Shields up.
Since 1956.

Founded by Sam Post over 60 years ago, Post Alarm is a family-run business committed to protecting our neighborhoods in Southern California.

Shield your home with the latest technology.

Expand coverage to your home and get a free trial of our Night Shield service.

Shields up.
Since 1956.

Founded by Sam Post over 60 years ago, Post Alarm is a family-run business committed to protecting our neighborhoods in Southern California.

Complete commercial, home security & alarm monitoring in Los Angeles, Orange County, and SoCal since 1956.

Residential Security

We've been in the security business for over 60 years and we've seen firsthand the happiness that comes when our clients feel safe in their homes. That's why we offer custom designed, interactive security solutions with leading technology and service.

Commercial Security

To protect your commercial business from theft, vandalism, or fire, our trained technicians will custom-design a system that uses cutting edge technology to manage all your security needs. We are here for you and your business all day, every day.

"We highly recommend Post Alarm to any homeowner considering an alarm system. The people, service, and products are second to none!"

D&M Weaver | Monrovia, CA
Clients Since 2009

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Secure peace of mind with the latest alarm

technology and local patrol service.

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