Diales Group Plc, together with its subsidiaries, provides various consultancy services to the engineering and construction industries. It offers quantum damages, delay analysis, project management, adjudicators, arbitrators, mediators; and technical expertise services, including civil, structural, mechanical, electrical, public health, and environmental engineering, as well as architecture and energy. The company offers commercial and contract; planning and programming; dispute resolution; structural design; pre-contract; quantity surveying; building information modeling for pre-construction, construction, and commissioning; and training services. Diales Plc serves building, transport and infrastructure, energy, process and industrial, oil and gas, shipbuilding and marine, and mining sectors. It operates in the United Kingdom, the United Arab Emirates, Netherlands, Germany, Australia, France, the United States, Singapore, South Korea, Italy, Saudi Arabia, Spain, Canada, Turkey, Sweden, Chile, Qatar, Ireland, South Africa, Oman, Ecuador, Peru, Belgium, Libya, and internationally. Diales Group Plc was formerly known as Diales Plc and changed its name to Diales Group Plc in March 2025. The company was founded in 1978 and is based in London, the United Kingdom.