Assist

What Assist does

株式会社アシスト (Assist Co., Ltd.) is a privately held Japanese construction-support services company headquartered in Saitama Prefecture, founded in November 1990 with paid-in capital of ¥10,000,000 and 13 employees. It operates four integrated business units serving major Japanese general contractors (ゼネコン): a Multi-Skilled Worker division that supplies certified, multi-discipline civil engineering labor for railway and large-scale urban infrastructure projects; a Construction Management division staffed by former multi-skilled workers with 10+ years of field experience; a System/IT division offering network construction, server management, VPN setup, IT infrastructure leasing, and DX/ICT support for construction offices and sites; and a Materials Sales division distributing construction materials, tools, hardware, safety equipment, and seasonal products via direct sales and the shizai.co.jp materials site. Documented enterprise clients include Obayashi Corporation, Noguchi Kōmuten, Kishimoto Kensetsu, and Kida Gumi, with project references spanning Tokyo Station central line duplication, Shinjuku Station, Shinagawa Station, and other metropolitan-area railway works. In June 2026 the company added a patent-pending proprietary bear repellent spray product ("Kuma Icchimokusan," manufactured by Bio Science Co., Ltd.) targeted at construction sites in mountainous areas.

The company makes money primarily through project-based professional services fees for civil engineering labor and construction management, managed-services contracts for IT/network support at construction sites, and transaction-based mark-ups on construction materials and safety equipment sold directly to enterprise customers. Go-to-market is enterprise field sales driven by 20+ year trust-based relationships with major general contractors rather than broad marketing; pricing is quote-based and not publicly disclosed. Geographic operations are concentrated in the Tokyo metropolitan area and surrounding Kanto prefectures (Saitama, Kanagawa), with no disclosed international footprint. Revenue figures are not publicly disclosed and there is no record of external funding.

Name

Assist

Legal name

株式会社アシスト

Website

https://assist-tec.com

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

1–10 employees

Short description

Assist Co., Ltd. is a Saitama-based Japanese construction services firm, founded 1990, that supplies multi-skilled civil engineering labor, construction management, IT/network support, and materials sales to major general contractors on metropolitan railway and infrastructure projects.

Ownership category

akta.pro rank

Product category

Construction Services

NAICS

Other Heavy and Civil Engineering Construction (237990), Site Preparation Contractors (23891)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), Construction - Special Trade Contractors (1700)

akta.pro industry

PRIMARYBPACADAH

Civil, Construction & Infrastructure Engineering Staffing

Business & Public Services/HR, Staffing & Recruitment Services/Professional & Technical Staffing (IT/Engineering/Healthcare/Finance)

SECONDARYBPACAEAA

Construction & General Labor Staffing

Business & Public Services/HR, Staffing & Recruitment Services/Blue-Collar & Skilled Trades Staffing

SECONDARYTLABAFAH

Site Services & Temporary Infrastructure Rental/Leasing (Portable Toilets, Fencing, Storage Containers)

Transportation & Logistics/Fleet Leasing, Rental & Management/Construction & Industrial Equipment Rental/Leasing (Earthmoving, Material Handling, Aerial)

Keywords

• Civil engineering services
• Construction workforce solutions
• Construction project management
• Construction materials supply
• Construction site IT infrastructure

Headquarters

HQ city

Ageo

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Construction Project Services (建設工事事業): Civil engineering, railway infrastructure construction, and multi-skilled labor services. Revenue generated through project-based fees for construction work on major infrastructure projects including railway station expansions, elevated track work, and related civil engineering.
2. System & IT Services (システム事業): Network consulting, server management, VPN construction, IT infrastructure sales and leasing for construction sites. Provides comprehensive IT support for construction offices including security camera installation, file server management, and telecommunications.
3. Construction Materials Sales (資材販売事業): Sale of construction materials, hardware, tools, safety equipment, and seasonal/specialty products including the proprietary bear deterrent spray 'Kuma Icchimokusan'. Revenue from mark-up on procurement and direct sales to construction companies and site operators.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Assist Co., Ltd. provides integrated construction site support through four business divisions: (1) multi-skilled civil engineering labor for railway and urban infrastructure projects, (2) professional construction management services, (3) IT/network infrastructure and server management for construction offices, and (4) sales of construction materials, tools, and safety equipment including the proprietary bear repellent spray "Kuma Icchi Moku San." The company primarily serves major general contractors on large-scale railway and infrastructure projects in the Tokyo metropolitan area.

Product overview

Assist operates as a multi-department construction and IT services company with four core business units: Multi-Skilled Workers (多能工) for flexible workforce solutions in large-scale civil engineering and railway construction; Construction Management (施工管理) for professional project oversight; System/IT Services (システム) for network infrastructure, server management, VPN, and construction site IT solutions; and Materials Sales (資材販売) for construction supplies, tools, and safety equipment. The company also offers '熊一目散', a specialized bear repellant spray product for construction site safety in mountainous areas. Together, these departments provide comprehensive one-stop support for construction project execution.

