Junior Pre-Commission Cleaning Engineer

Cts Ltd; City of London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A premier HVAC specialist in London is seeking a skilled Pre-Commission Cleaning Engineer to support HVAC system performance. Candidates should have 1–2 years of experience in water system cleaning or building services. Responsibilities include pre-commission cleaning, flushing, and system water quality testing. This entry-level role offers competitive salary, benefits, and opportunities for professional development within a growing team.

Benefits

Competitive salary

Certification support

Long-term progression opportunities

Qualifications

• 1–2 years relevant building services or flushing/cleaning work experience.
• Good understanding of LTHW/CHW system layouts preferred.
• Full driving licence required with willingness to travel.

Responsibilities

• Pre-commission cleaning of closed water systems.
• Flushing, dosing & filtration setup under supervision.
• Sampling, chemical treatment & system water quality testing.

Skills

Mechanical capability

Learning agility

Reliability

Job description

Commissioning Technical Services (CTS) is one of the UK's premier specialists in HVAC Commissioning, Commissioning Management, and Water Treatment. Based in London, we pride ourselves on our professional and high-quality service delivered by a team of highly trained and experienced professionals. We provide exceptional solutions to clients across the UK and internationally. Our focus is on efficiency, expertise, and client satisfaction in every project we undertake.

CTS is growing, and we are seeking skilled Pre-Commission Cleaning Engineers to support HVAC system performance across major commercial projects. If you're early in your building services career, we want to hear from you.

This job is ideal for candidates with 1–2 years' experience in water system cleaning or building services

London & Home Counties | Central England | West of England | Europe

What you’ll be doing:

• Pre-commission cleaning of closed water systems
• Flushing, dosing & filtration setup under supervision
• Sampling, chemical treatment & system water quality testing
• Interpreting method statements and system schematics
• Supporting senior engineers onsite and improving competency
• Preparing documentation and basic progress reports

Requirements:

• 1–2 years relevant building services or flushing/cleaning work
• Good understanding of LTHW/CHW system layouts preferred
• Keen to learn, reliable, mechanically capable
• Full driving licence + willingness to travel across regions

CTS offers:

• Full development into a competent Pre-Comm Engineer
• Certification support toward industry bodies (e.g. BESA / CSA / BSRIA / WMS)
• Exposure to commercial, data centre & large-plant installations
• Competitive salary, benefits & long-term progression
• Opportunity to move into commissioning, water treatment or TAB pathways

🚀 If you're ready to develop within Pre-Commission Cleaning — CTS would like to hear from you.

📩 Apply via LinkedIn or email your CV to [e-mail]

Seniority level

• Entry level

Employment type

• Full-time

Job function

• Engineering and Information Technology