24/7 Emergency Service: (414) 342-3829

Mechanical Contractors in Milwaukee

J.M. Brennan, Inc. is located in Milwaukee, WI and proudly serves all of Southeastern Wisconsin. We’re your single-source mechanical contractor for HVAC, plumbing, process piping, controls, industrial sheet metal, and 24/7 service.

Why J.M. Brennan?

The craftsmen at J.M. Brennan understand the mechanics behind every component in your building. That’s why we’re able to offer solutions for even the most demanding projects. J.M. Brennan is the preferred mechanical contractor for hospitals, commercial buildings, universities, and manufacturing facilities.

Customer Focused

Our customer-driven approach is why we have been around for over 85 years.

24/7 Service

When you have a 911 call, we'll pick up the phone 24/7 to dispatch a technician.

High Quality Work

We build on a tradition of quality, workmanship, and superior value.

Dedicated Craftsmen

J.M. Brennan employs more than 375 talented, experienced tradespeople and skilled technicians.

Fleet of 130 Trucks

The green J.M. Brennan trucks make up the largest mechanical fleet in Milwaukee.

Proactive Solutions

J.M. Brennan knows your building's needs and will offer insightful solutions.


What We Do