株式会社三友

What 株式会社三友 does

株式会社三友 (Sanyu Co., Ltd.) is a privately held, diversified regional Japanese company founded in 1947 and headquartered in Hōfu City, Yamaguchi Prefecture. It operates across eight business divisions spanning LP gas supply and energy services, home renovation and appliances, NTT DoCoMo mobile retail, building materials, civil engineering and public works construction, information systems, and a comprehensive disaster prevention project office. Its core technology is a designated core LPG filling station (中核充填所) — one of approximately 340 nationwide and the sole designated facility for Hōfu/Yamaguchi Prefecture — equipped with 20t and 15t storage tanks, 54kVA and 9.9kVA backup generators, satellite phones, and LP gas delivery vehicles enabling autonomous operation during disasters.

Sanyu generates revenue through four primary streams: (1) recurring monthly LP gas subscriptions to residential and commercial customers (¥2,000 basic fee plus tiered volume charges from ¥629/m³ down to ¥455/m³); (2) one-time home renovation, kitchen/bath/toilet installation, and home appliance sales sourced through authorized dealerships with TOTO, Takara Standard, Paloma, Noritz, Rinnai, and Panasonic; (3) NTT DoCoMo device sales and recurring service commissions across three directly managed Docomo shops in Hōfu and Yamaguchi cities; and (4) competitive-bid public works contracts covering traffic safety facilities, slope protection, bridge maintenance, and tunnel repair for the Ministry of Land, Infrastructure, Transport and Tourism, Yamaguchi Prefecture, and municipal governments.

The company primarily serves residential households and government clients within Yamaguchi Prefecture, with a smaller footprint of SMB commercial customers (restaurants, salons, nursing care facilities) in the surrounding region. Distribution is conducted through directly operated Docomo retail stores, direct field sales by company engineers, and public works bidding channels. The Building Materials Division holds triple JIS Q certifications (ISO 9001:2015, ISO 14001:2015, ISO 45001:2018), and the company received the FY2016 Ministry of Economy, Trade and Industry Award for Excellent Manufacturing Plant in recognition of its disaster-resilient LPG infrastructure. In 2020, Sanyu declared a 'Third Founding Day' with a 'Think & Change' repositioning initiative, and has since expanded into carbon-neutral LP gas supply (2023) and consolidated regional gas operators into the Hikari City office (2025).

Name

株式会社三友

Legal name

株式会社三友

Website

https://san-yu.co.jp

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

1–10 employees

Short description

株式会社三友 (Sanyu Co., Ltd.) is a privately held diversified regional company in Yamaguchi Prefecture, Japan, operating across LP gas supply, home renovation, NTT DoCoMo mobile retail, and government civil works since 1947. It serves residential households, SMBs, and public-sector clients through eight business divisions anchored by a designated disaster-resilient core LPG filling station.

Ownership category

akta.pro rank

Product category

Building Materials and Energy Services

NAICS

Utilities (22)

SIC

Natural Gas Distribution (4924)

akta.pro primary industry

Building Materials & Home Improvement Distribution Centers (TLALAEAH)

Keywords

• LP gas supply
• Home renovation services
• Building materials construction
• Mobile telecommunications retail
• Public works contracting

Headquarters

HQ city

Hōfu (防府市)

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. LP Gas Supply: Recurring LP gas supply to residential and commercial customers, with monthly billing based on consumption (basic monthly fee plus per-unit volume charges). Standard plan has a basic charge of ¥2,000 plus tiered volume rates from ¥629/m³ down to ¥455/m³ at higher consumption levels.
2. Home Renovation and Installation Services: One-time revenue from professional installation, renovation, and construction services including system baths, kitchens, toilets, water heaters, and building materials. Includes related repair and maintenance services.
3. NTT DoCoMo Agency (Mobile Services): Revenue from operating Docomo shops as an authorized dealer, including device sales and monthly service commissions from NTT DoCoMo subscriptions.
4. Construction and Civil Engineering: Public works and infrastructure construction including traffic safety facilities, slope protection, bridge maintenance, and tunnel repair for national, prefectural, and municipal government clients. Managed through the First Building Materials Division.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

株式会社三友 is a diversified services company operating eight internal divisions in Yamaguchi Prefecture, Japan. Its core offerings include (1) LP gas supply to residential and commercial customers through the Busshi Division with a designated core LPG filling station, (2) home renovation services for bathrooms, kitchens, toilets, and water heaters through the Sanyu Reform Center, (3) public-works construction including traffic safety facilities, slope protection, and bridge/tunnel maintenance through Building Materials Division 1, (4) NTT DoCoMo mobile retail services through three directly operated Docomo shops in Hofu and Yamaguchi cities, and (5) authorized distribution of major Japanese home appliance brands (TOTO, Takara Standard, Paloma, Noritz, Rinnai, Panasonic).

