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O'Neil Building & Supply in Belleville, IL

Belleville, Illinois

(2 reviews)

(XXX) XXX-6100(number not published)Website not published

Last Updated: March 2, 2026

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About O'Neil Building & Supply

O'Neil Building & Supply, based in Belleville, Illinois, specializes in custom post-frame and steel structures for residential, farm, equestrian, and commercial applications. The company builds barndominiums, pool houses, equipment storages, equestrian barns, warehouses, manufacturing facilities, airplane hangars, and storage units. O'Neil also provides steel and lumber supply services. The builder's construction approach emphasizes concrete pad foundations for all posts, 2-foot wall girt spacing, and premium exterior metal paneling. The company has been in business for 50 years, holds an A+ rating, and is a Capital Development Board Approved Builder. O'Neil offers financing options and provides site visits upon request as part of their design and bidding process. The company supplies both steel framing and traditional lumber materials for projects of varying scales.