Denis Cooke

Established in 1952, All-Guard Alarm Systems, Inc. (All-Guard) has protected the homes and businesses of Northern California for over 65 years. Based in Livermore, California, All-Guard has grown to be one of the largest family-owned and operated electronic security companies in California. Offering only the best and latest technology available in the industry, All-Guard presents a wide variety of security solutions that satisfy our residential and commercial customers’ needs. These services include: • Full-facility intrusion alarm monitoring • Fire alarm monitoring • Electronic access control • Video surveillance installation and monitoring • UL-Certified 24/7 Monitoring division All-Guard services are supported by dedicated technicians who are trained, certified, licensed and committed to providing the highest levels of service. All-Guard – At Work. At Home. At Ease.