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Best in class company & people

Established in 1925, W.E. O’Neil Construction has flourished into an award-winning and nationally ranked industry leader. Our foundation is rooted in our people and our commitment to quality, integrity, and responsiveness to our clients’ needs.
Through four generations of family leadership and nearly 100 years of experience, the O’Neil name has been synonymous with quality professional construction services.

Our Approach

Providing quality service to our customers is our number one priority. Our goal is to be your strategic partner and advocate, not just your contractor. Our relentless commitment to quality is an integral part of our values and technological systems. We first understand your unique needs and expectations, then work with the team to provide innovative tailored solutions.

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In Good Company

We exist to help our clients and partners build their dreams. At the link below, view more of our valued customers as well as what they have to say about partnering with W.E. O'Neil.

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By The Numbers

Year founded by William E. O'Neil
Annual Revenue
Employee Owners
Our leadership have been with W.E. O’Neil for at least 15 years
Senior leadership team's average years in industry
Offices across the U.S., with focus on smart growth
Repeat Business
States we've built in

What sets us apart


  • 01

    We Are Relationship Builders

    With over 80% of our work coming from repeat clients, we place great value on the relationships our people develop with our clients. We recognize that communication is the cornerstone of these relationships. So we listen. We become partners in our clients’ building successes.
  • 02

    National Feel, Local Presence

    Our family of companies is structured to benefit our clients with the stability of a strong bonding capacity and financial security and localized regional expertise. Our parent company, O’Neil Industries, is headquartered in Chicago with 12 operating units across six states.
  • 03

    Leadership Development

    We are committed to developing construction leaders of tomorrow. Our approach involves individual mentoring as well as practical, workshop-based trainings for growth in both technical and soft skills.
  • 04

    Leading Technology

    We consistently utilize state-of-the-art technology to improve communication with every member of the project team. From collaborative project management to virtual design and construction, our technology toolbox adds value to every project, resulting in improved efficiency in cost, quality, and schedule.
  • 05


    We have our roots in the trades, and we build on significant experience as construction managers on large, complex projects.
  • 06

    Special Projects

    Our Special Projects Group delivers outstanding expertise, attention, agility, and value for projects that typically take place in occupied spaces. We provide rapid execution and deep expertise, and we aim to create lasting relationships: servicing your facility through multiple projects.
  • 07


    Compliance with regulations is just a baseline, and great safety performance is never luck. It takes teamwork, discipline, focus, and coordination. We are committed to building a zero-injury mindset in our culture and on each of our jobsites.

Client Stories

We consider W.E. O’Neil to be a partner and one of our few ‘go-to’ contractors on a national basis. We plan to continue to use them and I highly recommend them. They repeatedly showed their willingness to be a partner and team player on each project. Their teams are very strong and were able to identify problems in advance to reduce costly change orders and delays. Whenever there were problems, as there always are in construction, W.E. O’Neil looked for solutions, not excuses. That reflects the quality of their people, who are among the most dedicated and qualified of any we have worked with.

Paul Chapman, Vice President (former)
Belmont Village

The most valuable service W.E. O’Neil Construction provided for us on this project was in how easy, responsive, and friendly they are to work with. It made problem solving so much more effective.

Erin Bagnall
Sopher Sparn Architects

No way did I expect this kind of success on a job. Pandemic? Rain? Tough Site? How about two months early and money back. This is one to remember and celebrate.

James Palda, Senior Director Real Estate Development
Steadfast Development

O’Neil is made up of a core group of dedicated and competent professionals, who, while moving forward using the latest and most innovative techniques available to successfully guide the completion of a project, do so in a caring and nurturing manner that is almost akin to a parent successfully raising a child. The fact that O’Neil is a employee-owned business is always evident, and it is what their success is rooted to. As DePaul looks forward to its continuing relationship with W.E. O’Neil we absolutely recommend their services to any potential client who has a desire to see its construction project completed on time, on budget, and at a level of quality that is unsurpassed.

Robert Janis, Vice President of Facility Operations
DePaul University

What specifically sets W.E. O’Neil apart from their competition is their team-oriented approach. They really care about the client.

Jonathan Power
Game Creek Holdings

From our first walk through with W.E. O’Neil’s construction supervisor to final delivery, their team was professional and executed beautifully. We were able to lease nearly 500 units in six months in large part due to W.E. O’Neil delivering an exceptional product on-time and in process. Their high quality delivery of the residential towers surpassed our expectations. W.E. O’Neil’s craftsmanship and efficiency at turnover was best-in-class. I look forward to working with them in the future.

Aaron Galvin
Luxury Living Chicago Realty