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Monday – Friday 08:00 – 17:00

RJ Urmson Commissioning Engineers Ltd is part of the RJ Urmson Group. Our core business activities are operating theatre and critical ventilation verification’s and testing of LEVs, fume cupboards and biological safety cabinets.

We offer a level of expertise that benefits a vast range of sectors including NHS, private healthcare, operating theatres, education, pharmaceuticals, retail, manufacturing, commercial and residential buildings.

Furthermore, we also carry out mechanical and electrical design reviews, deliver turnkey and clerk of works projects for the building services sector.

Operating Theatre

Quality Guarantee

Quality is paramount in what we do. Our engineers carry out all ventilation services to meet the requirements of industry set regulations and guidelines

Why choose us?

Over 30 years of satisfied customers, bespoke service suited to your requirements, national coverage, fully insured and nationally accredited Quality Management System ISO 9001:2015

Our values

We have three core values that inform our behaviour and approach to work: to Excel, Challenge and Inspire

We Are Recruiting! Take A Look At Our Latest Career Opportunities

What services do we offer?

Whatever your ventilation service requirements are – design reviews, turnkey projects, testing, cleaning, surveys, installations, maintenance and verifications of ventilation systems and operating theatres – contact us on 01257 262 683 to see how we can assist you or click below for further details:

Work & Projects

  • HTM 03-01 Standard Operating Theatre Verification I An annual operating theatre verification must be undertaken in accordance with HTM 03-01

  • RJ Urmson can provide a Clerks of Works to represent the interests of the client in regard to ensuring that the quality of the works are in accordance with the design information, specification and engineering drawings, and in addition to appropriate recognised cleanroom / aseptic standards

  • FACT: More than 1,000 systems balanced last year A balanced ventilation system will introduce fresh air into the building at the same rate ...

  • Our operating theatre installation team have been involved in designing and building operating theatres for the NHS and private healthcare sectors since 1992. We ...

  • Fact: More than 1,000 replacement HEPA filters supplied and fitted last year High Efficiency Particulate Air (HEPA) filters are designed to remove airborne ...

  • Particle counting and microbiological air sampling are used in cleanrooms to count and size the particles in the air so the cleanroom stays function ...

  • Fact: 9,657 microbiological safety cabinets serviced and commissioned and counting Microbiological Safety Cabinets (MSC), also called Biological Safety Cabinets (BSC) are laboratory ventilated enclosures most ...

  • Microbiological air sampling is usually undertaken to assess air quality in areas such as operating theatres, pharmacy aseptic units /clean rooms, treatment rooms and such ...

  • Fact: More Than 7000 HEPA Filters Tested Last Year HEPA filters are designed to filter airborne fine particulate (dust), pollen and aerosols from the air, ...

  • Fact: More than 150 cleanrooms verified in 2017 Cleanrooms are used in practically every industry where small particles can adversely affect the manufacturing process. Air ...

  • Fact: 11,527 miles of ductwork cleaned and counting Pharmacy aseptic units are used to prepare treatments in an environment that is free from bacteria. ...

  • A fume cupboard is a means of containing or extracting hazardous fumes, vapours and aerosols away from the operator to be safely discharged to the ...


“ADT Energy has taken great pleasure in contracting RJ Urmson Group in a number of applications of varying sizes. RJ Urmson Group have been very accommodating with all of ADT’s requirements and requests. Detailed certification and documentation for works carried out have always been issued promptly. Their engineers have always conducted themselves in a friendly and professional manor and their workmanship is of the highest standard. I would happily recommend RJ Urmson Group to any potential client requiring their services”

James Roxburgh
Project Manager
ADT Energy

“I have had a good working relationship with RJ Urmson Group over the past 7 years whilst working at North Lincolnshire and Goole Hospitals NHS Foundation Trust and Doncaster and Bassetlaw Teaching Hospitals NHS Foundation Trust. They hold maintenance and service contracts for theatre ventilation including verification of ultra clean systems and smoke damper survey and testing. I find them very flexible in their approach, working with agreed times to avoid any disruption to services. Supplying comprehensive reports that are easy to read with detailed feedback on identified issues helps us to target spend on areas before serious problems occur”

R Holdridge
Head of Operational Estate, BDGH
Doncaster and Bassetlaw Teaching Hospitals NHS Foundation Trust

“Due to programme constraints, a number of other factors it were always going to be a challenging project, and it’s been a huge achievement to get to where we are at. Kirk and his guys came into a pressurised situation but still managed to put in as much effort as possible and carried out their works to an extremely high standard which was also noticed by the clients’ consultant when the witnessing was carried out without any issues. Arthur McKay & ISG really appreciate the efforts Urmson LLP put in, as it helped push the job across the line”

Martin Kerr
Project Manager
Arthur McKay Building Support Services

Interested? Get in touch for a quote!

RJ Urmson Group Accreditations