Trusted Name Since 1981
Contact Us

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 MISSION STATEMENT

Southwest Building Systems will be the leading service provider for fire alarm, security, communication & sound and audio/visual systems in the region. SBS will maintain a highly trained workforce to provide the highest quality design, installation, and inspection services for all of the systems which it sells. SBS is committed to the promotion, development, and encouragement of an ethical marketplace in the areas we serve.

SBS will train and maintain a sales and customer service team with a reputation for honesty, integrity, and courtesy second to none in the region. The reputation SBS holds for sound advertising, selling and customer service practices that enhance customer trust and confidence in business will be a hallmark of the company.

Consultation, Design, Installation, Sales and Service