We are a premier Mechanical Contracting company serving Connecticut and Western Massachusetts. We provide a wide range of comprehensive services for new or existing buildings' essential systems - Virtual Design & Construction, Engineering, Mechanical / HVAC, Fire Protection, Building Automation, and Service & Maintenance to support all. We deliver total system responsibility, effectively and efficiently, ensuring one-hundred percent customer satisfaction.

MJ Daly was founded in 1882 by Michael Joseph Daly as a small mechanical contracting firm using horse-drawn, wooden-wheeled trailers to deliver pipe and equipment to customers. Today, MJ Daly stands strong with decades of experience constructing and servicing buildings throughout Connecticut and Western Massachusetts. Our leading-edge approach in building information modeling (BIM), modular fabrication methodology, and integrated project delivery, provide MJ Daly a depth of expertise across a full range of system types.

MJ Daly provides complete fire protection solutions including fire detection, alarms, wet and dry sprinkler systems, clean agent suppression, and explosion protection technology. Whether your project needs are for new construction, retrofitting and upgrades, or design-build, we can design and install the right fire protection solution to protect your building and its occupants. Our complete fire protection systems include wet and dry pipe sprinklers, deluge systems, pre-action systems, standpipe systems, fire pumps, foam systems, Inergen and FM-200 systems, as well as above-ground water storage tanks and underground fire mains and hydrants.

MJ Daly's service and maintenance programs cover all our capabilities - Mechanical / HVAC, Fire Protection, Electrical, and Building Automation. Our proactive approach will help your building's or facility's efficiency, reduce operational costs, and prolong equipment life. Our service and planned maintenance programs will ensure that your essential systems are always up and running, providing maximum effectiveness. If an unexpected problem should occur, we are here for you with our 24-Hr Emergency Service 365 days a year.

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