TClarke plc, together with its subsidiaries, engages in the design, installation, integration, and maintenance of the mechanical and electrical systems and technologies in the United Kingdom. The company also provides mechanical and electrical contracting and related services to the construction industry and end users; and ICT services. In addition, it offers technology solutions in the areas of data centers, IT infrastructures and networks, AV systems, fire systems, alarm and security systems, smart buildings, and offsite manufacture and prefabrication. Further, the company provides services in the areas of underground and over ground rails, civil and defense airports, healthcare, hospitals and research, schools and universities, and prison and defense projects; and residential, new build, hotels, refurbishment, and student accommodations. Additionally, it offers facilities management services; and engineering services for commercial offices, retails, leisure and stadiums, museum and galleries, and buildings. The company was founded in 1889 and is headquartered in London, the United Kingdom.