Company: COSTAIN GROUP
Location: Greater Manchester
Posted: April 11th, 2026
Job Description
Costain is expanding its Mechanical Design & Engineering Services to meet the increased engineering and design workload in the water sector, specifically for AMP 8 projects. We are currently seeking a Principal Mechanical Engineer – Water to join our team and support multiple clients, including United Utilities, Severn Trent, Thames Water, Southern Water, Northumbrian Water, and Yorkshire Water.
The position will be based at our offices on Aviator Way, Manchester, with a flexible approach to home working to promote wellbeing. We encourage applications from candidates with experience in the water sector, as well as those from other industries, to foster interdisciplinary learning and enhance on-site delivery.
This role presents an excellent opportunity to establish or advance a career in a technically challenging and rewarding sector that plays a crucial role in supporting the UK's water infrastructure.
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.
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. For more details please go to the Disability Confident website: https://www.gov.uk/government/collections/disability-confident-campaign
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