Costain Group PLC
Site Manager
How your CV stacks up
Upload your CV to see how well it fits this job role
?%
Site Manager – CMDP+ Joint Venture (AMP8 Capital Delivery Programme)
About the Role
At CMDP+, we believe that people matter. We know that to build successful, creative teams, we need a diverse workforce that can deliver innovative ways of thinking. We provide an environment where you can develop and grow to your full potential.
MWH Treatment & Costain Group are part of the CMDP+ joint venture, responsible for delivering a range of construction schemes to maintain and improve Southern Water’s water supply and wastewater treatment works in the South and Southeast regions.
The Joint Venture has been established to execute the 5-year (2025–2030) AMP8 capital delivery framework, delivering a £1bn programme of works over five years. Projects span heavy civil engineering and mechanical & electrical activities.
As Site Manager, you will oversee the project from start to finish, ensuring it is completed on time, on budget, and to quality standards, while prioritising safety for everyone on site.
At Costain, we believe diverse perspectives drive innovation. If you’re passionate about making a positive impact and think you can add value to our team—even if you don’t tick every box—we’d love to hear from you. Your unique skills and experiences could be exactly what we need.
Responsibilities
- Manage and coordinate site teams, subcontractors, and stakeholders
- Coordinate all operational activities, ensuring projects align with plans, specifications, and health & safety regulations
- Accountable for SHEQ (Safety, Health, Environment & Quality) performance, including weekly SHEQ tours
- Oversee the management of site Supervisors, Delivery Teams, and supply chain
- Liaise with Client’s Operational staff to meet Key Performance Parameters
- Compile final contract documentation, Safe to Operate (STO) reports, as-built drawings, test sheets, inspection & test plans, and integrate these into Operation & Maintenance Manuals
- Work with commercial teams to ensure project scope is delivered in full or identify areas needing alternative contractor input
- Identify and promote low-carbon products and practices on projects
- Monitor work progress, ensuring quality standards, and resolving deviations from the project plan
Reasons to use Rodeo
Start with a chat, not a search bar
Grad scheme, placement, apprenticeship? Not sure what you want yet — that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.
It searches the market for you
Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.
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.
Essential Knowledge, Skills & Experience
- Water industry knowledge and experience
- Commercial and contractual awareness
- Experience managing projects to budget and programme
- Effective site team and subcontractor management
- Strong customer relationship skills
Desirable Qualifications & Experience
- Degree in Civil Engineering
- CITB Temporary Works Coordinator Certification
Essential Qualifications
- Site Management Safety Training Scheme (SMSTS) Certificate
- Valid CSCS Manager Card (relevant to the role)
- SEATS (Site Environmental Awareness Training Scheme) or approved Partner equivalent
- 3-day First Aid at Work (including defibrillation training)
Desirable Qualifications
- Degree, NVQ Level 6, or HND in a relevant discipline
- Extensive experience in M&E/construction sectors
- IOSH Modern COSHH Management Certificate
About Us
Costain helps improve people’s lives by delivering smart infrastructure solutions across energy, water, transportation, and defence in the UK.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
We help clients enhance business performance by:
- Increasing capacity
- Improving customer service
- Safeguarding security
- Enhancing resilience
- Decarbonising
- Delivering efficiency
Our vision is to be the UK’s leading smart infrastructure solutions company. This is achieved by focusing on blue-chip clients whose strategic needs drive major investment projects. We offer a lifecycle approach to assets through: ✔ Future-shaping strategy ✔ Consultancy & advisory ✔ Digital technology solutions ✔ Asset optimisation ✔ Complex programme delivery
Our culture and values underpin everything we do.
Additional Information
We appreciate the effort of all applicants but, due to high response volumes, we are unable to provide individual feedback at the application stage. Interview feedback will be shared following an interview.
Costain operates as a Disability Confident employer. Interviews are offered to any applicant self-identifying as disabled who meets the minimum criteria for the role.
Note: During peak recruitment periods (high-volume, seasonal), the employer may need to limit the overall number of interviews across all applicants, disabled and non-disabled.
For more details, visit the [Disability Confident website](https://www.gov.uk/government/collections/disability-confident-campaign).
About the Team
CMDP+ is a collaboration between Costain and MWHT, focused on delivering construction schemes to support Southern Water’s water supply and wastewater treatment works in Kent & Sussex.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
Skills