Build your dream.
From Residential & Farm to Commercial, we can build the structure for your needs.
O’Neil Building Systems specializes in custom built post-frame structures. Our team will work with you on the design, engineering, and construction of your post-frame structure.
Lack of proper storage space for your needs can lead to clutter and disorganization.
The cost of renting a space to store your large equipment, animals, belongings or other toys can add up fast. Not properly storing certain items can lead to ruined or deteriorating condition and be even more costly.
We understand your needs
You have unique requirements, vision, & wants, and we can help build your dream space for all of it. We’ve been helping other people build their dreams for over 50 years, and we can do the same for you!
Do your dreams come in only one color or fit in a specific box? The answer is usually no. We approach every project the same way. We build a structure from the ground up, not using a "standard" design. If you can dream it, we can build it!
The O'Neil Build Plan
What Our Customers Say
Get the building space you need with the quality you deserve and a price you'll love.
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.