EMCOR Group, Inc. provides electrical and mechanical construction, and facilities services primarily in the United States and the United Kingdom.

It offers design, integration, installation, start-up, operation, and maintenance services related to electrical power transmission, distribution, and generation systems; energy solutions; premises electrical and lighting systems; process instrumentation in the refining, chemical processing, and food processing industries; low-voltage systems, such as fire alarm, security, and process control systems; voice and data communications systems; roadway and transit lighting, signaling, and fiber optic lines; heating, ventilation, air conditioning, refrigeration, and geothermal solutions; clean-room process ventilation systems; fire protection and suppression systems; plumbing, process, and high-purity piping systems; controls and filtration systems; water and wastewater treatment systems; central plant heating and cooling systems; crane and rigging services; millwright services; and steel fabrication, erection, and welding services.

The company also provides building services that cover commercial and government site-based operations and maintenance; facility management, maintenance, and services; outage services to utilities and industrial plants; military base operations support services; mobile mechanical maintenance and services; services for indoor air quality; floor care and janitorial services; landscaping, lot sweeping, and snow removal services; vendor management and call center services; installation and support for building systems; program development, management, and maintenance for energy systems; technical consulting and diagnostic services; infrastructure and building projects; small modification and retrofit projects; and other building services.

It offers industrial services to oil, gas, and petrochemical industries. The company was incorporated in 1987 and is headquartered in Norwalk, Connecticut.