Reliable.
friendly.
trusting.
G&J Customized Security Systems LLC is a low-voltage security system installation company in Carroll County Maryland, specializing in residential and commercial environments. G&J was founded in 1992 by Gregg Olsen and James Wheeler, who serve as both the owners and the primary sellers and installers. This unique business model is a key reason why G&J is known for our exceptional customer service, from the initial sale to installation and ongoing customer support.
We pride ourselves on being reliable, friendly, and trustworthy partners. Approximately 80% of our business comes from referrals and word-of-mouth marketing, indicating that our customers confidently recommend G&J to their friends, family, and business associates.