ONeil Building Systems

For Custom Post-Frame Structures, Why O'Neil?

At O’Neil Building Systems, we don’t think you should have to settle for ‘basic’ just to save a little money. For over 50 years, as a family owned and operated company, we’ve been custom builders of high quality, post-frame structures for residential and commercial customers in Illinois, Missouri, and parts of the Midwest.

We approach each project as a blank canvas and a world of potential. Our talented staff includes design, construction, and engineering professionals who will work with you to create a structural plan that meets your needs, desires, and specifications – all within your budget.

The structural materials and components we use to create your building are of the highest quality from trusted, world-class manufacturing partners. They are also backed by some of the strongest warranties in the industry.

Our construction craftsmen – from the yardmen to the carpenters and foremen – all take pride in helping to create a building that you’ll own with confidence and satisfaction for years to come.

So whether you want a pole barn, a commercial building, a building for extra storage, or a home, we can meet your needs.

Did you Know?

O’Neil is a Capital Development Board approved builder. We’re an approved supplier for the state of Illinois with over 50 years of experience. Our Engineering Department can supply you sealed structural drawings if needed. We’ve got decades of experience satisfying municipality requirements and building codes throughout Illinois, Missouri, and parts of the Midwest.

Scroll to Top