Costain Group
Senior Site Manager

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At CMDP+
We believe that people matter. We know that to build successful, creative teams we need a diverse workforce that can deliver new innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential.
CMDP+ is looking to strengthen their team with a Senior Site Manager for our Southern Water Framework. MWH Treatment and Costain Group are part of the CMDP+ joint venture that will deliver a range of construction schemes to maintain and improve Southern Water’s water supply and wastewater treatment works within the South and Southeast regions.
The Joint Venture has been set up specifically to execute the 5-year (2025 – 2030) AMP8 capital delivery framework. We will be delivering a programme of works up to £1bn over the 5-year period consisting of both heavy civil engineering and mechanical and electrical activities.
RESPONSIBILITIES
- Manage and coordinate site teams, subcontractors, and stakeholders.
- Coordinating all operational activities, ensuring the project is executed according to plans, specifications and compliant with health and safety regulations.
- Accountable for SHEQ (Safety, Health, Environment & Quality) performance of Projects, including undertaking and record findings of weekly SHEQ tours. Oversee the management of site based Supervisors, Delivery Teams and relevant areas of the supply chain.
- Liaison with the Client’s Operational staff to ensure Key Performance Parameters are met or exceeded.
- Compile and Collate final contract documentation, Safe to operate (STO), “As-built” drawings, test sheets, inspection & test plans etc. for inclusion into Operation & Maintenance Manuals and health and safety files.
- Input into works information with the commercial teams to ensure project scope is met in full or areas identified as requiring alternative contractor input.
- Seek out, highlight and promote products and working practices that actively reduce the carbon used on the projects you are involved.
- Monitoring work progress, ensuring quality standards are met, and resolving any issues or deviations from the project plan.
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.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
QUALIFICATIONS
Experience
- Knowledge and Experience in the water industry
- Commercial and Contractual understanding & awareness.
- Have knowledge and experience of working to a budget and programme
- Effective management of site team and sub-contractors.
- Excellent customer relationship skills
Qualifications
- To have a certificate in Site Management Safety Training Scheme (SMSTS)
- Relevant management CSCS card
- SEATS (Site Environmental Awareness Training Scheme) or approved Partner internal equivalent course attended
- 3 day First Aid at Work course inc. defibrillator
Desirable
- Degree, NVQ 6 or HND level qualifications
- Extensive experience in M&E/construction industry
- IOSH Modern COSHH Management Certificate
About Costain
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.
CMDP is a joint venture between Costain and MWHT and delivers a range of schemes to maintain and improve Southern Water’s water supply and wastewater treatment works in the eastern half of its region (Kent & Sussex).
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