About W.J. O’Neil

Built On A Foundation Of Customer Satisfaction

W.J. O’Neil Company is a leader in industrial and commercial installations and service. The W.J. O’Neil Company is customer-driven. Every aspect of our business — from our people to our service department to our fabricating shop — is designed with one goal: to exceed the expectations of our clients. It was a guiding principle when John O’Neil founded WJO over 35 years ago, and that commitment is even stronger today.


Established in 1983, W.J. O’Neil was founded on the belief that every one of our customers deserves outstanding quality and service. Because of these convictions, much of our new business is referrals from our satisfied clients. We design our projects to conserve energy, and strengthen the economies of the communities where we work and live.


From the smallest service job to the largest construction project, we deliver quality work each and every time. Achieving 100% customer satisfaction is why we have an excellent reputation in the Mechanical Contracting Industry.


The W.J. O’Neil Company is a team of specialists united by a single purpose: to exceed the expectations of our clients. We are Project Estimators, Journeymen Pipefitters, Service Technicians, Project Foremen, Safety Engineers and more, bound together by principles of integrity, quality, and excellence.

At W.J. O’Neil, safety is more than a company goal;

it’s a requirement.

From front office managers to field employees, safety is always first. We were one of the first in the industry to establish an effective Safety Program to prevent potential hazards from occurring at the work environment.

We conduct regular training seminars, safety meetings, toolbox talks, site inspections, and pre-task planning. Safety issues include: fire prevention, excavations, welding and burning, industrial hygiene, occupational health, motorized vehicles and mechanized equipment.

Our Safety Protection Program and the Accident Prevention Program exceed MIOSHA requirements and are mandatory for WJ O’Neil employees. This up-to-date training makes our staff and personnel as knowledgeable as possible about some of the potential hazards that can occur within the job site.

Dependable 24-Hour Service

Our 24-hour emergency service means we’re always there for you, day or night. That means no downtime costs because of faulty equipment and lack of maintenance. Plus, our emergency service gives you peace of mind knowing that our technicians can handle any mechanical problems, anytime.

LEED Certification

Our highly skilled LEED Accredited Professionals know all the latest green building practices and LEED requirements and processes. LEED certification provides third-party verification that a building or community was designed and built using strategies aimed at improving performance across all the metrics that mater most.

GreenStar Designation

W.J. O’Neil was one of the first 30 contractors in the country to be honored with GreenStar designation awarded by the Mechanical Service Contractors of America (MSCA) for meeting stringent guidelines for environmental responsibility.

Building Green

Setting a Higher Standard

W.J. O’Neil is a leader in green building. We help clients safeguard the environment, conserve energy, and strengthen the economies and social structures of communities. Our commitment to environmental sustainability began in the last century, and we continue to be a leader in green technology in the 21st century.

In fact, sustainability is integral to every aspect of W.J. O’Neil’s operation. Conducting business in a socially, economically, and environmentally responsible manner, is a mandate on every one of our projects.

Leadership in sustainability is more than a responsibility at WJO; it is an obligation, a privilege, and an honor.

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