株式会社中川

What 株式会社中川 does

株式会社中川 (Nakagawa Co., Ltd.) is a third-generation, family-owned roofing construction company headquartered in Isesaki City, Gunma Prefecture, Japan. Founded in 1868 (Meiji 1), the firm provides roofing, waterproofing, exterior wall, solar photovoltaic installation, and building maintenance services to residential, commercial, and public-sector clients across the Kanto region, with concentrated coverage in Gunma and Saitama prefectures. Takehiko Nakagawa (中川武彦) serves as representative director of the closely held private company, which carries ¥10 million in stated capital and disclosed headcount of 5 employees.

The company operates four physical sites across northern Kanto — the Isesaki headquarters, a Hashie sales office, an Akabori distribution warehouse, and a Maebashi Arai branch — and holds several proprietary construction methods and products, including the Top Master 2000 roof tile, the なんばん工法 (Nanban method), the 引掛桟瓦葺き工法 (Hikikake-sengawara-buki method), and 防災瓦 (disaster-prevention tiles). It is a registered instructor entity within the National Federation of Roofing Construction Associations and a Roof Trust Store Gunma dealership, with crew rosters that include 1級技能士 (Grade-1 certified skilled technicians).

The business model is project-based construction services revenue. The disclosed volume of 1,000+ units/year delivered to major Japanese housing manufacturers functions as an anchor production base, while direct contracts with residential, commercial, and public-sector clients (including government works) provide diversification. The 5-employee headcount relative to volume implies heavy reliance on subcontracted labor for fulfillment, making the firm effectively a project-management and quality-control entity with proprietary method licensing, specialist installation capacity, and a regional distribution footprint rather than a high-headcount general contractor.

Name

株式会社中川

Legal name

株式会社中川

Website

https://nakagawa-roof.co.jp

Company type

Private

Founded year

1868

Operating status

Operating

Headcount range

1–10 employees

Short description

株式会社中川 (Nakagawa Co., Ltd.) is a family-owned roofing contractor founded in 1868 in Isesaki City, Gunma Prefecture, Japan, providing roofing, waterproofing, solar PV, and exterior wall services to residential, commercial, and public-sector clients across the Kanto region.

Ownership category

akta.pro rank

Product category

Roofing Construction Services

NAICS

Roofing Contractors (23816)

SIC

Asphalt Paving & Roofing Materials (2950)

akta.pro industry

PRIMARYHSAPAKAA

Roof Installation & Replacement

Home & Personal Services/Residential Renovation Services/Roofing, Siding & Exterior Renovation

SECONDARYHSAPAKAB

Roof Repair & Leak Remediation

Home & Personal Services/Residential Renovation Services/Roofing, Siding & Exterior Renovation

SECONDARYHSAGAKAH

Roof Inspection, Preventive Maintenance & Tune-Ups

Home & Personal Services/Home Repair, Maintenance & Handyman/Roof Repair & Maintenance

SECONDARYHSAGAKAC

Tile Roof Repair (Clay/Concrete/Slate)

Home & Personal Services/Home Repair, Maintenance & Handyman/Roof Repair & Maintenance

SECONDARYIMADAFAJ

Flashing, Edge Metal & Roof Accessories

Industrials, Manufacturing & Construction/Building Materials & Products/Roofing Materials & Systems

Keywords

• Roofing construction services
• Waterproofing installation
• Solar roof installation
• Exterior wall construction
• Roof tile materials

Headquarters

HQ city

Isesaki (伊勢崎市)

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Roofing Construction Services: Core revenue stream from comprehensive roofing construction including Japanese tiles, flat tiles, slate tiles, cement tiles, and metal roofing. Covers new construction, replacement, and renovation projects for residential, commercial, and public buildings. Provided by certified craftsmen under strict quality management systems.
2. Waterproofing Construction: Specialized waterproofing construction services to prevent water leakage in buildings, addressing both flat and sloped roof waterproofing needs.
3. Solar Photovoltaic System Installation: Installation of integrated solar photovoltaic roof tiles and retrofit panel systems. Includes administrative support for government subsidy applications through the Energy Foundation.
4. Exterior Wall Construction: Panel construction, metal siding, ceramic siding, ALC, and dry tile exterior wall finishing services.
5. Maintenance and Inspection Services: Post-construction inspection, repair, and ongoing maintenance services including checks for loose nails, tile displacement, cracking, and repainting. Includes regular inspection programs.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

株式会社中川 is a comprehensive roofing construction contractor that delivers roof construction (Japanese tiles, flat tiles, slate, cement, metal), waterproofing, exterior wall installation, solar photovoltaic system installation, and post-construction maintenance and inspection services. The company also sells roofing tile materials and dispatches technical personnel to disaster-affected areas. Services are delivered by certified craftsmen using proprietary methods including 引掛桟瓦葺き工法, なんばん工法, and the Top Master 2000 eaves system.

