O'Neil Metal Buildings and Roofing

O'Neil Metal Buildings and Roofing, operating as O'Neil Building Systems, builds custom post-frame and steel structures from Belleville, Illinois, serving the Belleville and St. Louis, Missouri region. The company reports 50 years in business and holds Capital Development Board approval.

Residential work includes barndominiums, pool houses, and equipment storage. The company also builds equestrian barns, warehouses, manufacturing facilities, hangars, and self-storage units, and sells steel and lumber wholesale. O'Neil positions itself as a premium builder and states plainly that it is not aimed at budget buyers seeking the fastest completion.

Specific construction standards are published on its site: posts set on concrete plates and fully encased in cement rather than in direct soil contact, 4 to 5 inch concrete floor slabs, 2-foot wall girt spacing, 26-gauge exterior panels with 40-year warranty paint, hand-nailed fastening in place of pneumatic tools, a hangar-style purlin system for wind resistance, and gutter aprons on every build. The process runs four steps: an initial call, an optional site visit, a detailed proposal, then construction. Financing options are available.

For barndominium buyers in the Metro East and greater St. Louis area, O'Neil publishes build specifications that are unusually concrete for this category.