Site Manager (Mechanical)

Site Manager (Mechanical) - Data Centre Project

📍 Stevenage 💰 £400 per day | Outside IR35 📅 Initial 4-Month Contract 🔒 SC Clearance Required

A fantastic opportunity has arisen for an experienced Site Manager to join a major data centre construction project in Stevenage, overseeing critical mechanical works on a fast-paced and technically challenging build.

We are looking for a hands-on Site Manager with strong mechanical knowledge and experience managing specialist building services installations. The successful candidate will take responsibility for key project activities including chiller installation, flushing, pressure testing, subcontractor management, quality assurance and health & safety compliance.

Key Responsibilities

Oversee mechanical installation activities across the project. Manage and coordinate chiller installation works. Supervise system flushing and pressure testing activities. Ensure works are delivered safely, on programme and to the required quality standards. Review RAMS, permits and site documentation. Coordinate subcontractors and maintain strong site standards. Monitor compliance with CDM Regulations and project-specific HSE requirements. Report progress and site performance to the wider project team.

Candidate Requirements

Proven experience working as a Site Manager on construction or engineering projects. Strong understanding of mechanical building services installations. Experience with chilled water systems, HVAC, flushing, pressure testing or commissioning activities. SMSTS and CSCS qualifications. Excellent health & safety awareness and site leadership skills.

Security Clearance

This role requires SC Clearance.

Candidates who do not currently hold SC Clearance are welcome to apply, provided they are eligible to obtain it. The application process typically takes 3-6 weeks.

Desirable Experience

Previous data centre experience would be highly advantageous; however, we are keen to speak with candidates from other highly regulated environments, including:

Life Sciences Pharmaceutical Nuclear Oil & Gas Advanced Manufacturing Other mission-critical facilities

What's on Offer?

✅ £400 per day ✅ Outside IR35 contract ✅ Initial 4-month duration with potential for extension ✅ Opportunity to work on a high-profile critical infrastructure project ✅ Immediate start available

If you're a mechanically biased Site Manager looking for your next contract opportunity and have experience delivering complex projects in highly regulated environments, we'd be delighted to hear from you.

To apply, please send your CV or contact us for a confidential discussion.

Please click to find out more about our Key Information Documents. Please note that the documents provided contain generic information. If we are successful in finding you an assignment, you will receive a Key Information Document which will be specific to the vendor set-up you have chosen and your placement.

To find out more about Progressive please visit

Progressive Recruitment, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales