Mechanical Engineer - HVAC

Lead Mechanical Building Services Engineer

Location: Central London (Whitehall)

Position Type: Permanent, Full-time (40 hours/week, Mon–Fri)

Are you an experienced Mechanical Engineer with a strong background in building services and critical infrastructure?

We are currently recruiting for an established delivery partner to lead mechanical engineering operations across a high-profile, mission-critical estate in Central London. This is a technical leadership role offering full ownership of complex mechanical building services within a secure, compliance-driven government environment.

The Role

As the lead mechanical authority on-site, you will combine hands-on operational maintenance with project delivery . You will take responsibility for ensuring system reliability across a mix of modern and legacy infrastructure, managing critical plant, and driving compliance standards in an environment where zero-downtime is essential.

Key Requirements

• Proven background in mechanical engineering within building services, facilities management, or critical infrastructure (e.g., defence, healthcare, data centres).
• Strong hands-on experience maintaining HVAC systems, pumps, valves, pipework, and water hygiene systems.
• Practical knowledge of diagnosing faults and extending the lifecycle of legacy mechanical plant.
• Deep understanding of statutory compliance and safe working practices.
• Ex-military engineers (Royal Navy, British Army, Royal Marines, RAF) with relevant mechanical building services or marine engineering experience are strongly encouraged to apply.

Security Requirements

• Candidates must be sole UK nationals eligible for Developed Vetting (DV) clearance.
• Candidates can commence the role with Security Check (SC) clearance while undergoing the DV clearance process.

Key Responsibilities

• Take technical ownership of all mechanical systems, PPM delivery, and reactive maintenance across the estate.
• Diagnose complex faults and perform hands-on troubleshooting across HVAC systems, chillers, AHUs, pressurisation, water hygiene, and fuel storage plant.
• Manage, maintain, and upgrade ageing or legacy mechanical infrastructure to ensure continuous reliability.
• Ensure full compliance with statutory regulations, safe systems of work, and health and safety standards.
• Oversee specialist sub-contractors for both routine maintenance and project delivery.
• Produce technical specifications, reports, and scope-of-work documents for remedial works and system upgrades.

To Apply

If you are a technical engineer looking to take ownership of a prestigious estate, submit your CV to discuss the role in confidence.