About Kirby Building Systems

Kirby Building Systems began in 1955 as a general contracting firm in Houston, TX. By 1959, the company began to sell and fabricate its own line of steel buildings under the name of Mes -Tex Steel Buildings, with all product produced out of the Houston, TX plant. The business grew steadily, and within two years, the company began to sell metal buildings on a regional basis. By 1964, a growing network of Authorized Builders had enabled the company to expand nationally. In 1966, the company was purchased by Kirby Industries, and was renamed Kirby Building Systems, Inc. Investment by the Kirby Industries parent company financed ongoing growth, and in October of 1973, a second plant was built in Portland, TN to support the shipment of product to the Eastern areas of the United States from its 32+ acre facility.

In August, 2007, Kirby Building Systems, Inc. was acquired by the Nucor Corporation and renamed to Kirby Building Systems, LLC. The company currently sells to a global network of Builders, which includes presence in 35 of the 50 United States, as well as Great Britain, Africa, South America, Mexico, Puerto Rico, and the Caribbean. Kirby is proud to be called a Nucor Company, part of a $16 Billion organization that is currently the 5th largest steel company in the world, and was named in 2006 as #1 Best Company on Forbes 50 List.

From its headquarters in Portland, TN, Kirby Building Systems ranks today as one of the top 10 manufacturers of metal buildings in the world, and is an industry-leading manufacturer of custom-engineered, high-quality and cost-effective metal building systems. With a tradition of excellence and industry experience dating back over 50 years, Kirby’s quality products include complete framing systems, wall and roof panel systems, and extended bay options – all engineered and manufactured by Kirby employees.

Today, Kirby Building Systems, LLC (USA) employs over 240 people at its 260,000+ square foot manufacturing and office facility in Portland, TN. Over 70% of Kirby’s employees have been with the company for at least 5 years, 41% have over 15 years of service, and a remarkable 26% of the employees have over 25 years of service. Kirby’s customers and employees alike are proud of the company, its products, and the level of service that Kirby provides today’s global construction.


For outstanding achievement in the prevention of on-the-job accidents, Nucor created the President's Safety Award. The criteria for winning are tough. Nucor divisions are compared to similar facilities at other companies around the nation. For a Nucor division to earn an annual President's Safety Award, it must post lost workday and injury/illness rates that are 67% lower than the national average.

U.S.A. Made

Kirby is a proud U.S.A. company manufacturing metal buildings.

  • Made from American Steel
  • Designed and Detailed in America
  • Fabricated in America.