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.


Every business needs to safeguard its property, inventory, and employees, but Post Alarm Security Systems go far beyond these basics to provide your company with Interactive Business Solutions. Whether you’re a small business owner or in need of a system that protects multiple factories, offices, or thousands of employees, we have the tools and technology to meet your needs. Our security systems use cutting edge, encrypted technology, and allow you to manage your employees and business from any smart device, tablet or computer from anywhere in the world.  You can now easily arm/disarm the main system and partitions, receive notifications, change/add user codes and understand business activity trends from anywhere at any time.  All of this is backed by our UL Listed 5 Diamond Certified Monitoring Station 24/7.

With a Post Alarm Commercial Security System you can rest easy knowing we have your security needs covered 24/7.

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

- Brian

“Safety is ultimately up to you. The best you can do is harden the target. That’s what Post Alarm provides. They are a minute away. Post Alarm is a brand known and respected.”

- Glenn

“What I love most about Post Alarm is their ability to accommodate our business needs.”

- Tammy

“I’ve been a Post Alarm customer for over 40 years, and have never had a complaint or fault with any of their services.”

- Robert

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Our unique security analysis process provides

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