Job Vacancy: Mechanical Site Supervisor

Job Title: Mechanical Site Supervisor

Location: Cardiff (including other sites across Wales and England)

Contract: Full Time

Hours of work: Monday – Friday 7:30am to 5:00pm

Salary: Competitive Hourly Rate, based on experience

THE COMPANY

CMB Engineering is one of the UK's largest independent Building Services Contractors in England and Wales. At CMB Engineering, personality and drive are key characteristics for a high performing team member. The business was formed in 1992 and since CMB began it has established itself as a ‘no grief’ partner to national blue chip construction firms.

THE JOB

We are seeking an experienced Mechanical Site Supervisor to oversee HVAC installation works across our active construction projects.

This is a key site-based role, ensuring all mechanical activities are delivered safely, efficiently, and to the highest quality standards. The ideal candidate will have strong technical expertise in HVAC systems, excellent leadership skills, and the ability to coordinate subcontractors and site operations effectively.

This is an excellent opportunity for a Mechanical Site Supervisor looking to work on varied projects within a professional and safety-focused environment. If this seems like something that would interest you, please get in touch.

DUTIES & RESPONSIBILITIES

• Supervise and manage day-to-day site operatives for HVAC installation on site.

• Manage and coordinate subcontractors and direct labour.

• Ensure compliance with health and safety regulations and company policies.

• Interpret mechanical drawings and specifications.

• Monitor project progress and provide digital reports to Project Managers.

• Maintain site documentation electronically.

• Conduct site inspections to maintain quality, compliance, and safety standards.

• Coordinate deliveries, materials and site logistics.

• Attend site meetings and liaise with clients and main contractors.

• Review drawings, specifications, programme of works and RAMS.

• Assist with resolving technical issues and on-site challenges.

• Monitor material usage and support procurement where necessary.

WHAT WE ARE LOOKING FOR

• Proven experience in HVAC installation and supervision

• Strong knowledge of mechanical building services systems

• Ability to read and interpret technical drawings

• Excellent communication and leadership skills

• Strong understanding of health and safety regulations

• Basic IT skills and confidence using a Laptop for emails, reporting, and documentation

• Relevant trade qualification in Mechanical / HVAC Sector

• SSSTS / SMSTS Preferred

• Valid CSCS Card

• Full UK Driving Licence

DESIRABLE / BENEFICIAL

• First Aid Qualified

• Experience using Microsoft Office (Word, Excel, Outlook) or project management software

WHAT WE OFFER

• Competitive hourly rate (dependent on experience)

• Company Pension Scheme

• Statutory holiday entitlements plus bank holidays

• Ongoing training and development

• Opportunity to work on high-profile projects

• Career progression within a growing company

• Full caseload, supported by a strong order book

If you are interested in applying for this role, please send a copy of your CV to Jason Oliver via email to careers@cmbeng.co.uk  

Closing Date for CV’s: Friday 10^th April 2026 at 5:00pm

Date for Interviews: W/C Monday 20^th April 2026

Please Note: Due to the overwhelming number of applications we receive, we may only contact candidates who have been shortlisted for an interview.

We reserve the right to close this vacancy early if the demand in applications become high.

We do not require assistance from recruitment agencies.

CMB Engineering is an Equal Opportunities Employer.