Defence

Defence organisations today face unprecedented challenges: the need to strengthen resilience, modernise critical infrastructure, and deliver sustainable transformation, all while adapting to rapid technological change and complex regulatory demands. Tetra Tech understands these pressures and works alongside government, military, and industry clients to develop solutions that are agile, future-ready, and mission-focused.

Through our Leading with Science® consultancy and Tetra Tech Delta innovations, we bring together global expertise and advanced tools in digital engineering, environmental intelligence, and technical advisory. From estate optimisation and secure facilities to safety management, environmental services, engineering design, and operational support, we help clients solve complex problems, achieve Net Zero goals, and make informed, mission-critical decisions that build capability for the future.

Estate Strategy and Optimisation

We help defence clients optimise and manage their estate portfolios to align with operational requirements, regulatory compliance, and long-term strategic goals.

• Infrastructure strategy
• Masterplanning
• Estate condition assessments and surveys
• Strategic asset management
• Energy optimisation and carbon reduction
• Net Zero strategy development
• Facilities management procurement and support
• Estate disposal

Capital Projects and Programmes

We provide multidisciplinary expertise through the full life cycle of capital project scoping, design, procurement, and delivery.

• Requirements management
• Project initiation
• Budget management
• Options appraisal, business case, and procurement
• Architectural and engineering design and assurance
• Contract and commercial management
• Construction supervision
• Portfolio to Project Management Office delivery

Environmental and Sustainability Services

Our global specialists support defence clients in managing environmental impacts, regulatory compliance, and sustainable development across estates and equipment programmes.

• Environmental impact assessments
• Land quality assessment (LQA) and remediation
• Per- and polyfluoroalkyl substances (PFAS) management plans, equipment decontamination, site investigation, risk assessment, and remediation
• Ecology surveys and habitat management
• Environmental management plans, permitting, and monitoring
• Project Oriented Environmental Management System (POEMS) aligned environmental arguments and cases for equipment
• Environmental screening, scoping, review, and continuous improvement
• Best available techniques identification and implementation

Safety and Risk Management

We provide comprehensive safety expertise to support compliance across land, maritime, air, nuclear, and high-hazard defence environments.

• Safety management planning (SMP)
• Construction design and management (CDM) assurance
• Hazard identification, analysis, and management
• Safety arguments and safety cases
• Regulatory interface and support
• “As low as reasonably practical” (ALARP) demonstrations
• Human Factors assessment and design
• Nuclear site licence compliance

Secure Infrastructure and Mission Critical

We design and deliver complex, secure facilities that underpin critical national services and defence capability.

• High security facilities
• Blast resilience and chemical, biological, radiological, and nuclear (CBRN) design
• Nuclear and explosive licensed sites
• High-performance buildings and data centres
• Critical national infrastructure

Security Consultancy

We provide trusted security consultancy services to defence and government clients, helping safeguard infrastructure, assets, and operations from evolving threats.

• Threat, vulnerability, risk, and mitigation assessments (TARA, STaMP)
• Security strategies, policies, and guidance
• Site surveys and operational requirements
• Security assurance through all project life cycle design stages
• Security vetted workforce and onsite security supervision and material screening
• Cyber security risk management planning
• Security scope and system scope identification
• System-level security risk assessments and mitigation

Digital and Technical Advisory

We combine digital innovation with expert advisory to help defence organisations transform operations, enhance productivity, and make data-driven decisions.

• Building Information Modelling (BIM) and Geospatial solutions, including FusionMap
• Whole life cycle asset management capability and services (Asset Data Solutions)
• Digital project and portfolio management (myProjects)
• Transformation programmes and organisational design
• Technical standards, assurance, and independent design verifier
• Cost benchmarking
• Resource augmentation
• Project Academy training and development

Operational and UXO Support

We deliver deployed engineering, munitions response, humanitarian mine action, and unexploded ordnance (UXO) risk mitigation services to reduce operational risk, enhance safety, and support effective deployment in complex environments.

• Civilian engineering support teams
• Master planning and design of camp infrastructure and training estate
• Deployed management, supervision, and duty of care support
• Host nation standards and dual codes
• UXO risk assessments and desk studies
• Targeted geophysical surveys and risk modelling
• On-site UXO investigation and clearance
• Post-clearance verification and reporting