairs to commercial projects such as a shopping center terrace renovation and bridge concrete reinforcement using the IPH method.

Name

三谷産業株式会社

Legal name

三谷産業株式会社

Website

https://mitani-industry.co.jp

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

1–10 employees

Short description

Mitani Industry is a private Japanese construction firm in Fukuyama, Hiroshima, founded in 1978, offering residential renovation, water/sanitation installation, specialized engineering (IPH concrete repair, X-ray inspection), and real estate brokerage to homeowners, businesses, schools, and public facilities in the Fukuyama region.

Ownership category

akta.pro rank

Product category

Construction and Building Renovation Services

NAICS

Commercial and Institutional Building Construction (236220), Residential Building Construction (23611), Nonresidential Building Construction (2362), Water and Sewer Line and Related Structures Construction (237110)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Construction Management & General Contracting (EPCM, Scheduling, QA/QC, HSE) (EUAMAFAJ)

Keywords

• Residential renovation services
• Construction contracting
• Water supply installation
• Concrete repair services
• Real estate brokerage

Headquarters

HQ city

福山市

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. 建築一式工事・改修工事: 住宅リフォーム、土木建築請負業として、大規模改修工事から網戸の張替えや建物の清掃まで大小様々な建设工作を受注。設計見積りから施工まで一貫して対応。
2. 給排水・衛生設備工事: 事務所や事業所、店舗における屋内外の給排水设备的設置・施工。トイレ・洗面所などの衛生设备的設置や給水管・排水管・給湯設備などの設置工事。
3. 特殊工事（IPH・非破壊検査）: IPH内圧充填補強工事やコンクリートX線撮影などの非破壊検査业务的請負。建築・製造分野における品質管理の高度化・効率化をサポート。
4. 不動産事業: 売土地や駐車場などの不动产情報の取り扱い。土地の取得・売却の相談、賃貸物件の紹介など。宅地建物取引業主任者として媒介・代理业务を行う。

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

三谷産業株式会社 is a regional construction services company based in Fukuyama City, Hiroshima Prefecture, that provides residential renovation, water supply and sanitary equipment installation, and specialized concrete repair and non-destructive inspection services (including the proprietary IPH internal pressure filling reinforcement method and concrete X-ray imaging) to individual homeowners, local enterprises, and public facilities across the Fukuyama area, supplemented by a real estate brokerage service.

Product overview

三谷産業株式会社は建築・建設업을主营하는 지역 밀착형 기업으로, 네 가지 핵심 서비스로 구성된다. (1) 주택 리모델링: 대규모改修 공사에서 망정 교체, 건물 청소까지 다양한 리모델링 공사 및 애프터서비스, (2) 급배수·위생설비 공사: 옥내외 급배수 설비, 위생설비 설치 및 배관 공사, (3) 특수 공사: IPH 내압 충전 보강 공사 및 콘크리트 X선 촬영 등 비파괴 검사 서비스를 제공하고, (4) 부동산: 매매土地 및 주차장 등 부동산 정보 서비스. 특히 IPH 공법은 국토교통省 NETIS 등록된 자사 특수 기술로, 콘크리트 구조물 보강 분야에서 차별화된 역량을 보유.

Differentiator

Problem solved

Functional benefit

Products and services

• Residential Reform (住宅リフォーム) Comprehensive residential renovation services ranging from large-scale building modifications to small tasks such as screen door replacement and building cleaning, with design consultation through to construction and after-service/maintenance support for individual homeowners and residential property owners in the Fukuyama area.
• Water Supply and Sanitary Equipment Work (給排水・衛生設備工事) Installation of indoor and outdoor water supply and drainage equipment for offices, business sites, and commercial stores, including sanitary equipment such as toilets and washbasins, as well as water supply pipes, drainage pipes, and hot water supply equipment installation.
• Special Engineering Services (特殊工事) Specialized engineering services supporting quality management advancement and efficiency in the construction and manufacturing sectors through IPH internal pressure filling reinforcement work and non-destructive inspection such as concrete X-ray imaging to prevent problems and accidents.
• IPH Internal Pressure Filling Reinforcement Work (IPH内圧充填補強工事) A specialized concrete reinforcement method addressing deterioration such as spalling and rebar corrosion caused by aging of concrete structures, characterized by high-density filling, improved durability, rebar rust prevention, and neutralization suppression; registered as a NETIS product by Japan's Ministry of Land, Infrastructure, Transport and Tourism (No.CG-070007-A).
• Concrete X-ray Imaging (コンクリートX線撮影) Non-destructive inspection service that uses X-rays to photograph the interior of concrete and accurately identify the location and condition of embedded objects such as electrical conduits, communication cables, gas pipes, and rebar, supporting up to 300mm thickness inspection with results available within 20-30 minutes via mobile darkroom-equipped vehicle.
• Real Estate Brokerage (不動産) Real estate brokerage services handling information on land for sale and parking lots, providing consultation on land purchase and sale as well as introduction of rental properties, acting as a real estate transaction manager with the company operating as a licensed 宅地建物取引業者 (building lot and building transaction operator).

Quantifiable outcome

• IPH工法は0.1mm以下のクラック（実績では0.01mm程度）への注入が可能で、新設時よりコンクリート躯体強度が増す

Named customers6 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Sho-Bond Holdings (ショーボンド建設): Listed Japanese specialty contractor (TSE:1414) focused on concrete structural repair and reinforcement. Most directly comparable to Mitani's IPH concrete reinforcement and non-destructive inspection work, though dramatically larger in scale (>$1B revenue). Shares the same core competency of concrete infrastructure renewal.

Broad incumbents

• Sekisui House (積水ハウス): Japan's largest homebuilder (TSE:1928) with significant remodeling/renovation business alongside new home construction. Comparable to Mitani's residential reform and renovation core, but operating at national scale with vastly different resource base.
• Daito Trust Construction (大東建託): Major Japanese construction and real estate company (TSE:1878) offering rental housing construction, real estate brokerage, and lifestyle services. Overlaps with Mitani's combined construction + real estate brokerage positioning, though at vastly larger scale and with rental housing focus.
• Tama Home (タマホーム): Mid-size Japanese homebuilder (TSE:1419) focused on affordable custom homes. Shares Mitani's residential construction focus and works with regional sales channels, though concentrated on new builds rather than renovations.
• Okumura Corporation (奥村組): Established Japanese general contractor (TSE:1833) with civil engineering, building construction, and infrastructure renewal capabilities. Comparable to Mitani on the construction side, particularly on the bridge and infrastructure repair work where Mitani deploys IPH technology.
• Misawa Home (ミサワホーム): Listed Japanese homebuilder (TSE:1722) offering new construction, remodeling, and lifestyle services across Japan. Comparable on the renovation/reform side, particularly for housing stock renewal, though at significantly larger scale.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

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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 三谷産業株式会社