Plumbing Contractors
Woman Owned and Operated
Providing Contracting Services
to The Chicagoland Area
Est. 1926
Tradition & Innovation
Why R.J. O'Neil
Is Right For You
Established in 1926, R.J. O’Neil has a strong sense of pride that characterizes our company. We have built a solid reputation as a high-quality service-oriented firm with a can-do team-oriented attitude. We work diligently to improve our products, processes, and services every day.
We provide quality HVAC-R, plumbing, and mechanical services to the municipal, industrial, commercial, and residential markets. Our can-do attitude, long history of service, and proven process for customer satisfaction builds lasting relationships with our clients, making R.J. O’Neil an unparalleled choice for all of your mechanical services.
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What We Offer
Plumbing Services
HVAC-R Services
Maintenance Packages
Mechanical Construction
Plumbing & Piping Services
HVAC-R Services
Maintenance Packages
Mechanical Construction
What Our Customers Think
Chicagoland contractor
Who We Serve
R.J. O’Neil is a mechanical contractor that has been serving the Chicagoland area for four generations. The company was established in 1926 and has since then gained a reputation for being a reliable and professional contractor. R.J. O’Neil specializes in quality workmanship and takes pride in its long-running history of providing skilled services to its clients. The company’s markets include residential, commercial, industrial, and municipal projects. R.J. O’Neil is dedicated to providing its clients with the best possible service and strives to be the leading contractor in the Chicagoland area.
About R.J. O'Neil
A full-service mechanical contracting firm, R.J. O’Neil specializes in process piping, plumbing, heating, air conditioning, and refrigeration. Offering complete mechanical services including systems design and layout, installation, maintenance and emergency repair. We also offer comprehensive maintenance programs for our commercial and industrial customers.