Trusted Name Since 1981
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P: (409) 385-3971

F: (409) 385-5550


809 Hwy 327 E Silsbee, Texas 77656

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In 1981 George E. and Betty L. Thornhill formed Southwest Building Systems as a sole proprietorship after selling the family Air stream travel trailer and many other assets to take the risk of going into business with an entrepreneurial mindset. George, until his passing in 1999, was completely involved in the

SBS company buildingSales and Management effort. Betty, until her passing in 2015, was the CEO responsible for auditing the Accounting, Finance, and daily operations. Today, after 36 years of business, our company is located at 809 Hwy 327 E. Silsbee, Texas

G. Thornhill Inc. dba Southwest Building Systems became incorporated in 1997 and is overseen by David M. Thornhill. David joined SBS after graduation from Lamar University with a business management degree and two years experience working in the banking industry. In 2006, with 25 years of electronic experience from the ground up, David was promoted by merit to President of SBS. In 2015 David became the CEO/President of SBS.
Brent Thornhill, the Third generation of this companyjoined the team in 2005 to work from the ground up until his graduation from Lamar Institute of Technology in 2008 with a Business Administration degree. Brent currently holds the Business Development Manager position as of 2014, and is excited to continue to propel SBS into the future.

SBS is currently composed of both full time and part time employees, that are over seen by a Board of Directors.


  • Safety is the first priority & responsibility for all SBS employees both on the job site & off.
  • Experience Modification Rating (EMR) is 0.083.
  • Company Drug & Alcohol program.
  • Management presents monthly Safety Training.
  • Employee wage increases & performance bonuses are based first upon safety performance record.

SBS mission statement image MISSION STATEMENT

Southwest Building Systems will strive to develop customer satisfaction and personal excellence in all departments of our company. We will listen to and understand what is required and needed as it relates to our customers and our fellow workers. Our excellence in work is a result of our ability to improve, learn and understand our products and abilities. We will be positive thinkers and will be open minded about our products and customers, always keeping the respect, trust and integrity intact.

We will communicate with each other and our customers to produce an atmosphere that is conductive to the environment of excellence. Together as a team, we will support the value of making a profit for our company so that we may continue to serve our customer base and help our financial position for the years ahead. We have created this document to guide us in our pursuit of excellence.

The success of our company will be measured by our level of commitment to these values.

Consultation, Design, Installation, Sales and Service