J.M. Brennan, Inc. Employee Directory

ConstructionWisconsin, United States201-500 Employees

J.M. Brennan, Inc. is a mechanical contracting firm based in Milwaukee, Wisconsin, offering a broad suite of services that covers high-performance HVAC, building controls, plumbing, process piping, industrial sheet metal, fire protection and monitoring, site utilities, and electrical work. The company combines engineering and sustainable design with around-the-clock service to support ongoing operations and project needs. Its customer base includes industrial, commercial, and healthcare facilities across Southern Wisconsin, with active work in Milwaukee and Madison. As a construction industry participant, it positions itself as a comprehensive provider capable of executing complex mechanical installations and ongoing maintenance across diverse facility types. The organization relies on a sizeable workforce of skilled trades professionals who perform pipe fitting, plumbing, sheet metal work, sprinkler systems, controls, service, and electrical tasks. A recent development is participation in Stratus Innovate 2025, where J.M. Brennan and PypeServer shared insights on fire protection fabrication.

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