OTB is renowned for its expertise and experience in tunnel, construction and geotechnical engineering, and rail assurance.

We are a specialist engineering consultant and designer that provides a wide range of design, assurance, management and advisory services.

Construction-minded, we deliver value at every stage of the project lifecycle. Practical and creative, we get it right, first time.

Tunnel Engineering
A recognised leader in the tunnel industry, OTB specialises in the design, construction and operation of tunnels and underground facilities. We have worked on the UK’s most important and challenging tunnelling projects as well as many worldwide.

Construction Engineering
We think like a contractor and excel at method-related design. Through the smart integration of permanent and temporary works we have introduced many new construction methods to promote project efficiency, reduce cost/risk and improve safety.

Geotechnical Engineering
Our expertise in geology and geotechnical engineering allows us to rapidly assess risk, identify opportunity and be highly confident of the engineering decisions we make. We are skilled in the design and deployment of ground and groundwater control measures.

Railway Assurance
We support railway operators, third-party developers and constructors to safely deliver capital works within the railway environment. We are expert in the planning, approval and management of works and the assessment and mitigation of impacts to protect existing assets and users.

Engineering Management
We offer a hands-on collaborative and functional approach to the stewardship of project delivery through engineering process from the front-end, through design, construction, commissioning and into use.