After nearly 45 years of dedicated ownership and a strong presence in Southeast Texas, the Thornhill family sold Southwest Building Systems (SBS) in May 2025. The new owners and operators, Greg and Sarah Rebello, are excited to carry forward the legacy of excellence while continuing to serve Southeast Texas with top-tier fire alarm, security, and access control services. Air Force veteran with ove
r 20 years of experience in the fire alarm industry. He holds a NICET Level IV certification, is APS licensed, and possesses numerous additional certifications and credentials. With his deep expertise in fire alarm and security system installation and service, Greg is committed to delivering high-quality, reliable solutions to SBS clients. Sarah Rebello brings a strong background in fire alarm design and business operations. She is a licensed fire alarm technician with several years of experience designing code-compliant fire alarm systems. A former high school business teacher with a background in business education, Sarah oversees SBS’s business operations and supports day-to-day management. Greg and Sarah are committed to upholding the values of integrity, quality, and customer service that SBS has been known for over the past five decades. Their top priority is to maintain and build upon the high standards of fire alarm and security service that the Southeast Texas community has come to trust.
