Business Case WriterLondon, GB-GB, United KingdomProject Management
Sep 30, 2025 Post Date
Requisition #
We are seeking a skilled Project Manager with a specialisation in Business Case Writing, particularly experienced in utilising the Government Treasury Green Book. The successful candidate will play a pivotal role in preparing, refining, and updating Strategic, Outline and Full business cases that align with our clients’ objectives to support effective project delivery.
Reporting directly to our Director for Project & Cost Management, you will be responsible for managing projects and supported programmes, working closely with our clients, stakeholders and colleagues from other Tetra Tech disciplines.
Key Responsibilities
*Develop comprehensive business cases in accordance with the UK Treasury Green Book guidelines, providing clarity, coherence, and alignment with strategic objectives.
*Collaborate with stakeholders to gather requirements and insights, facilitating the preparation of robust project proposals.
*Conduct thorough evaluations of project benefits, costs, and risks, providing detailed analysis to support decision-making processes.
*Prepare and implement a range of project management tools, including risk registers, stakeholder management plans, and quality assurance plans.
*Monitor and report on project progress, ensuring adherence to timelines and budget constraints.
*Engage with senior client representatives to present business cases and secure necessary approvals.
*Foster a collaborative environment, working closely with multi-disciplinary teams to achieve project goals.
About you
*Proven experience in project management with a strong focus on business case writing and strategic planning.
*In-depth knowledge of the UK’s Treasury Green Book and its application in project development.
*Strong analytical skills with the ability to evaluate complex information and present it in a clear and concise manner.
*Excellent communication skills, capable of engaging with senior stakeholders and managing expectations effectively.
*A collaborative approach to working with diverse teams and clients, ensuring alignment and shared objectives.
*Professional and ethical in all dealings, demonstrating a commitment to delivering high-quality outcomes.
*Relevant qualifications in project management (e.g., APM, RICS) are preferred.
Requirements:
*Experience in managing projects within government bodies or related sectors is highly desirable.
*A strong understanding of financial management principles and their application in project delivery.
*Proficiency in Microsoft Office Suite, particularly Excel and Project, to support project planning and reporting.
*Willingness to travel as required for project engagements.
*You will be expected to work closely and interface with our Cost Management and Project Controls Team to drive opportunities for wider business development.
*Suitable for Security Clearance processing
About Tetra Tech:
Tetra Tech is a leading provider of high-end consulting and engineering services for projects worldwide. We combine the resources of a global, multibillion dollar company with local, client-focused delivery in more than 400 locations around the world. We are Leading with Science to provide sustainable and resilient solutions for our clients.
Tetra Tech is an equal opportunities employer and encourages applications from all suitably qualified and eligible candidates regardless of sex, race, disability, age, sexual orientation, transgender status, religion or belief, marital status, or pregnancy and maternity/shared parental leave, in line with the Equalities Act 2010.
We are very happy to discuss flexible working, including the possibility of reduced hours, flexible start and finish times, or compressed hours. We can offer a range of solutions to help you to get the most out of your work / life balance.

Additional Information
*Organization: 784 TCE