Product overview

株式会社中川 is a comprehensive roofing contractor offering a portfolio of roofing materials, construction methods, and related services. Core offerings include CERAM-F2 and CERAM-FS ceramic roof tiles, disaster-resistant 引掛桟瓦葺き工法 tiles, and the proprietary トップマスター2000 integrated eaves water-drain plate. The company provides solar roofing solutions through the CERAM-F FLAT and サンビスタ solar tile systems, alongside environmental green-roof tiles. Its service suite spans new roof construction, waterproofing, exterior wall work, solar photovoltaic installation, and post-construction maintenance and inspection. Specialized construction methods include the なんばん工法 for ridge durability and防水桟工法 for heavy-rain waterproofing. The company also offers a technician dispatch service for disaster relief and operates a project portfolio under the 中川コレクション brand. The portfolio is unified by a commitment to earthquake and wind resistance, weatherproofing, and long-term durability.

Differentiator

Problem solved

Functional benefit

Products and services

• 屋根工事 (Roof Construction Service) Full-service roof construction covering Japanese tiles, flat tiles, slate tiles, cement tiles, roof metalwork, and roofing material sales for residential, commercial, and public buildings. Includes 引掛桟瓦葺き工法 (Hook-Rafter Tile Roofing Method) for earthquake and wind resistance. Delivered by certified craftsmen under strict quality management systems.
• 防水工事 (Waterproofing Construction Service) Waterproofing construction using rubber asphalt roofing, high-permeability waterproof roofing, and the Free Air Method (フリーエアー工法) to prevent water ingress in both flat and sloped roofs. Addresses both new construction and renovation needs.
• 外壁工事 (Exterior Wall Construction Service) Exterior wall construction services including panel installation, metal siding, ceramic siding, ALC, and dry tile exterior wall finishing, delivered by professional craftsmen for residential and commercial buildings.
• 太陽光発電工事 (Solar Photovoltaic System Installation) Installation of integrated solar photovoltaic roof tile systems and retrofit panel systems, including the サンビスタ (Sunvista) fireproof-certified solar roof tile. Includes administrative support for government subsidy applications through the Energy Foundation.
• メンテナンス・点検 (Maintenance and Inspection Service) Post-construction maintenance and inspection services including roof checklist inspection, drainage clearing, nail/screw tightening, tile alignment checks, joint compound inspection, surface cleaning, and reform consultation. Includes regular inspection programs.
• 瓦資材販売 (Roofing Tile Material Sales) Sales of various roofing tile materials including Japanese tiles, flat tiles, single tiles, cement tiles, Coloniel tiles, steel plate tiles, and S-type tiles sourced from multiple manufacturers for residential and commercial projects.
• 防災瓦 (Disaster-Prevention Tile) with 引掛桟瓦葺き工法 Earthquake and disaster-resistant interlocking roof tile with a patented locking mechanism that firmly secures tiles together. Tiles resist displacement even in earthquakes equivalent to the Great Hanshin-Awaji Earthquake and typhoons. Includes 15mm work length adjustment in the overlap lock section and a patented central ridge pattern that reduces rainwater direct inflow at tile connections. Verified by major housing manufacturers.
• トップマスター2000 (Top Master 2000) Proprietary integrated eaves water-drain plate combining water-draining plate, tile seat, and face board into a single unit. Uses a spring-back method allowing one-touch installation of the face board without nails or adhesive, reducing construction labor to one-third of conventional methods. Made of color stainless steel (0.3mm) or color tatara steel (0.27mm), 1,820mm length. Fully recyclable.
• CERAM-F2 Ceramic Roof Tile Ceramic roof tile ranked #1 in monthly popularity, compatible with flat roof solar integration. Installed by the company as part of its roofing construction offerings.
• CERAM-FS Ceramic Roof Tile Ceramic roof tile ranked #2 in monthly popularity, installed by the company as part of its roofing construction offerings.
• CERAM-F FLAT (サンビスタ 平板瓦一体型) Solar Roof Tile Flat tile-integrated solar photovoltaic module where the solar cell module itself serves as the roof material. Certified as fireproof construction material by the Minister of Land, Infrastructure, Transport and Tourism (certification number: DR-0165).
• 環境瓦 (Environmental Green Roof Tile) Environmentally-friendly roof tile combining ceramic tiles with moss for green roof applications on sloped roofs. Achieves up to 15.6°C temperature suppression in summer and requires no maintenance watering, fertilization, or weeding. Compatible with photovoltaic systems.
• サンビスタ 据置型 (Sunvista Retrofit Solar Panel System) Retrofit solar panel system installed on existing roofs without replacement, available in multiple configurations for gable, hip, and flat roof types.

