Mechanical Engineer; HVAC & Legionella Qualified

CBRE Global Workplace Solutions is a leading global provider of integrated facilities and corporate real estate management. Our Critical Services teams protect the world's most demanding operational environments — from financial trading floors to Tier IV data centres — delivering zero-downtime engineering excellence around the clock.

We are recruiting a Critical Services Mechanical Engineer (HVAC & Legionella Qualified) to join our team in London. You will be responsible for the safe and compliant delivery of mechanical maintenance, air conditioning, ventilation, and water treatment works within a business-critical environment, operating under CBRE's Safe Systems of Work and in full compliance with statutory and industry regulations.

This role sits within the Critical and Technical Services job function. You will be a competent person under the Health and Safety at Work Act 1974, the Approved Code of Practice L8 (Legionella), and HTM 04-01 where applicable, with specific responsibilities for HVAC operation and water hygiene risk management.

• Carry out planned preventative maintenance (PPM) and reactive fault-finding on all mechanical plant including chilled water systems, cooling towers, AHUs, FCUs, split/VRF air conditioning, CRAC/CRAH units, pressurisation units, and associated BMS-controlled plant.
• Conduct, record, and report routine water hygiene monitoring activities including Legionella risk assessments, temperature monitoring (hot and cold water services), disinfection, TMV servicing, shower head cleaning, and sentinel outlet checks.
• Manage and administer contractor activities relating to water treatment, water hygiene sampling, and Legionella remediation, ensuring all works are documented and closed out in the CMMS.
• Diagnose and rectify faults across refrigerant-based systems (split, VRF/VRV, DX) and chilled water circuits; carry out pre-planned and emergency works in line with F-Gas Regulations 2014 (EU 517/2014, UK retained law).
• Issue and control Permits to Work (PTW) and mechanical isolation certificates in compliance with site-specific Safe Systems of Work (SSoW).
• Perform LOTO (Lock Out / Tag Out) procedures on mechanical plant and maintain an accurate isolation register.
• Maintain an up-to-date log of all work completed and outstanding items via the CMMS (e.g., Maximo / IBM Tririga / Service Now).
• Ensure all contractors and staff comply with CBRE, client, and statutory safety and security requirements; conduct contractor inductions and supervise high-risk activities.
• Participate in and support the Critical Services training programme including Water Hygiene, AP/CP Authorisation, and Emergency Procedures.
• Ensure effective communication with the client, management team, and helpdesk, escalating out-of-line situations with incident reports.
• Operate as an effective team member, sharing technical expertise to resolve operational problems and providing cover during holidays, training, and sickness.

• Mechanical Engineering (Essential):
  City & Guilds 6187 / NVQ Level 3 in Heating & Ventilating or Mechanical Engineering Services (or equivalent);
  City & Guilds 6189 or equivalent in Air Conditioning & Refrigeration (RAC) — Level 2 minimum (Level 3 desirable).
• F-Gas & Refrigeration (Essential):
  City & Guilds 2079 Category I F-Gas Certificate (or equivalent). Practical experience with split, VRF/VRV, DX, and chilled water systems.
• Water Hygiene & Legionella (Essential):
  City & Guilds 6017 / RSPH Level 2 Award in Legionella Awareness (HSE ACoP L8 compliant). RSPH Level 3 Award in Legionella Risk Assessment and Water Safety…