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


Our other 3 companies within the RJ Urmson Group are:

RJ Urmson Commissioning Engineers Limited
Core business activities are testing, cleaning, survey, installation, maintenance and service, and verification of ventilation systems and operating theatres

National Hygiene Services Limited
Core business activities are maintenance, survey, testing and treatment of commercial and domestic water systems including chlorination and legionella risk assessments

RJ Urmson Fire Specialists Limited
Core business activities are maintenance and service, survey, testing of fire systems including fire damper testing, fire compartmentation surveys and fire door inspections


  • Over 27 years of satisfied customers
  • Always have a personal point of contact
  • Full on-site service management
  • Bespoke service suited to your requirements
  • Ethical employers
  • National coverage
  • £10m Public, Products and Employer Liability Insurances
  • Nationally accredited Quality Management (ISO 9001)
  • We have an environmentally friendly approach to our services, in line with ISO 14001
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