Named customers6 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Five partnerships are on record, tiered minor and core.

• TOSTEM (トステム)minorChannel Partner/ Reseller/ DistributorTOSTEM branding appears in the partner/brands section of the website, indicating a distribution or referral relationship for building material products.
• KMEW (クボタ松下電工外装)minorChannel Partner/ Reseller/ DistributorKMEW (Kubota Matsushita Denko Exterior) branding appears in the partner section, indicating a product supply and distribution relationship for roofing and exterior materials.
• 全日本瓦工事業連盟coreStrategic or Co-development PartnerNakagawa is a member of the 全日本瓦工事業連盟 (National Roof Tile Industry Federation), a nationwide organization comprising 54 member associations and approximately 4,000 businesses, recognized by the Ministry of Land, Infrastructure, Transport and Tourism. The federation provides a trusted contractor referral network and industry standards. Nakagawa also dispatches technicians to disaster areas through the federation's network.
• 全国瓦工事組合coreStrategic or Co-development PartnerNakagawa participates in the National Roof Construction Association network, providing access to roof craftsmen across Japan for mutual support, knowledge sharing, and technician dispatch during disasters.
• 伊勢崎法人会minorOthersMember of the Isesaki Chamber of Commerce and Industry (伊勢崎法人会), a local business association providing networking and industry connections.

Scale indicators4 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• Greenwood Industries: US commercial/industrial roofing and sheet metal contractor offering installation, repair, and custom metal fabrication. Comparable as a specialty roofing + sheet metal contractor — directly analogous to Nakagawa's Top Master 2000 sheet-metal eave system plus roofing services.
• Bone Dry Roofing: US-based residential roofing contractor offering installation, repair, and maintenance services across multiple states. Comparable as a regionally-anchored roofing contractor with diversified service lines (roofing, gutters, insulation) targeting homeowners, builders, and commercial clients.
• Tecta America: One of the largest US commercial roofing contractors, providing installation, repair, and maintenance of multiple roof systems (BUR, single-ply, metal). Comparable as a full-service roofing contractor with national reach across commercial and institutional segments.
• Nations Roof: US commercial roofing contractor serving national accounts with installation, maintenance, and repair across BUR, single-ply, metal, and steep-slope systems. Comparable as a large-scale contractor delivering multi-system roofing services for enterprise and institutional customers.
• Baker Roofing Company: US residential and commercial roofing contractor offering installation, repair, and maintenance across multiple roof types. Comparable as a long-established regional roofing contractor with diversified service lines including gutters, siding, and exterior work.
• Roofing Corp of America: US residential and commercial roofing contractor operating across multiple states with service lines spanning repair, replacement, and inspection. Comparable as a multi-branch roofing contractor with diversified service offerings for homeowners and commercial clients.

Broad incumbents

• TOTO Ltd. Major Japanese building products manufacturer (bathroom, kitchen, exterior, ceramic tiles). Comparable as a broad Japanese building-materials incumbent with portfolio overlap in ceramic roofing/exterior products.
• LIXIL Corporation: Japan's largest building materials and housing products manufacturer, offering roofing materials, siding, windows, and kitchens/baths. Comparable as a broad incumbent in the Japanese building envelope category — overlap with Nakagawa's roofing, exterior wall, and materials distribution businesses.

Emerging players

• KMEW Co., Ltd. (ケイミュー): Japanese manufacturer of exterior wall and roofing materials (ceramic siding, metal roofing) — confirmed Nakagawa distribution partner per the website. Comparable as a roofing materials supplier with whom Nakagawa competes at the product level and partners at the distribution level.

Others

• TOSTEM (LIXIL Group): LIXIL-owned Japanese brand for windows, doors, and building exteriors — listed partner on Nakagawa's website. Comparable as a material brand partner that channels demand to contractors like Nakagawa via referral/distribution relationships.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E4%B8%AD%E5%B7%9D

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 株式会社中川