Seiwa Kogyo

What Seiwa Kogyo does

Seiwa Kogyo Corporation (正和工業株式会社) is a privately held Japanese general construction and renovation firm founded in April 1963, headquartered in Adachi-ku, Tokyo with a Saitama regional headquarters and additional branches across the Kanto region (Toranomon, Machida, Tokorozawa), Kawasaki and Atsugi in Kanagawa, Osaka in Kansai, Fukuoka in Kyushu, and Taipei, Taiwan. The company operates the RENOXIA (リノシア) brand, delivering one-stop renovation services spanning architecture, equipment, and electrical engineering for factories, warehouses, office buildings, and logistics facilities, with stated cumulative experience of 20,000+ projects over 60+ years.

The firm's technical platform integrates in-house project management with a curated engineered-product stack, including the patent-pending PUT IN PUT OUT ventilation system for heatstroke prevention in large factory spaces, the Kubota-sourced large-airflow area air conditioner (20m reach, 130m3/min) distributed under an exclusive sales-agent agreement, GAINA ceramic coating, THERMO BARRIER heat-shielding sheets, Multi Aqua BCP water tanks, HEATSAFE heatstroke-prevention programs, and DECARBO decarbonization advisory. Service delivery is organized around three pillars: construction (interior, exterior, structural, exterior works), equipment (HVAC, plumbing, fire safety), and electrical (high-voltage, low-voltage, weak-current, energy creation/storage), enabling single-contractor accountability for complex industrial retrofits.

Revenue is generated through project-based professional services sold via enterprise field sales, on-site consultations, free estimates, and a content-driven inbound funnel (blog articles, downloadable service materials, SEO). The customer base is diversified across manufacturing, education, public/cultural venues, and media; reported outcomes include 25% running-cost reduction and a 5°C perceived-temperature improvement from HVAC optimization, and ~70% power-consumption reduction from LED conversions. The company employs 140 staff (consolidated) and maintains a materials center in Kasukabe, Saitama.

Name

Seiwa Kogyo

Legal name

正和工業株式会社

Website

https://renoxia.com

Company type

Private

Founded year

1963

Operating status

Operating

Short description

Seiwa Kogyo operates the RENOXIA brand, delivering one-stop renovation services for factories, warehouses, buildings, and logistics facilities across Japan and Taiwan through integrated architecture, equipment, and electrical engineering, with a curated engineered-product portfolio for heat, energy, and BCP solutions.

Ownership category

akta.pro rank

Product category

Commercial Renovation Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance (811310)

SIC

Misc Industrial & Commercial Machinery & Equipment (3590)

akta.pro primary industry

HVAC & Refrigeration Contracting (IMAFALAB)

akta.pro secondary industries

Refrigeration Systems Maintenance (Commercial/Industrial) (BPABACAI), Ventilation, Ducting & Air Distribution Equipment (IMAHAKAG), HVAC & Industrial Ventilation (Chillers, AHUs, Exhaust, Filtration) (EUAEAFAE)

Keywords

• Factory renovation
• Warehouse renovation
• Commercial building renovation
• HVAC installation
• Industrial construction

Headquarters

HQ city

Adachi-ku, Tokyo

HQ country

Japan

HQ region

Asia

Offices12 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Building Renovation Services: Comprehensive renovation services for factories, warehouses, buildings, and logistics facilities covering architecture, equipment, and electrical engineering. Revenue is generated through project-based professional services with one-time fees per project. Services include planning, design, construction, and after-maintenance support.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Seiwa Kogyo operates the RENOXIA (リノシア) brand, delivering one-stop renovation services for factories, warehouses, office buildings, and logistics facilities across Japan. The offering covers three engineering pillars—architecture, equipment (HVAC, plumbing, fire safety), and electrical (high/low voltage, weak current, renewable energy)—from planning and design through construction and after-maintenance. The company also distributes and installs specialized engineered products such as the Kubota Area Air Conditioner and proprietary systems including the patent-pending PUT IN PUT OUT ventilation system.

