John W. Danforth Company

ConstructionNew York, United States201-500 Employees

John W. Danforth Company is a Northeast-based mechanical contractor with roots dating back to 1884. Headquartered in Tonawanda, New York, it specializes in installing heating, ventilation, air conditioning, and plumbing systems and offers design-build services, custom sheet metal and pipe fabrication, energy performance contracting, and maintenance programs. The firm serves a range of facilities, including high-rises, hospitals, manufacturing plants, data centers, convention centers, and ski resorts, emphasizing engineered efficiency alongside construction.

As one of the region’s largest contractors, it provides integrated mechanical systems and ongoing maintenance to support mission-critical environments. In July 2025, the company announced plans to expand its footprint with a new office in Williston, Vermont.

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