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 spaces. 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 the 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.
facebook reviews
"I’ve personally had work done by them, and the quality is unmatched. Everything was clean, perfectly integrated, and built to last. They treat your home or business like their own and make sure every detail is dialed in just right."
"Great guys, good prices and quickly responsive. Been using them for years and I would not choose any other!"