Japan
Combining deep local expertise with global capabilities, Amentum delivers integrated engineering, infrastructure and operational solutions that help customers across Japan achieve safe, reliable and sustainable outcomes.
Operating in Japan since 1955, Amentum delivers integrated architecture and engineering, mission-critical infrastructure, operations and maintenance (O&M), facility management, and programme management solutions for customers across the defence, diplomatic, commercial, manufacturing, retail, hospitality and nuclear and critical infrastructure sectors.
From our Tokyo headquarters and regional operational presence throughout Japan, we combine multidisciplinary technical expertise with deep local execution capability to support complex projects and operational environments across the full asset lifecycle – from planning, architecture, design and engineering through operations, maintenance, modernisation and long-term sustainment. Our teams help customers operate safely, efficiently and sustainably in highly regulated and mission-critical environments.
Amentum’s nuclear expertise forms an important part of our presence in Japan. Since 2016, we have provided programme management support to Tokyo Electric Power Company (TEPCO) for the decommissioning of the Fukushima Daiichi nuclear power plant, drawing on our global experience in delivering solutions for complex, high-hazard environments.
Combining Japan-based technical expertise, bilingual project delivery, international and Japanese code knowledge, and Amentum’s global resources, we help clients successfully execute projects and sustain operations in complex and highly regulated environments.
Japan Employees
Japan Locations
Markets
Design and Facility Management
Defense and National Security
Nuclear Decommissioning and Waste Management
Cyber and Digital
Our Capabilities
Architecture and Engineering
Integrated architectural and engineering services supporting technically complex facilities and infrastructure projects throughout Japan, including commercial, manufacturing, hospitality, defense, and mission critical environments.
Amentum has a licensed First-Class Architectural and Engineering organization in Japan with more than 70 years of proven project delivery. We provide integrated architecture and engineering solutions, combining technical excellence with disciplined project management to deliver safe, compliant, and high-performance facilities.
Our in-house teams support every phase of delivery — from site investigation, planning, and design to cost estimating, construction administration, commissioning support, and criteria package development — helping clients complete complex projects on schedule, within budget, and to high quality standards.
Amentum’s multidisciplinary teams include architects, structural, mechanical, electrical, civil, and fire protection engineers, project managers, interior designers, cost estimators, and technical specialists. Our teams are fluent in both U.S. building codes and Japanese building law, supporting full compliance in complex and highly regulated environments.
With experience across military installations, diplomatic facilities, commercial workplaces, retail environments, hospitality projects, manufacturing facilities, and mission critical infrastructure, Amentum brings deep local execution capability and international technical standards to projects throughout Japan.
Amentum has completed more than 100 military projects in Japan and has supported diplomatic, government, commercial, and critical infrastructure clients across Japan and select Indo-Pacific locations.
Critical Infrastructure Solutions
Engineering and operational support solutions for resilient infrastructure, data centers, power monitoring systems, fire and life safety systems, and high-reliability technical environments
Amentum supports mission critical environments where operational continuity, resilience, and technical reliability are essential. Our teams provide integrated engineering, modernization, commissioning, and operational support solutions for high-reliability facilities throughout Japan.
Capabilities include data center infrastructure, power monitoring systems, resilient electrical infrastructure, VESDA fire detection systems, fire and life safety systems, communications environments, and technical facility modernization programs. Amentum also supports system assessments, code compliance reviews, surveys, testing, upgrades, maintenance, and operational risk reduction initiatives.
Our mission critical specialists work closely with architects, engineers, facility teams, and operations personnel to help clients improve reliability, safety, maintainability, and long-term facility performance within complex and highly regulated environments.
Amentum’s experience includes support for defense, diplomatic, manufacturing, commercial, and critical infrastructure clients requiring resilient technical systems and uninterrupted operational capability.
Facility Lifecycle Support
Integrated operations, maintenance, modernization, inspections, and technical support services helping clients sustain operational readiness, resilience, and long-term facility performance.
Amentum provides integrated facility lifecycle support services helping clients sustain operational readiness, resilience, safety, and long-term facility performance across complex operational environments.
Our teams support operations and maintenance programs, inspections, modernization initiatives, infrastructure sustainment, troubleshooting, emergency response, technical surveys, and facility support services throughout Japan. Services include support for commercial facilities, military installations, diplomatic environments, manufacturing sites, hospitality properties, and mission critical infrastructure.
Amentum combines engineering expertise with practical operational experience, allowing our teams to support facilities throughout the full operational lifecycle — from commissioning and occupancy through modernization, maintenance, and long-term sustainment.
Operating across highly regulated and operationally sensitive environments, Amentum emphasizes responsiveness, reliability, safety, and continuity of operations while supporting clients throughout Japan and select Indo-Pacific locations.
Nuclear Decommissioning and Waste Management
Amentum has been working at Fukushima Daiichi since 2016, supporting Tokyo Electric Power Company (TEPCO) with program and project management services, including long-term decommissioning strategy planning, management and implementation of supply chain resources, and program definition for fuel debris retrieval.
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Whether you’re planning a new project, seeking operational support or looking for a trusted partner in Japan, our team is ready to help.