Differentiator

Problem solved

Functional benefit

Brands

• 資材のらす.CO.JP: 建设仮設資材销售网站。会社官网底部链接至 shizai.co.jp。

Products and services

• Multi-Skilled Worker Services (多能工部門) Multi-skilled worker services providing flexible workforce for large-scale urban civil engineering and railway construction projects. Workers are trained in excavation, concrete work, formwork, rebar assembly, material handling, heavy equipment assistance, temporary facility installation, drainage work, and certified specialized tasks.
• Construction Management Services (施工管理部門) Professional construction management services for large-scale projects, including project planning, schedule management, quality control, safety education, progress monitoring, subcontractor coordination, inspection, documentation, and safety equipment management. Staffed by experienced former multi-skilled workers who transitioned into management roles.
• System/IT Services (システム部門) IT infrastructure and system services for construction sites and offices, including network construction and consulting, server management, VPN setup, system equipment sales and leasing, security solution proposal and implementation, and DX/ICT support for the construction industry.
• Materials Sales (資材販売部門) Sales of construction materials, equipment, tools, safety and security supplies, including temporary construction materials, hoses, piping, valves and fittings, lifting equipment, power tools, consumables, protective materials, track cleaning supplies, various tapes, and heat stroke prevention products.
• Kuma Icchi Moku San (熊一目散) Bear Repellent Spray Bear repellent spray for construction site safety in mountainous areas. Features a patent-pending unique valve design for intuitive operation during emergencies, 2%+ capsaicin concentration formula, and 1-year warranty. Target users include construction sites, surveying, infrastructure work, forestry, agriculture, and outdoor recreation.

Quantifiable outcome

• Established 35-year track record since 1990 with 13 employees — demonstrating efficient, high-quality service delivery on critical infrastructure
• +2 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles2 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 moderate and minor.

• コンドーテック株式会社 (Kondotect Co., Ltd.)moderateOthersMajor supplier of construction hardware, tools, and specialized equipment. Listed as a primary supplier for materials procurement, supporting the company's materials sales division and construction operations.
• トーアン株式会社 (Toan Co., Ltd.)moderateOthersListed as a primary supplier of construction materials and equipment. Supports the materials sales business unit with procurement and supply chain operations.
• 日本通商株式会社 (Nihon Tsusho Co., Ltd.)moderateOthersPrimary supplier of construction materials and general trading company partner. Contributes to the materials sales division's diverse product catalog.
• 株式会社五十嵐貞次商店 (Igarashi Teiji Shoten)moderateOthersLong-standing supplier of construction materials and equipment, supporting the materials sales business with specialized product sourcing.
• 株式会社フェニシス (Phenysis Co., Ltd.)minorOthersSupplier supporting the materials sales division's product range and procurement operations.
• キヤノンシステムアンドサポート株式会社 (Canon System and Support)moderateTechnology or IntegrationPrimary supplier for system equipment including multifunction printers and IT hardware. Supports the system department's IT infrastructure sales and leasing operations for construction sites.
• バイオ科学株式会社 (Bio Science Co., Ltd.)moderateOthersManufacturing partner for the proprietary bear deterrent spray 'Kuma Icchimokusan'. Produces the product under strict quality control standards, enabling the company to offer safety products to construction sites in mountainous areas.

Scale indicators4 records

Recent moves4 records

Expansion highlights2 records

Others

• Kanamoto Co., Ltd. カナモト is a leading Japanese construction equipment rental company; comparable to Assist's materials/equipment distribution side and to the broader equipment-supply ecosystem that Assist's site-services arm competes within.

Direct peers

• Tekken Corporation: 鉄建建設 is a Tokyo-based mid-tier civil engineering and railway construction contractor with substantial Tokyo-area station and track work — closely comparable to Assist's positioning as a multi-skilled civil engineering sub-contractor serving major general contractors and railway infrastructure projects.
• Raito Kogyo Co., Ltd. ライト工業 specializes in civil engineering sub-work such as earthwork, foundations, and slope stabilization — comparable to Assist's multi-skilled labor division and similar sub-contractor relationship with major prime contractors.
• Copro Holdings Co., Ltd. コプロ・ホールディングス is a construction technical staffing specialist providing engineers and skilled technicians to general contractors — comparable to Assist's multi-skilled workforce business serving major Japanese builders.
• Yume Shin Holdings Co., Ltd. 夢真ホールディングス dispatches construction engineers and skilled technicians to general contractors, mirroring Assist's core 'multi-skilled worker' staffing model for Japanese construction projects.
• Daitetsu Industries: 大鉄工業 is a railway-focused civil engineering contractor, comparable to Assist in its emphasis on railway infrastructure, mid-tier scale, and reliance on prime contractor relationships for Tokyo-area rail projects.

Broad incumbents

• Nippon Road Co., Ltd. 日本道路 is a large, established road paving and civil engineering contractor with overlapping heavy-civil capabilities but broader scope and larger scale than Assist's niche multi-skilled sub-contractor model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 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 Assist