Who are CBG?

We are an ambitious practice of building services consultants, Investors in People accredited, with offices located in Oxford, London, Manchester and Cambridge, covering a wide range of mechanical and electrical engineering solutions specialising in sustainability, building physics and Passivhaus. In 2023, we established a new lighting consultancy division with the acquisition of Light Perceptions Ltd, so that we can offer our clients a more comprehensive service.

We specialise in maximising the efficiency of buildings, through optimising fabric with efficient mechanical and electrical design solutions. With over 50 staff, we are one of the largest independent sustainability led M&E practices in the UK, covering masterplans, new build, extension, fit-out, refurbishment and asset maintenance in all sectors.

Our vision is to be a leading consultancy delivering excellence in building physics and engineering for better buildings that benefit their occupants and the environment.


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"This complex project was successfully completed to a demanding time deadline. The scheme was delivered to budget to extremely high standards. We are delighted with the facility in terms of overall appearance, the facilities provided and ongoing energy savings. CBG provided excellent support throughout the design stage, implementation and during a “soft landing” when the project was handed over." Senior Assistant Registrar, Department of Chemistry, University of Warwick, Chemistry Department