Your Partner in Mechanical Solutions - Where Quality Meets Excellence
At J.M. Brennan, we pride ourselves on being a family-owned and operated mechanical contractor that has been serving Southeastern Wisconsin for over 85 years. Our commitment to customer satisfaction, quality workmanship, and superior value has allowed us to build a reputation as the most trusted mechanical contractor in the region.
Our Services
We offer a wide range of services to meet the unique needs of our clients. From design and engineering to construction and maintenance, we have the expertise and resources to handle all your mechanical contracting needs. Our services include:
- Design and Engineering: Our team of experienced engineers and designers use the latest technology to create innovative solutions for your building's mechanical needs.
- Building Information Modeling (BIM): Our BIM platform allows us to create detailed, 3D models of your building's mechanical systems, ensuring that every component is carefully planned and executed.
- Prefabrication: Our prefabrication services allow us to deliver high-quality, customized equipment components quickly and efficiently.
- New Construction: We specialize in new construction projects, from the ground up, ensuring that your building's mechanical systems are designed and installed to meet the highest standards.
- Remodels and Renovations: We understand that sometimes, changes are needed. Our team of experts can renovate or remodel existing mechanical systems to meet your changing needs.
- New Equipment Installations: Whether you need to install new HVAC systems, plumbing systems, or industrial sheet metal components, we have the expertise to get the job done efficiently and effectively.
- Custom Solutions: Our team works closely with clients to understand their unique needs and provides tailored solutions to meet those needs.
- Service and Maintenance: We offer on-site maintenance services, equipment replacement, and preventive maintenance to ensure your mechanical systems operate at optimal levels.
- 24/7 Emergency Service: In case of an emergency, our dedicated team of technicians is always available, ready to respond to your needs at a moment's notice.
Our Strengths
At J.M. Brennan, we take pride in our:
- Experienced Contractors: With over 92 years of combined industry experience, our team is committed to delivering exceptional results.
- Fleet of Trucks: Our fleet of trucks ensures that our technicians can quickly respond to emergencies and service calls.
- Proactive Solutions: We understand the importance of anticipating and resolving issues before they become major problems.
- Customer Focused Approach: As a family-owned and operated business, we prioritize customer satisfaction and take a personalized approach to understand our clients' unique needs.
Our History
Our story began in 1932 when John M. Brennan, Sr. founded J.M. Brennan, Inc. Over the years, our company has evolved, expanding its services and capabilities to meet the growing needs of our clients. Today, we are proud to be the leading mechanical contractor in Southeastern Wisconsin, with a reputation built on quality, workmanship, and customer satisfaction.
Join Our Team
If you're passionate about delivering exceptional results and committed to providing top-notch service, we'd love to hear from you. We offer a competitive benefits package, ongoing training and education, and a collaborative environment that fosters growth and development. To apply, please send your resume to Matt and John at mbrennan@jmbrennan.com and jbrennan@jmbrennan.com.
Stay Connected
Get the latest news and updates from J.M. Brennan by following our news section, where you'll find stories on our recent projects, company announcements, and industry insights.
General Experience
The reviewers have had mixed experiences with JM Brennan, ranging from very positive to very negative.
Positive Experiences
Many reviewers have praised the company's service, organization, and quality of work. They have mentioned that the company uses cutting-edge techniques, first-rate materials, and experienced professionals to deliver quality work on time and on budget. The staff has been described as friendly, helpful, and professional.
Negative Experiences
On the other hand, some reviewers have had negative experiences with the company's customer service, billing, and pricing. They have mentioned that the company's customer service is unresponsive, and they have been overcharged or received unclear bills. Some reviewers have also mentioned that the company's drivers have been reckless on the road.
Specific Issues
Some specific issues mentioned by reviewers include:
- Billing and Pricing: Reviewers have mentioned that the company's billing is unclear, and they have been overcharged.
- Customer Service: Reviewers have mentioned that the company's customer service is unresponsive, and they have been unable to get answers to their questions.
- Driving Habits: One reviewer mentioned that a van driver was using a cellphone while driving and almost caused an accident.

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