R.J. O'Neil Mechanical Contractors

About Us

R.J. O’Neil, Inc. is a Mechanical Contractor servicing the Greater Chicagoland Area. Established in 1926, we have decades of experience in HVAC-R, Plumbing, and Pipefitting. We specialize in maintenance, service, and installation across a variety of industries. We build relationships with the people driving your success: you, fellow tradespeople, our team, and our subcontractors.

Key Services:

*Turn-Key Construction Projects
* Preventative Maintenance Packages
* Installation & Service
- Plumbing
- Sewer
- Pipe
- HVAC
- Refrigeration
- Water & Waste Water Systems
- Process Piping
- Water Heaters

Expertise:

End-to-end solution for mechanical systems: from install to maintenance. Count on us to install, maintain and repair your mechanical systems for decades to come.

Markets Served:

* Healthcare
* Education
* Park Districts
* Industrial
* Retail Spaces
* Commercial Office Buildings
* Government
* Wastewater