When our defence clients face high risk and complexity, Tetra Tech provides the technical solutions and consultancy to enhance their operational capability in thwarting emerging threats to national security.

Since the mid-90s, we have supported the UK’s armed forces in delivering some of the Ministry of Defence’s largest and most complex infrastructure and capability projects and programmes.

Our mission is to help clients achieve their mission through technologically enabled solutions driving improved performance. We achieve this with the expertise of our project managers, cost consultants, architects, engineers, asset managers, and environmentalist who work on diverse building and infrastructure projects, and programmes for organisational transformation, procurement, and equipment.

We have over 700 Suitably Qualified and Experienced People (SQEP) in the UK with security clearance to support classified projects. As part of Tetra Tech, our team in the UK is backed by global reach and innovative technologies in data analytics, defence information technology, munitions response, training, policy, and assessment, monitoring and evaluation.


As a Tier 1 Strategic Supplier to the Defence Infrastructure Organisation, we provide project management and multidisciplinary design services for developing and optimising the defence estate.

We work across all Front Line Commands and defence agencies with first-hand experience in Defence Lines of Development, linking operational capability, equipment, infrastructure, and organisational needs.

Global Reach

From Norway and the Falkland Islands, to Canada and Singapore, we have worked on UK and allied military estates around the world.

We have worked alongside 170 Engineer Group on Op HERRICK in Afghanistan, and we continue to deploy experts into theatres and training estates under our industry-leading Duty of Care platform.  We can deploy at short notice for any duration to undertake surveys and inspections or oversee long-term project delivery.

Security and IT

Our accredited IT systems enable us to work on classified projects and engage securely with our clients, providing confidence in the management and security of data and efficiency in delivery.

Award Winning

Our consistently high-quality performance has won us and our clients multiple awards with the Association for Project Management, the Institute for Collaborative Working, Royal Institute for Town Planning, and MOD Sanctuary (environmental) awards

Armed Forces Community

We are a champion of the Armed Forces. As an Employer Recognition Scheme Gold Award holder, we employ veterans and military spouses, recognising the significant value military experience, leadership, and teamwork brings to our organisation and our projects.

We were a proud sponsor of TeamUK on their journey to the Invictus Games 2021 and, are committed to supporting the Royal British Legion and other military charities.

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