Product overview

Seiwa Kogyo operates primarily through its renovation brand RENOXIA（リノシア）, a one-stop comprehensive renovation service platform organized around three pillars: architecture (building/construction), equipment (HVAC, plumbing, fire safety), and electrical (high-voltage, low-voltage, weak-current, renewable energy) engineering. The platform serves factories, warehouses, office buildings, and logistics facilities across Saitama, Tokyo, and Fukuoka, offering services from planning and design through construction and after-maintenance. RENOXIA supplements its service offering with proprietary/engineered products including the Kubota-sourced エリア空調機 (large-airflow area air conditioner with 20m reach, model KBHP-ZP280-S) which RENOXIA distributes and installs, the Multi Aqua large-capacity water storage tank for BCP, the GAINA ceramic coating material, the THERMO BARRIER heat-shielding sheet (97% heat block), the patent-registered PUT IN PUT OUT ventilation/cooling system, スポットバズーカ spot cooling devices, HEATSAFE comprehensive heatstroke prevention systems, DECARBO decarbonization guidance, ceiling fans (シーリングファン), and zone air conditioning (ゾーン空調) systems. The platform's architecture is service-led, with engineered products positioned as differentiated solutions for specific customer needs (heat management, energy savings, BCP, decarbonization), all delivered through a single-point-of-contact, in-house project management model.

Differentiator

Problem solved

Functional benefit

Brands

• RENOXIA (リノシア): A renovation brand specializing in factory, warehouse, and building renovation services in Saitama, Tokyo, and Fukuoka. Provides one-stop renovation solutions including architecture, equipment, and electrical engineering.

Products and services

• RENOXIA Renovation Services (リノシア)

Quantifiable outcome

• Running cost reduction of 25%, improved perceived temperature by -5°C through air conditioning optimization
• +2 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

One partnership is on record.

• Kubota Air Conditioning Co., Ltd. (クボタ空調株式会社)coreTechnology or IntegrationRENOXIA serves as a sales agent for Kubota area air conditioning products, selling, maintaining, and providing comprehensive services for Kubota's large-volume area air conditioning units designed for factories and warehouses.

Scale indicators3 records

Recent moves3 records

Expansion highlights5 records

Broad incumbents

• Dai-Dan: Japanese MEP contractor focused on industrial HVAC, refrigeration, and clean-room systems. Highly comparable to Seiwa's area air-conditioning, refrigeration, and ventilation work for factories and warehouses, with deeper specialization in industrial process cooling.
• Takenaka Corporation: One of Japan's largest general contractors with deep capabilities in building construction, MEP, and energy retrofit for commercial/industrial facilities. Operates at substantially greater scale and broader scope than Seiwa but competes for the same large renovation project pipeline.
• Sanki Engineering: Large Japanese MEP/HVAC contractor serving industrial, commercial, and public facilities with installation, maintenance, and energy solutions. Directly comparable business model to Seiwa's RENOXIA in facility renovation and MEP contracting, but at much greater scale and national reach.
• Takasago Thermal Engineering: Japan's leading HVAC specialist contractor delivering industrial air-conditioning, clean rooms, and energy retrofit projects. Overlaps directly with Seiwa's factory/warehouse HVAC, ventilation, and energy-saving renovation offering, though at significantly larger scale.
• Shinryo Corporation: Established Japanese HVAC and clean-room engineering firm serving semiconductor, pharmaceutical, and industrial facilities. Comparable in the industrial HVAC/ventilation contracting space, with much larger scale and stronger presence in high-tech industrial segments.

Direct peers

• Kyudenko: Japan-based electrical and air-conditioning contractor serving commercial, industrial, and public facilities. Comparable to Seiwa's integrated MEP renovation work for factories and buildings, with stronger geographic coverage in Kyushu.
• Kandenko: Major Japanese electrical and facilities contractor delivering power, communications, and MEP solutions for buildings, factories, and infrastructure. Overlaps with Seiwa's electrical engineering pillar (high/low voltage, weak-current, renewables) and renovation project delivery.
• Toko Electrical Construction: Mid-sized Japanese electrical contractor specializing in building, factory, and power facility electrical work. Comparable to Seiwa's electrical engineering pillar, particularly for high/low voltage renovation projects in commercial and industrial facilities.
• Yurtec: Japanese facilities and electrical contractor serving commercial buildings, factories, and infrastructure with installation, maintenance, and energy services. Closely comparable business model to Seiwa's one-stop MEP renovation and after-maintenance offering.
• Mitsubishi Building Techno Service: Building facility management and renovation subsidiary of Mitsubishi Electric providing HVAC, electrical, and equipment maintenance services. Comparable in building/equipment renovation and after-maintenance scope, though more weighted to recurring facility management contracts.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

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 Seiwa Kogyo