Costain Group
Site Agent

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Costain are working with Thames Water on a variety of water and wastewater projects and have fantastic opportunities for individuals to join our growing AMP8 delivery team, working predominantly across the Thames Valley and Thames South regions. There is a mix of projects ranging from smaller capital maintenance to large civil new build schemes.
The Site Agent will support the delivery of planned work across the Thames Water project and develop key relationships with operational personnel, supply chain partners and the wider delivery teams. The role will deliver multiple on-going projects to the specified quality, maximising commercial performance and maintaining high standards of health & safety and environmental impact.
This role will cover our Northleach and Marlborough sites, reporting into the Camberley office. This will be full time on site, with travel to multiple sites.
At Costain, we believe diverse perspectives drive innovation. If you’re passionate about making a positive impact and think you can bring value to our team, we’d love to hear from you—even if you don’t tick every box. Your unique skills and experiences could be exactly what we need.
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RESPONSIBILITIES
- Line management and development of site teams
- Ensure production and implementation of project plans, RAMs, ITPs and waste management
- Be responsible for robust and comprehensive site records (diaries, allocation sheets etc)
- Ensure supply chain remain compliant with the framework management plan
- Create a safety culture to strive toward zero LTI and RIDDOR incidents
- Maintain a commercial focus with a high level of challenge on project scope and choosing efficient delivery strategies
- Work closely with all project teams to ensure sites have suitably competent and skilled resources required to complete tasks
- Ensure delivery teams are engaged at operational level and supportive of the projects and services and their potential impacts
- Ensure consistent and reliable reporting of project SHE metrics, progress, cost, change etc.
- Ensure key project risks are identified early, and mitigated where possible
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
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QUALIFICATIONS
- Previous experience of working on multidisciplinary projects
- Experience working with MEICA interfaces and or in a water environment would be beneficial
- A team player who can develop good team working relationships and demonstrate collaborative behaviours
- Experience of managing and delivering projects (or packages of work within larger projects) safely to quality, time and budget
- Practical experience and familiarity of delivery to NEC forms of contract
- Ability to build trusted relationships with key stakeholders, within your team and across the operational sites
- Computer competence (standard Microsoft tools, document control system, Primavera software, etc)
- Good communication and interpersonal skills
- Full UK driving licence
- HNC/HND or degree in a relevant civil engineering discipline
- SMSTS qualification
- Relevant CSCS card
Costain helps to improve people’s lives with integrated, leading edge, smart infrastructure solutions across the UK’s energy, water, transportation and defence markets. We help our clients improve their business performance by increasing capacity, improving customer service, safeguarding security, enhancing resilience, decarbonising and delivering increased efficiency. Our vision is to be the UK’s leading smart infrastructure solutions company. We will achieve this by focusing on blue chip clients whose major spending plans are underpinned by strategic national needs, regulatory commitments, legislation or essential performance requirements. We offer our clients leading edge solutions that are digitally optimised through the following five services which cover the whole lifecycle of their assets: future-shaping strategic consultancy; consultancy and advisory; digital technology solutions; asset optimisation and complex programme delivery. Our culture and values underpin everything we do.


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Costain appreciate the time and effort taken when applying for one of our positions but, due to the high volume of responses, we are unable to provide individual feedback on candidates at application phase.
We do share individual feedback following an interview.
A Disability Confident employer will generally offer an interview to any applicant that disclose they have a disability and meets the minimum criteria for the job as defined by the employer.
It is important to note that in certain recruitment situations such as high-volume, seasonal and high-peak times, the employer may wish to limit the overall numbers of interviews offered to both disabled people and non-disabled people.
For more details please go to the Disability Confident website: https://www.gov.uk/government/collections/disability-confident-campaign
Costain are working with Thames Water on a variety of water and wastewater projects and have fantastic opportunities for individuals to join our growing AMP7 delivery team, working predominantly across the Thames Valley and Thames South regions. There is a mix of projects ranging from smaller capital maintenance to large civil new build schemes.
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