What YMA does

YMA Co., Ltd. (株式会社ワイ・エム・エー) is a Japanese construction services company founded in 1991 and headquartered in Fujisawa, Kanagawa Prefecture. It operates from three offices — the Fujisawa headquarters, a Yokohama branch (established 2007), and a Tokyo sales office (opened 2023) — and employed 22 staff as of November 2025. The company delivers electrical equipment design, construction, and construction management services to major general contractors (大手ゼネコン), sub-contractors, condominium management associations, and public-sector facilities across the Tokyo-Kanagawa metropolitan area. In addition to its core electrical construction work, YMA has expanded into engineering services (hardware design through software development, launched August 2021) on a turnkey basis.

Beyond professional services, YMA has built a software and platform portfolio addressing the Japanese construction industry's DX needs. The flagship product, ONE Unit, is a cloud-based integrated business management system for construction firms launched in November 2023, bundling sales, construction, accounting, and employee management into a single workflow. Complementary offerings include CCUS代行申請サービス (a CCUS Construction Career Up System registration agency), Web Crewtto (a free website production/outsourcing service for construction firms), and 現場のWA！ (an industry networking event service). The company holds ISO 27001 (April 2024) and ISO 14001 (July 2025) certifications and is a member of the Japan Electrical Construction Association.

YMA's revenue model combines project-based fees from electrical construction contracts and engineering turnkey projects with nascent recurring revenue from ONE Unit SaaS subscriptions and CCUS agency services. Distribution is primarily direct through its three offices and inbound inquiries, supplemented by exhibition presence at construction DX events (Construction DX Expo Tokyo 2024 and 2025). The customer mix spans large enterprise general contractors, mid-market sub-contractors, and SMB construction firms, with a network of approximately 15 partner/subcontractor companies supporting project delivery. Pricing for software services is not publicly disclosed. Capital was increased to ¥20 million in 2024; no external venture capital or private equity investment is disclosed, indicating the company remains privately held by management/family.

Name

YMA

Legal name

株式会社ワイ・エム・エー

Website

https://yma.jp

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

11–50 employees

Short description

YMA is a Kanagawa-based Japanese construction firm founded in 1991 providing electrical equipment design, construction, and management services to general contractors, sub-contractors, and public clients in the Tokyo-Kanagawa region, complemented by its ONE Unit construction management SaaS.

Ownership category

akta.pro rank

Product category

Electrical Construction Services

NAICS

Power and Communication Line and Related Structures Construction (237130), Computer Systems Design Services (541512), Other Computer Related Services (541519)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), Water, Sewer, Pipeline, Comm & Power Line Construction (1623), Services-Computer Programming Services (7371)

akta.pro primary industry

Field Service Management (FSM) & Dispatch Platforms (HDAEALAM)

Keywords

• Electrical construction services
• Construction management software
• Engineering design services
• CCUS registration services
• Construction industry DX

Headquarters

HQ city

Fujisawa

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Electrical Construction Services: Design, construction, and construction management services for electrical equipment in public facilities, commercial buildings, hotels, and hospitals. Services provided primarily in Tokyo and Kanagawa areas to major general contractors and sub-contractors.
2. Engineering Services: Engineering services including hardware design from mechanical/electronics, manufacturing, software development, and turnkey services responding to various customer challenges and needs.
3. ONE Unit Software Sales: Sales of proprietary construction industry business management software system. Cloud-based system managing attendance, profit/loss, and operations.
4. CCUS Application Agent Service: Agency service handling Construction Career-Up System registrations for construction companies at low prices.
5. Web Crewtto Service: Free homepage production and full operation outsourcing for customers without website knowledge or resources.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

YMA fundamentally provides electrical equipment design, construction and construction management services to major general contractors, sub-contractors and public sector clients in the Tokyo and Kanagawa areas. In parallel it sells the in-house developed ONE Unit cloud-based business management system for construction companies, together with CCUS registration agency services, Web Crewtto website production/outsourcing and engineering design services spanning hardware and software.

Product overview

YMA operates as a multi-business company with two core segments: electrical equipment construction (design, construction, and dispatch services) and engineering services. The company has developed ONE Unit, a construction industry integrated business management system, which serves as the flagship software product alongside supporting services including CCUS registration assistance, website creation (Web Crewtto), and networking events (現場のWA！). The portfolio includes both hardware-related electrical work and software/cloud services for the construction industry's digital transformation.

Differentiator

Problem solved

Functional benefit

Brands

• ONE Unit: Construction industry integrated business management system developed by the company to solve fundamental problems and challenges in the industry.
• Web Crewtto
• CCUS代行申請サービス
• 現場のWA！

Products and services

• Electrical Equipment Construction Business (電気工事業) Design, construction and construction management services for electrical equipment in public facilities, commercial buildings, hotels, hospitals and residential buildings, provided primarily to major general contractors and sub-contractors in Tokyo and Kanagawa under YMA's special construction business license and registered electrical contractor status.
• Engineering Services Business (エンジニアリングサービス事業)

Quantifiable outcome

• Real-time integrated management from construction site to back-office operations
• +1 more outcomes

Named customers4 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered minor.

• 株式会社MCデータプラスminorOthersJoint use of personal information through MC Data Plus's construction industry cloud service '建没サイト・シリーズ'. YMA participates in joint handling of personal data as part of the service's data sharing arrangement.
• 一般財団法人建筑业振興基金minorOthersJoint use of personal information through the Construction Career-Up System (CCUS) operated by the Construction Industry Promotion Fund. YMA handles registrations as part of this system's data sharing arrangement.

Scale indicators4 records

Recent moves8 records

Expansion highlights7 records

Broad incumbents

• Kandenko: One of Japan's largest electrical construction contractors, serving the same end customers as YMA's electrical construction business but at vastly greater scale and with internal software capabilities.
• Kyudenko: Large electrical and facility construction firm primarily operating in Kyushu with national reach. Comparable to YMA's electrical construction services for commercial and public facilities.
• Kinden: Major Japanese electrical facility construction contractor with nationwide coverage. Competes with YMA's core electrical construction work for large general contractor assignments.

Direct peers

• Kensetsu System: Established Japanese vendor of construction management and accounting software for builders. Comparable to YMA's ONE Unit as a back-office SaaS for construction firms.
• Spider Plus: Construction DX platform specializing in field inspection, drawing management, and progress reporting. Spider Plus overlaps with ONE Unit's site-to-back-office integration thesis.
• ANDPAD: Japan's leading construction management SaaS platform. ANDPAD directly competes with YMA's ONE Unit across project, attendance, and back-office workflows for contractors and general contractors.
• KANNA: Construction DX SaaS targeting subcontractors and small-medium general contractors. KANNA is a direct competitor to ONE Unit, especially for daily site reporting and document management.

Emerging players

• Fukui Computer Architect: Provider of architectural CAD and construction management software widely used by Japanese builders. Comparable to YMA's use of Tfas CAD and to ONE Unit's design-to-management workflow.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 YMA