When you hire the W.J. O’Neil Company, you get a team. We are Project Estimators, Journeymen Pipefitters, Service Technicians, Project Foremen, Safety Engineers and more, all bound together by principles of integrity, quality, and excellence.

Established in 1983, W.J. O’Neil is a multi-faceted mechanical contractor specializing in industrial and commercial installations and service. With decades of experience and diverse skill sets, the company is united by a singular purpose: to exceed the expectations of our clients.

From the smallest service job to the largest construction project, we deliver quality work each and every time. Achieving customer satisfaction has solidified the company’s outstanding reputation in the Mechanical Contracting Industry.