Product overview

株式会社三友 is a diversified company operating primarily in Yamaguchi Prefecture, Japan. The company operates multiple divisions offering a comprehensive portfolio of products and services. The main business segments include: (1) Building Materials Division 1 handling traffic safety facilities, park facilities, and slope protection construction; (2) LP Gas Supply through the Busshi Division providing energy services including carbon-neutral options; (3) NTT DoCoMo mobile shop operations; (4) A comprehensive reform/refurbishment center offering system bathrooms (system baths from Takara Standard and TOTO), system kitchens (Cleanup Stedia, TOTO Mitte), toilets (TOTO Neorest, LIXIL Pleas), bathroom vanities, and water heater replacements; (5) Home appliances including air conditioners (Mitsubishi Z Series), gas water heaters (Noritz hybrid, Paloma), built-in cooktops, range hoods, clothes dryers (Rinnai Kanta-kun), refrigerators/freezers, and IH cooking heaters; and (6) Disaster prevention products. The company also operates Mobile Systems Division and Information Systems Division. Products are primarily sourced from major Japanese manufacturers including TOTO, Takara Standard, Paloma, Noritz, Rinnai, Panasonic, and Sharp.

Differentiator

Problem solved

Functional benefit

Products and services

• LP Gas Supply (LPガス供給) Recurring LP gas distribution service for residential and commercial customers across Yamaguchi Prefecture through the Busshi Division, with monthly billing based on basic charge plus tiered volume rates. Includes carbon-neutral gas options and is supported by the company's designated core LPG filling station with disaster-resilient infrastructure.
• Home Renovation Services — Sanyu Reform Center (三友リフォームセンター) Comprehensive home renovation services including system baths, system kitchens, toilets, bathroom vanities, water heaters, and solar panel installation, with housing equipment and after-care support. Uses authorized-dealer products from Takara Standard, TOTO, LIXIL, and Cleanup.
• Building Materials Division 1 — Public Works Construction (建材第一事業部) Public-works construction services including traffic safety facility installation, park facility construction, and slope protection engineering. Covers guardrails, fences, bridge repairs, and tunnel maintenance for national, prefectural, and municipal government clients across Yamaguchi Prefecture. Holds ISO 9001, ISO 14001, and ISO 45001 certifications.
• NTT DoCoMo Shop Operations (ドコモショップ) Authorized NTT DoCoMo dealer operating three directly managed mobile retail shops in Hofu and Yamaguchi cities selling mobile devices and managing mobile service subscriptions. Includes monthly Docomo smartphone instruction classes for customers. Locations: Docomo Shop Hofu (23 parking spaces), Docomo Shop Aeon Town Hofu, and Docomo Shop Yume Town Yamaguchi.
• Building Materials Division 2 — Environmental Construction Materials (建材第二事業部) Distribution and supply of environment-conscious construction materials for residential and commercial construction projects in Yamaguchi Prefecture.
• Architectural Materials Division (建築資材事業部) Distribution of architectural and building materials supporting aesthetic, structural, and finishing needs of construction projects.
• Information Systems Division — Office Solutions (情報システム事業部) Diverse office solution offerings with reliable usability for business customers, including IT infrastructure and systems support.
• Mobile Systems Division (モバイルシステム事業部) Distribution of communication equipment (communications devices) for business and residential customers.
• Integrated Disaster Prevention Project Office (総合防災プロジェクト室) Regional disaster prevention services including annual disaster preparedness seminars and community disaster fairs leveraging the company's LP gas infrastructure expertise.

Quantifiable outcome

• LP gas can achieve ~100% effective energy delivery to households vs. ~35% for electricity from power plants
• +2 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Nine partnerships are on record, tiered core, major and minor.

