01257 262 683




Monday – Friday 08:00 – 17:00


Urmson LLP is part of the RJ Urmson Group. Key business activities are the commissioning, surveying, monitoring, and validation of HVAC and water systems. In addition, we offer independent witnessing testing, pressure balancing, and seasonal commissioning.

We offer a level of expertise that benefits a vast range of sectors including healthcare, education, offices, retail, manufacturing, commercial and residential buildings.

We are recruiting! Take a look at our latest career opportunities



Whatever your commissioning requirements are – commissioning of HVAC systems, surveying of buildings, independent witness testing and seasonal commissioning – contact us on 01257 262 683 to see how we can assist you or click below for further details:

Seasonal Commissioning

Our seasonal commissioning service is carried out by certified engineers who can recognise changes in the environment and tweak system performances to ensure all systems work correctly throughout the changing seasons

Commissioning of Domestic Water Systems

It’s a legal requirement under the water supply regulations 2009 that new water supply pipes are commissioned before they are connected to mains water services. Our commissioning involves flushing, swabbing and disinfection

Independent Witness Testing

Our independent witness testing service ensures that your HVAC equipment has been validated and calibrated to the optimum and that the system performance meets the design operational requirement

Pre-commissioning of HVAC

Benefits of pre-commissioning are to ensure the installation is per the contract design, identify issues prior to the commencement of testing, a cost effective way to remedy issues and reduce delays in commissioning and the overall project

Ductwork Leakage Testing

Leaky ducts can significantly increase energy bills, dramatically reduce system capacity and performance, as well as result in potentially dangerous indoor air quality problems. Our Tests are carried out to BESA DW/143 regulations

HVAC Building Surveys

HVAC system building survey is designed to investigate and optimise the design and performance of heating, ventilating and cooling systems. Research suggests that getting the right indoor climate improves productivity



“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

“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

“I have had the pleasure of working with Urmson LLP for that past 17 years carrying out a variety of commissioning projects and plant applications. From air flow balancing on commercial VRV projects to CHW mechanical flow rate testing and commissioning, their engineers integrate as part of our team and as a result it helps our business deliver the high standards our clients expect. Credit to their commissioning engineer, John who is consistently punctual, equipped and able to provide specific SSOW and always demonstrates a clear understanding of the works involved. Thank you.”

Jeremy Rolland, HVAC-R Project Manager | Integrated Air Conditioning


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