EMCOR provides construction, installation and maintenance services for the electrical and mechanical systems that keep buildings and industrial plants running. Its work includes wiring and power distribution, heating, ventilation and air-conditioning installation and retrofits, building automation and controls, plumbing and fire protection, and specialised industrial maintenance such as refinery and plant turnarounds.
Customers include operators of data centres and communications networks, hospitals, commercial landlords and tenants, schools and colleges, government bodies, hotels and entertainment venues, transport authorities, manufacturers, and water and wastewater utilities. The company earns revenue mainly from construction contracts for new installations and from ongoing service and maintenance agreements that cover repairs, retrofits and facility upkeep.
The business is organised into reportable segments: United States electrical construction and facilities services, United States mechanical construction and facilities services, United States building services, and United States industrial services. It also ran a United Kingdom building services segment until December 2025, when that operation was sold. Sales are now concentrated almost entirely in the United States. In February 2025 the company acquired Miller Electric Company, an electrical contractor, adding to its electrical construction capabilities.
Based on Emcor's 10-K filed February 26, 2026.