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.


Post Alarm Systems commercial installations cover the whole range of client needs for protection, from systems for small retail shops to complex, sophisticated systems for high-rise office buildings.  We pride ourselves in providing our client with the best technology available in the industry backed by expert system design, installation, service, UL monitoring and patrol services.  As your company grows and your needs change, Post’s ever-growing selection of security solutions enables us to work hand-in-hand with you to maintain a high level of security for your business for years to come.

“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

a personalized plan for your business needs.

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