• NTT DoCoMo (NTTコミュニケーションズ)coreChannel Partner/ Reseller/ DistributorAuthorized NTT DoCoMo dealer operating three Docomo shops in Hōfu and Yamaguchi cities. Sells mobile devices, manages subscriptions, and hosts smartphone instruction classes. Includes exclusive Docomo shop operations and co-marketing events such as the '新生活応援フェア' with San-yu Busshi Division.
• Government agencies (国土交通省、山口県、市町村)coreStrategic or Co-development PartnerContracts with national, prefectural, and municipal government agencies for public infrastructure construction including traffic safety, slope protection, bridge maintenance, and tunnel repair. Bidding partner for government infrastructure projects in Yamaguchi Prefecture.
• Paloma (株式会社パロマ)majorChannel Partner/ Reseller/ DistributorAuthorized dealer for Paloma gas water heaters, built-in cooktops (パロマフェイシス, パロマウィズナ, パロマリプラ), and gas tables (パロマグランドシェフプレミアム, パロマエブリシェフ, パロマスタンダード). Products featured in 75th anniversary special product fair.
• Noritz (株式会社ノーリツ)majorChannel Partner/ Reseller/ DistributorAuthorized dealer for Noritz hybrid water heaters (ユコア — reducing energy costs by ~78%), premium water heaters, bathroom heating/ventilation dryers, gas fan heaters, and built-in cooktops (ノーリツプログレ, ノーリツピアットマルチ). Featured in 75th anniversary product fair with strong emphasis on energy efficiency.
• Rinnai (リンナイ株式会社)majorChannel Partner/ Reseller/ DistributorAuthorized dealer for Rinnai gas clothes dryer (乾太くん — customer satisfaction 120%, 2x sales growth in FY2021), featured in 75th anniversary fair. Products emphasized for speed drying and deodorization performance.
• Takara Standard (タカラスタンダード株式会社)majorChannel Partner/ Reseller/ DistributorMajor brand partner for system baths (グランスパ), washbasins, and system kitchens. Joint showroom events held at Takara Standard Shunan showroom. Featured in 75th anniversary fair and regular product promotion campaigns. Emphasizes enamel (ホーロー) material quality.
• TOTO (TOTO株式会社)majorChannel Partner/ Reseller/ DistributorAuthorized dealer for TOTO products including system bath (サザナ), toilet (ネオレスト, ピュアレスト), washbasin (オクターブライト), and system kitchen (ミッテ). Products featured in co-marketing with Docomo shops for new lifestyle campaigns.
• Panasonic (パナソニック株式会社)majorChannel Partner/ Reseller/ DistributorAuthorized dealer for Panasonic IH cooking heaters (B series), air conditioners (Mitsubishi Z series also handled), and refrigerators. Featured in 75th anniversary fair and regular product promotions. Also supplies commercial air purifiers (Sharp) through affiliated dealers.
• Hōfu City Fire Department (防府市消防本部)minorStrategic or Co-development PartnerCollaborates with Hōfu City Fire Department for the annual Autumn Gratitude Festival (秋の感謝祭), featuring fire truck exhibitions and safety demonstrations as part of community engagement activities.

Scale indicators4 records

Recent moves10 records

Expansion highlights6 records

Broad incumbents

• Osaka Gas Co., Ltd. Major Japanese gas utility offering city gas, LP gas, and integrated home services. Comparable business model to Sanyu's diversified gas + home services approach but at incumbent utility scale.
• Rinnai Corporation: Major Japanese gas appliance manufacturer producing water heaters, dryers, and cooktops. Sanyu is an authorized dealer; Rinnai's direct distribution and after-sales service network overlaps with the appliance installation business.
• TOTO Ltd. Japan's leading manufacturer of bathrooms, kitchens, and toilets. Although primarily a Sanyu supplier/partner, TOTO's direct-to-consumer showroom strategy overlaps with Sanyu's renovation and home equipment business.
• Tokyo Gas Co., Ltd. Japan's largest city gas utility with expanding LP gas and home services offerings. Overlaps with Sanyu in residential gas supply and home energy solutions but operates at vastly larger metropolitan scale.

Direct peers

• Gaster Co., Ltd. (株式会社ガスター): Specialized Japanese gas water heater and home gas equipment company. Comparable to Sanyu's gas water heater and home appliance distribution business, including system integration services.
• Nippon Gas Co., Ltd. (日本瓦斯 / Nichigas): Major residential LP gas supplier to Japanese households with bundled energy and home services. Highly comparable business model to Sanyu's recurring LP gas revenue stream combined with home appliance and renovation services.
• Iwatani Corporation: Japan's largest LP gas distributor with integrated energy, industrial gas, and home energy solutions. Direct comparable to Sanyu's LP gas distribution core business, though at substantially larger national scale, and shares the same disaster-resilient energy infrastructure positioning.
• ENEOS Globe: LP gas distribution subsidiary of ENEOS serving residential and commercial customers nationwide. Comparable in core LPG supply operations and customer-facing energy services.
• Astmos Retailing (アストモスリテイリング): LP gas retail company affiliated with ENEOS that supplies households and businesses across Japan. Direct peer in residential LP gas distribution and disaster-prevention positioning.

Others

• NTT DoCoMo: Parent carrier of the Docomo retail channel Sanyu operates. Although a customer/partner rather than competitor, NTT DoCoMo's dealer economics and channel strategy directly determine Sanyu's mobile retail revenue trajectory.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/profile.php
• LinkedInlinkedin.com/company/%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE%E4%B8%89%E5%8F%8B

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries8 records

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 株式会社三友